{"id":13961,"date":"2021-08-17T17:45:17","date_gmt":"2021-08-17T17:45:17","guid":{"rendered":"https:\/\/freehost.page\/?p=13961"},"modified":"2021-08-17T17:45:17","modified_gmt":"2021-08-17T17:45:17","slug":"xu-ly-them-ngay-thang-nam","status":"publish","type":"post","link":"https:\/\/kiencang.net\/xu-ly-them-ngay-thang-nam\/","title":{"rendered":"N\u1ebfu \u0111\u00e3 bi\u1ebft c\u1ea5u tr\u00fac d\u1eef li\u1ec7u c\u1ee7a ng\u00e0y th\u00e1ng n\u0103m sinh, ch\u00fang ta c\u00f3 th\u1ec3 x\u1eed l\u00fd th\u00eam g\u00ec n\u1eefa"},"content":{"rendered":"\n<p>Trong b\u00e0i vi\u1ebft tr\u01b0\u1edbc, t\u00f4i \u0111\u00e3 vi\u1ebft 2 h\u00e0m x\u1eed l\u00fd ng\u00e0y th\u00e1ng n\u0103m d\u1ea1ng th\u00f4. N\u00f3 c\u00f3 t\u00e1c d\u1ee5ng r\u1ea5t t\u1ed1t trong vi\u1ec7c th\u1ed1ng k\u00ea t\u1ed5ng th\u1ec3 d\u1eef li\u1ec7u c\u1ee7a ch\u00fang ta. <a href=\"https:\/\/kiencang.net\/phan-tich-du-lieu-ngay-thang-nam\/\" target=\"_blank\" rel=\"noreferrer noopener\">Cho ta bi\u1ebft c\u1ea5u tr\u00fac d\u1eef li\u1ec7u ch\u1ee7 y\u1ebfu c\u1ee7a n\u00f3, c\u0169ng nh\u01b0 xu\u1ea5t ra c\u00e1c d\u1eef li\u1ec7u kh\u00f4ng h\u1ee3p chu\u1ea9n<\/a>.<\/p>\n\n\n\n<p>B\u00e2y gi\u1edd c\u00e2u h\u1ecfi l\u00e0: gi\u1ea3 s\u1eed ch\u00fang ta bi\u1ebft \u0111\u01b0\u1ee3c c\u1ea5u tr\u00fac d\u1eef li\u1ec7u c\u1ee7a ng\u00e0y th\u00e1ng n\u0103m r\u1ed3i, ch\u00fang ta n\u00ean l\u00e0m g\u00ec ti\u1ebfp?<\/p>\n\n\n\n<p>C\u00f3 m\u1ea5y v\u1ea5n \u0111\u1ec1:<\/p>\n\n\n\n<ul><li>\u0110\u1ed1i x\u1eed th\u1ebf n\u00e0o v\u1edbi d\u1eef li\u1ec7u sai?<\/li><li>\u0110\u1ed1i x\u1eed th\u1ebf n\u00e0o v\u1edbi d\u1eef li\u1ec7u kh\u00e1c chu\u1ea9n?<\/li><li>D\u1eef li\u1ec7u \u0111\u00e3 kh\u1edbp r\u1ed3i nh\u01b0ng mu\u1ed1n chu\u1ea9n h\u00f3a th\u00eam n\u1eefa th\u00ec l\u00e0m nh\u1eefng g\u00ec?<\/li><\/ul>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_60 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >M\u1ee5c l\u1ee5c<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\" role=\"button\"><label for=\"item-6577d6ec0c358\" ><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input aria-label=\"Toggle\" aria-label=\"item-6577d6ec0c358\"  type=\"checkbox\" id=\"item-6577d6ec0c358\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/kiencang.net\/xu-ly-them-ngay-thang-nam\/#Xu_ly_the_nao_voi_du_lieu_sai\" title=\"X\u1eed l\u00fd th\u1ebf n\u00e0o v\u1edbi d\u1eef li\u1ec7u sai?\">X\u1eed l\u00fd th\u1ebf n\u00e0o v\u1edbi d\u1eef li\u1ec7u sai?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/kiencang.net\/xu-ly-them-ngay-thang-nam\/#Lam_gi_voi_du_lieu_khac_chuan\" title=\"L\u00e0m g\u00ec v\u1edbi d\u1eef li\u1ec7u kh\u00e1c chu\u1ea9n?\">L\u00e0m g\u00ec v\u1edbi d\u1eef li\u1ec7u kh\u00e1c chu\u1ea9n?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/kiencang.net\/xu-ly-them-ngay-thang-nam\/#Chuan_hoa_tiep_du_lieu_da_khop_nhu_the_nao\" title=\"Chu\u1ea9n h\u00f3a ti\u1ebfp d\u1eef li\u1ec7u \u0111\u00e3 kh\u1edbp nh\u01b0 th\u1ebf n\u00e0o?\">Chu\u1ea9n h\u00f3a ti\u1ebfp d\u1eef li\u1ec7u \u0111\u00e3 kh\u1edbp nh\u01b0 th\u1ebf n\u00e0o?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/kiencang.net\/xu-ly-them-ngay-thang-nam\/#Bay_gio_se_den_cac_doan_ma_xu_ly\" title=\"B\u00e2y gi\u1edd s\u1ebd \u0111\u1ebfn c\u00e1c \u0111o\u1ea1n m\u00e3 x\u1eed l\u00fd\">B\u00e2y gi\u1edd s\u1ebd \u0111\u1ebfn c\u00e1c \u0111o\u1ea1n m\u00e3 x\u1eed l\u00fd<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/kiencang.net\/xu-ly-them-ngay-thang-nam\/#Nang_cao_chuc_nang_cua_ham\" title=\"N\u00e2ng cao ch\u1ee9c n\u0103ng c\u1ee7a h\u00e0m\">N\u00e2ng cao ch\u1ee9c n\u0103ng c\u1ee7a h\u00e0m<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Xu_ly_the_nao_voi_du_lieu_sai\"><\/span>X\u1eed l\u00fd th\u1ebf n\u00e0o v\u1edbi d\u1eef li\u1ec7u sai?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>D\u1eef li\u1ec7u ng\u00e0y th\u00e1ng sai, thi\u1ebfu c\u00f3 th\u1ec3 l\u00e0:<\/p>\n\n\n\n<ul><li><strong>R\u1ed7ng ho\u00e0n to\u00e0n<\/strong>, ch\u00fang ta ch\u1eb3ng th\u1ec3 l\u00e0m g\u00ec v\u1edbi d\u1eef li\u1ec7u n\u00e0y, ngo\u00e0i vi\u1ec7c \u0111\u00e1nh d\u1ea5u l\u1ed7i n\u00f3 \u0111\u1ec3 c\u00e1c th\u1ed1ng k\u00ea li\u00ean quan \u0111\u1ebfn ng\u00e0y th\u00e1ng n\u0103m kh\u00f4ng l\u00f4i n\u00f3 v\u00e0o t\u00ednh to\u00e1n (x\u00f3a d\u1eef li\u1ec7u, k\u1ec3 c\u1ea3 d\u1eef li\u1ec7u l\u1ed7i l\u00e0 \u0111i\u1ec1u n\u00ean tr\u00e1nh, v\u00ec c\u00e1c c\u1ed9t kh\u00e1c c\u00f3 th\u1ec3 d\u00f9ng \u0111\u01b0\u1ee3c, v\u00e0 d\u1eef li\u1ec7u l\u1ed7i l\u00e0 m\u1eabu t\u1ed1t trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p \u0111\u1ec1 xu\u1ea5t gi\u1ea3i ph\u00e1p ch\u1ec9nh s\u1eeda);<\/li><li><strong>D\u1eef li\u1ec7u thi\u1ebfu<\/strong>, v\u00ed d\u1ee5 ch\u1ec9 c\u00f3 ng\u00e0y\/th\u00e1ng ho\u1eb7c th\u00e1ng\/n\u0103m, t\u1ee9c l\u00e0 ch\u1ec9 c\u00f3 2 d\u1eef li\u1ec7u tr\u00ean t\u1ed5ng s\u1ed1 3 d\u1eef li\u1ec7u ti\u00eau chu\u1ea9n. Nh\u00ecn chung vi\u1ec7c s\u1eeda d\u1eef li\u1ec7u n\u00e0y t\u01b0\u01a1ng \u0111\u1ed1i nguy hi\u1ec3m, b\u1edfi r\u1ea5t kh\u00f3 ch\u1eafc ch\u1eafn, v\u00e0 ph\u1ea7n l\u1edbn tr\u01b0\u1eddng h\u1ee3p ch\u00fang ta c\u0169ng n\u00ean \u0111\u00e1nh d\u1ea5u l\u1ed7i \u0111\u1ec3 kh\u00f4ng \u0111\u01b0a v\u00e0o th\u1ed1ng k\u00ea n\u1ebfu s\u1ed1 l\u01b0\u1ee3ng d\u1eef li\u1ec7u n\u00e0y kh\u00f4ng qu\u00e1 l\u1edbn (n\u1ebfu l\u01b0\u1ee3ng l\u1edbn d\u1eef li\u1ec7u b\u1ecb thi\u1ebfu h\u1ee5t th\u00f4ng tin, c\u00f3 th\u1ec3 ch\u00fang ta s\u1ebd ph\u1ea3i \u0111i\u1ec1u ch\u1ec9nh l\u1ea1i c\u00e1ch th\u1ee9c th\u1ed1ng k\u00ea, ch\u1eafc ch\u1eafn n\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 tin c\u1eady c\u1ee7a k\u1ebft lu\u1eadn). \u0110\u00f4i khi d\u1eef li\u1ec7u n\u00e0y c\u00f3 th\u1ec3 s\u1eeda \u0111\u01b0\u1ee3c, nh\u01b0ng c\u0169ng th\u01b0\u1eddng l\u00e0 \u01b0\u1edbc t\u00ednh kho\u1ea3ng \u0111\u01b0\u1ee3c th\u00f4i. V\u00ed d\u1ee5 m\u1ed9t sinh vi\u00ean trong m\u1ed9t l\u1edbp th\u00ec c\u00f3 th\u1ec3 \u0111o\u00e1n \u0111\u01b0\u1ee3c kh\u00e1 ch\u1eafc l\u00e0 n\u0103m sinh c\u1ee7a ng\u01b0\u1eddi \u0111\u00f3 n\u1eb1m trong <strong>kho\u1ea3ng x\u00ea d\u1ecbch<\/strong> v\u00e0i n\u0103m so v\u1edbi n\u0103m sinh c\u1ee7a c\u00e1c b\u1ea1n c\u00f9ng l\u1edbp m\u00e0 ch\u00fang ta c\u00f3;<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Lam_gi_voi_du_lieu_khac_chuan\"><\/span>L\u00e0m g\u00ec v\u1edbi d\u1eef li\u1ec7u kh\u00e1c chu\u1ea9n?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>D\u1eef li\u1ec7u kh\u00e1c chu\u1ea9n v\u1edbi t\u1ef7 l\u1ec7 r\u1ea5t nh\u1ecf khi m\u00e0 ch\u00fang ta l\u1ea5y t\u1eeb m\u1ed9t ngu\u1ed3n t\u01b0\u01a1ng \u0111\u1ed1i \u1ed5n \u0111\u1ecbnh c\u00f3 th\u1ec3 c\u00f3 2 l\u1ef1a ch\u1ecdn:<\/p>\n\n\n\n<ul><li><strong>B\u1ea1n lo\u1ea1i tr\u1eeb n\u00f3<\/strong>, v\u00ec n\u00f3 c\u0169ng kh\u00f4ng \u1ea3nh h\u01b0\u1edfng g\u00ec \u0111\u00e1ng k\u1ec3 \u0111\u1ebfn k\u1ebft qu\u1ea3 th\u1ed1ng k\u00ea t\u1ed5ng th\u1ec3 cu\u1ed1i c\u00f9ng, v\u00ec l\u01b0\u1ee3ng d\u1eef li\u1ec7u c\u1ee7a n\u00f3 r\u1ea5t nh\u1ecf;<\/li><li>L\u01b0\u1ee3ng d\u1eef li\u1ec7u r\u1ea5t nh\u1ecf sai l\u1ec7ch c\u0169ng th\u01b0\u1eddng do l\u1ed7i nhi\u1ec1u h\u01a1n, ch\u1ee9 kh\u00f4ng ph\u1ea3i do c\u1ea5u tr\u00fac l\u1ef1a ch\u1ecdn ch\u1ee7 \u0111\u1ed9ng. N\u1ebfu kh\u00f4ng ch\u1eafc ch\u1eafn, d\u0129 nhi\u00ean ch\u00fang ta n\u00ean b\u1ecf kh\u00f4ng \u0111\u01b0a n\u00f3 v\u00e0o t\u00ednh to\u00e1n;<\/li><\/ul>\n\n\n\n<p>N\u1ebfu d\u1eef li\u1ec7u kh\u00e1c chu\u1ea9n c\u00f3 t\u1ef7 l\u1ec7 l\u1edbn, kh\u1ea3 n\u0103ng cao \u0111\u1ea5y l\u00e0 s\u1ef1 l\u1ef1a ch\u1ecdn ch\u1ee7 \u0111\u1ed9ng c\u1ee7a ng\u01b0\u1eddi nh\u1eadp li\u1ec7u, ch\u00fang ta s\u1ebd ph\u1ea3i so\u00e1t l\u1ea1i d\u1eef li\u1ec7u \u0111\u1ec3 ch\u1eafc ch\u1eafn v\u1ec1 \u0111i\u1ec1u n\u00e0y. D\u1eef li\u1ec7u kh\u00e1c chu\u1ea9n chi\u1ebfm t\u1ef7 l\u1ec7 cao n\u00f3 s\u1ebd \u0111i theo nh\u00f3m d\u1eef li\u1ec7u m\u00e0 ch\u00fang ta thu th\u1eadp, ch\u1ee9 s\u1ebd kh\u00f4ng ph\u1ea3i d\u1ea1ng h\u00e0ng 1 th\u00ec ki\u1ec3u A, c\u00f2n h\u00e0ng 2 th\u00ec ki\u1ec3u B \u0111\u1ea3o qua \u0111\u1ea3o l\u1ea1i. <\/p>\n\n\n\n<p>Khi ch\u1eafc ch\u1eafn ch\u00fang ta s\u1ebd thay \u0111\u1ed5i c\u1ea5u tr\u00fac c\u1ee7a n\u00f3 v\u1ec1 d\u1ea1ng ti\u00eau chu\u1ea9n.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Chuan_hoa_tiep_du_lieu_da_khop_nhu_the_nao\"><\/span>Chu\u1ea9n h\u00f3a ti\u1ebfp d\u1eef li\u1ec7u \u0111\u00e3 kh\u1edbp nh\u01b0 th\u1ebf n\u00e0o?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Chu\u1ea9n h\u00f3a d\u1eef li\u1ec7u nh\u01b0 ki\u1ec3u ch\u00fang ta l\u1ecdc n\u01b0\u1edbc v\u1eady, n\u00f3 c\u00f3 nhi\u1ec1u l\u1edbp- n\u00e0o c\u00e1t, n\u00e0o s\u1ecfi, n\u00e0o than.<\/p>\n\n\n\n<p>C\u00e0ng can thi\u1ec7p chu\u1ea9n x\u00e1c, vi\u1ec7c th\u1ed1ng k\u00ea c\u1ee7a ch\u00fang ta s\u1ebd c\u00e0ng ch\u00ednh x\u00e1c v\u00e0 \u0111\u01a1n gi\u1ea3n h\u01a1n sau n\u00e0y.<\/p>\n\n\n\n<p>D\u1eef li\u1ec7u ng\u00e0y th\u00e1ng n\u0103m n\u1ebfu \u0111\u00e3 chu\u1ea9n h\u00f3a b\u01b0\u1edbc m\u1ed9t theo th\u1ee9 t\u1ef1 nh\u01b0 v\u1eady, c\u00f2n m\u1ea5y \u0111i\u1ec1u sau ch\u00fang ta c\u1ea7n \u0111\u1ec3 \u00fd:<\/p>\n\n\n\n<ul><li><strong>Th\u1ed1ng nh\u1ea5t s\u1ed1 0 c\u00f3 \u0111\u1ee9ng \u0111\u1eb1ng tr\u01b0\u1edbc gi\u00e1 tr\u1ecb d\u01b0\u1edbi 10 hay kh\u00f4ng<\/strong>, t\u1ee9c l\u00e0 ch\u1ecdn <code>05\/07\/2015<\/code> hay <code>5\/7\/2015<\/code>?<\/li><li>Tr\u01b0\u1edbc t\u00f4i t\u1eebng th\u00edch ki\u1ec3u <code>5\/7\/2015<\/code> h\u01a1n, nh\u01b0ng ngh\u0129 l\u1ea1i th\u00ec ki\u1ec3u c\u00f3 s\u1ed1 0 \u0111\u1eb1ng tr\u01b0\u1edbc m\u1edbi th\u1ef1c s\u1ef1 hay h\u01a1n, n\u1ebfu th\u00f3i quen \u0111\u00f3 \u0111\u01b0\u1ee3c duy tr\u00ec n\u00f3 s\u1ebd <strong>h\u1ea1n ch\u1ebf t\u1ed1i \u0111a l\u1ed7i nh\u1eadp li\u1ec7u<\/strong>. Vi\u1ec7c t\u00e1ch s\u1ed1 l\u1ea5y d\u1eef li\u1ec7u v\u1edbi ng\u00e0y th\u00e1ng c\u00f3 s\u1ed1 0 \u0111\u1eb1ng tr\u01b0\u1edbc c\u0169ng r\u1ea5t \u0111\u01a1n gi\u1ea3n;<\/li><li>Ch\u00fang ta th\u00edch \u0111\u1ec3 <strong>ki\u1ec3u d\u1eef li\u1ec7u n\u0103m l\u00e0 2 s\u1ed1 hay 4 s\u1ed1<\/strong>? C\u00e1 nh\u00e2n t\u00f4i th\u00edch 4 s\u1ed1 v\u00ec d\u1eef li\u1ec7u r\u00f5 r\u00e0ng h\u01a1n. Trong b\u00e0i vi\u1ebft n\u00e0y ch\u00fang ta c\u0169ng s\u1ebd vi\u1ebft m\u00e3 \u0111\u1ec3 \u0111i\u1ec1u ch\u1ec9nh vi\u1ec7c n\u00e0y;<\/li><li>N\u0103m sinh l\u00e0 gi\u00e1 tr\u1ecb m\u00e0 ch\u00fang ta c\u00f3 nhi\u1ec1u c\u00e1i \u0111\u1ec3 x\u1eed l\u00fd. Th\u01b0\u1eddng n\u0103m sinh s\u1ebd ch\u1ec9 <strong>n\u1eb1m trong m\u1ed9t kho\u1ea3ng h\u1ee3p l\u1ec7 nh\u1ea5t \u0111\u1ecbnh<\/strong>. V\u00ed d\u1ee5 h\u1ecdc sinh l\u1edbp m\u1ed9t s\u1ebd hi\u1ebfm c\u00f3 d\u1eef li\u1ec7u n\u0103m sinh tr\u01b0\u1edbc n\u0103m 2013 (n\u0103m t\u00f4i vi\u1ebft b\u00e0i n\u00e0y l\u00e0 2021, t\u1ee9c l\u00e0 sinh n\u0103m 2013 \u0111\u00e3 l\u00e0 8 tu\u1ed5i r\u1ed3i, s\u1ebd r\u1ea5t \u00edt tr\u01b0\u1eddng h\u1ee3p 8 tu\u1ed5i \u0111\u1ed5 l\u00ean h\u1ecdc l\u1edbp 1). M\u1ed9t v\u00ed d\u1ee5 kh\u00e1c, n\u0103m sinh c\u1ee7a ng\u01b0\u1eddi s\u1ed1ng s\u1ebd kh\u00f4ng th\u1ec3 s\u1edbm h\u01a1n 1900 \u0111\u01b0\u1ee3c, th\u1eadm ch\u00ed l\u00e0 kh\u00f3 s\u1edbm h\u01a1n 1920. N\u0103m sinh c\u1ee7a b\u1ea5t k\u1ef3 ai c\u0169ng kh\u00f4ng th\u1ec3 h\u01a1n n\u0103m \u1edf th\u1eddi \u0111i\u1ec3m hi\u1ec7n t\u1ea1i \u0111\u01b0\u1ee3c (v\u00ed d\u1ee5 n\u0103m nay l\u00e0 n\u0103m 2021 th\u00ec kh\u00f4ng th\u1ec3 c\u00f3 n\u0103m sinh c\u1ee7a ai \u0111\u00f3 \u0111\u00e3 sinh kh\u1ecfi b\u1ee5ng m\u1eb9 m\u00e0 l\u00e0 n\u0103m 2022 \u0111\u01b0\u1ee3c, d\u1ef1 sinh th\u00ec OK!)<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Bay_gio_se_den_cac_doan_ma_xu_ly\"><\/span>B\u00e2y gi\u1edd s\u1ebd \u0111\u1ebfn c\u00e1c \u0111o\u1ea1n m\u00e3 x\u1eed l\u00fd<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u0110o\u1ea1n m\u00e3 d\u01b0\u1edbi \u0111\u00e2y s\u1ebd x\u1eed l\u00fd t\u1ed5ng th\u1ec3 c\u00e1c l\u1ed7i li\u00ean quan \u0111\u1ebfn ng\u00e0y th\u00e1ng n\u0103m, trong th\u1ef1c t\u1ebf, m\u00e3 c\u00f3 th\u1ec3 \u0111\u01a1n gi\u1ea3n h\u01a1n t\u01b0\u01a1ng \u0111\u1ed1i nhi\u1ec1u, v\u00ec d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng n\u0103m \u0111\u01b0\u1ee3c nh\u1eadp li\u1ec7u t\u01b0\u01a1ng \u0111\u1ed1i ch\u00ednh x\u00e1c, c\u00f3 l\u1ebd l\u00e0 nh\u1edd c\u00e1c c\u00f4ng c\u1ee5 b\u1ea3ng t\u00ednh nh\u01b0 Excel ho\u1eb7c c\u00e1c b\u1ea3ng t\u00ednh tr\u1ef1c tuy\u1ebfn t\u01b0\u01a1ng t\u1ef1.<\/p>\n\n\n\n<p>\u1ede \u0111\u00e2y ch\u00fang ta c\u0169ng s\u1ebd vi\u1ebft h\u00e0m \u0111\u1ec3 ti\u1ec7n g\u1ecdi khi c\u1ea7n.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function chuan_hoa_ntn($nscu) {}\/\/h\u00e0m l\u1ea5y bi\u1ebfn \u0111\u1ea7u v\u00e0o l\u00e0 n\u0103m sinh c\u1ea7n chu\u1ea9n h\u00f3a $nscu<\/code><\/pre>\n\n\n\n<p>Ti\u1ebfp \u0111\u1ebfn ch\u00fang ta lo\u1ea1i b\u1ecf kho\u1ea3ng tr\u1eafng tr\u01b0\u1edbc v\u00e0 trong d\u1eef li\u1ec7u, c\u00e1i n\u00e0y \u0111\u1ec3 ph\u00f2ng xa, nhi\u1ec1u d\u1eef li\u1ec7u kh\u00f4ng b\u1ecb l\u1ed7i n\u00e0y:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$nscu1 = trim($nscu, ' '); \/\/ lo\u1ea1i b\u1ecf kho\u1ea3ng tr\u1eafng tr\u01b0\u1edbc v\u00e0 sau chu\u1ed7i\n\n$nscu2 = preg_replace('\/\\s+\/', ' ', $nscu1); \/\/ lo\u1ea1i b\u1ecf kho\u1ea3ng tr\u1eafng th\u1eeba \u1edf gi\u1eefa chu\u1ed7i<\/code><\/pre>\n\n\n\n<p>H\u00e0m <code>preg_replace<\/code> li\u00ean quan \u0111\u1ebfn <a href=\"https:\/\/kiencang.net\/cu-phap-co-ban-regex\/\" target=\"_blank\" rel=\"noreferrer noopener\">bi\u1ec3u th\u1ee9c ch\u00ednh quy (regex)<\/a> trong PHP (regex \u0111\u01b0\u1ee3c r\u1ea5t nhi\u1ec1u ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh h\u1ed7 tr\u1ee3, d\u00f9 kh\u00f4ng th\u1ed1ng nh\u1ea5t 100%, r\u1ea5t nhi\u1ec1u m\u00e3 l\u00e0 t\u01b0\u01a1ng t\u1ef1 nhau, ngh\u0129a l\u00e0 b\u1ea1n c\u00f3 th\u1ec3 d\u00f9ng n\u00f3 trong nhi\u1ec1u ng\u00f4n ng\u1eef kh\u00e1c nhau m\u00e0 kh\u00f4ng ph\u1ea3i h\u1ecdc l\u1ea1i t\u1eeb \u0111\u1ea7u). \u0110\u00e2y l\u00e0 c\u00f4ng c\u1ee5 r\u1ea5t m\u1ea1nh \u0111\u1ec3 x\u1eed l\u00fd chu\u1ed7i, c\u00e1c b\u1ea1n n\u00e0o ch\u01b0a bi\u1ebft n\u00ean th\u1eed t\u00ecm hi\u1ec3u&#8230;<\/p>\n\n\n\n<p>C\u0169ng \u0111\u1ec3 ph\u00f2ng xa, ch\u00fang ta ti\u1ebfn h\u00e0nh lo\u1ea1i b\u1ecf c\u00e1c k\u00fd t\u1ef1 kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e9p trong chu\u1ed7i ng\u00e0y th\u00e1ng, l\u1ed7i n\u00e0y c\u0169ng \u00edt g\u1eb7p, v\u00e0 tr\u01b0\u1edbc khi th\u1ef1c hi\u1ec7n ch\u00fang ta ph\u1ea3i quan s\u00e1t tr\u01b0\u1edbc c\u00e1c d\u1eef li\u1ec7u \u0111\u1ec3 bi\u1ebft r\u1eb1ng l\u00e0m nh\u01b0 v\u1eady th\u00ec vi\u1ec7c lo\u1ea1i b\u1ecf c\u00f3 \u0111\u00fang hay kh\u00f4ng (ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 chuy\u1ec3n m\u1ed9t ki\u1ec3u sai n\u00e0y sang m\u1ed9t ki\u1ec3u sai kh\u00e1c), gi\u1ea3 \u0111\u1ecbnh l\u00e0 \u0111\u01b0\u1ee3c ph\u00e9p th\u00ec m\u00e3 l\u1ec7nh s\u1ebd th\u1ebf n\u00e0y:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$ktdu = array('~', '!', '@', '#','$', '%', '^', '&amp;', '*', '(', ')', '_', '=', '+', '&#91;', '{', ']', '}', '|', ':', ';', '\"', ',', '&lt;', '>', '?', '+', '\\\\', '\\''); \/\/ k\u00fd t\u1ef1 d\u01b0 l\u1ed7i\n\n$nscu3 = str_replace($ktdu, \"\", $nscu2); \/\/ c\u00e2u l\u1ec7nh lo\u1ea1i b\u1ecf k\u00fd t\u1ef1 d\u01b0<\/code><\/pre>\n\n\n\n<p>M\u00e3 ti\u1ebfp theo ch\u00fang ta s\u1ebd <strong>th\u1ed1ng nh\u1ea5t<\/strong> c\u00e1c k\u00fd t\u1ef1 ph\u00e2n c\u00e1ch ng\u00e0y th\u00e1ng n\u0103m v\u1ec1 c\u00f9ng m\u1ed9t ki\u1ec3u. C\u1ee5 th\u1ec3 t\u00f4i s\u1ebd chuy\u1ec3n c\u00e1c k\u00fd t\u1ef1 ph\u00e2n c\u00e1ch l\u00e0 d\u1ea5u g\u1ea1ch ngang <code>-<\/code> v\u00e0 d\u1ea5u <code>.<\/code> v\u1ec1 d\u1ea5u g\u1ea1ch xu\u00f4i <code>\/<\/code><\/p>\n\n\n\n<p>\u0110o\u1ea1n m\u00e3 c\u1ee5 th\u1ec3 nh\u01b0 th\u1ebf n\u00e0y:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\n$nscu4 = preg_replace('\/\\.\/', '\/', $nscu3); \/\/thay d\u1ea5u ch\u1ea5m\n$nscu5 = preg_replace('\/-\/', '\/', $nscu4); \/\/thay d\u1ea5u g\u1ea1ch ngang<\/code><\/pre>\n\n\n\n<p>V\u00ec k\u1ebft h\u1ee3p c\u1ea3 hai d\u1ea5u kh\u00f4ng \u0111\u01b0\u1ee3c n\u00ean t\u00f4i t\u00e1ch ri\u00eang, b\u1ea1n ch\u00fa \u00fd d\u1ea5u ch\u1ea5m l\u00e0 m\u1ed9t k\u00fd t\u1ef1 \u0111\u1ea1i di\u1ec7n \u0111\u00e3 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong regex n\u00ean \u0111\u1ec3 d\u00f9ng n\u00f3 nh\u01b0 m\u1ed9t k\u00fd hi\u1ec7u b\u00ecnh th\u01b0\u1eddng ch\u00fang ta c\u1ea7n th\u00eam d\u1ea5u g\u1ea1ch ng\u01b0\u1ee3c <code>\\<\/code><\/p>\n\n\n\n<p>Ph\u1ea7n ti\u1ebfp theo ch\u00fang ta s\u1ebd d\u00f9ng Regex \u0111\u1ec3 thi\u1ebft l\u1eadp v\u00e0 l\u1ea5y m\u1eabu ng\u00e0y\/th\u00e1ng\/n\u0103m ti\u00eau chu\u1ea9n, \u1edf \u0111\u00e2y t\u00f4i s\u1ebd b\u1eaft ch\u1eb7t h\u01a1n th\u00f4ng th\u01b0\u1eddng, v\u00ec \u0111\u00e2y l\u00e0 n\u0103m sinh c\u1ee7a ng\u01b0\u1eddi trong kho\u1ea3ng th\u1eddi gian nhi\u1ec1u nh\u1ea5t l\u00e0 t\u1eeb \u0111\u1ea7u th\u1ebf k\u1ef7 19 cho \u0111\u1ebfn th\u1eddi \u0111i\u1ec3m hi\u1ec7n t\u1ea1i:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$rea = '\/^(0?&#91;1-9]|&#91;12]\\d|3&#91;01])&#91;\\\/](0?&#91;1-9]|&#91;1]&#91;012])&#91;\\\/](\\d{2}|19\\d{2}|20&#91;012]\\d)$\/'; \/\/ n\u0103m ch\u1ec9 h\u1ee3p l\u1ec7 t\u1eeb 1900 \u0111\u1ebfn 2029\n\n$kq=preg_match($rea, $nscu3, $match); \/\/ ki\u1ec3m tra xem c\u00f3 kh\u1edbp v\u1edbi m\u1eabu chu\u1ea9n hay ch\u01b0a<\/code><\/pre>\n\n\n\n<p>M\u1ea3ng <code>$match<\/code> s\u1ebd l\u01b0u k\u1ebft qu\u1ea3 n\u1ebfu kh\u1edbp. Trong \u0111\u00f3:<\/p>\n\n\n\n<ul><li><code>$match[0]<\/code> l\u00e0 c\u1ea3 chu\u1ed7i ng\u00e0y th\u00e1ng n\u0103m;<\/li><li><code>$match[1]<\/code> l\u00e0 ng\u00e0y;<\/li><li><code>$match[2]<\/code> l\u00e0 th\u00e1ng;<\/li><li><code>$match[3]<\/code> l\u00e0 n\u0103m;<\/li><li>N\u1ebfu kh\u1edbp th\u00ec gi\u00e1 tr\u1ecb <code>$kq<\/code> s\u1ebd b\u1eb1ng 1, c\u00f2n kh\u00f4ng n\u00f3 s\u1ebd b\u1eb1ng 0;<\/li><\/ul>\n\n\n\n<p>Gi\u1edd ch\u00fang ta s\u1ebd ki\u1ec3m tra nh\u1eefng th\u00e0nh ph\u1ea7n th\u00e1ng ho\u1eb7c ng\u00e0y n\u00e0o d\u01b0\u1edbi 10 m\u00e0 \u1edf d\u1ea1ng m\u1ed9t s\u1ed1 ta s\u1ebd th\u00eam <code>0<\/code> v\u00e0o \u0111\u1ec3 th\u00e0nh ki\u1ec3u nh\u01b0 <code>05\/07\/2015<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>if($kq==1) {\n                $mn=$match&#91;1]; \/\/ l\u1ea5y th\u00f4ng tin ng\u00e0y\n                $s_mn=(int)$mn; \/\/ chuy\u1ec3n n\u00f3 sang gi\u00e1 tr\u1ecb s\u1ed1\n                if (mb_strlen($s_mn)==1) {$mn2=\"0\".$s_mn;} else {$mn2=$mn;} \n                \n}<\/code><\/pre>\n\n\n\n<p>H\u00e0m <code>mb_strlen()<\/code> gi\u00fap ch\u00fang ta \u0111\u1ebfm s\u1ed1 k\u00fd t\u1ef1 trong chu\u1ed7i. Sau khi chuy\u1ec3n \u0111\u1ed5i sang d\u1ea1ng s\u1ed1, m\u00e0 s\u1ed1 l\u01b0\u1ee3ng k\u00fd t\u1ef1 ch\u1ec9 l\u00e0 1, ch\u00fang ta hi\u1ec3u r\u1eb1ng gi\u00e1 tr\u1ecb c\u1ee7a n\u00f3 ch\u1ec9 c\u00f3 th\u1ec3 l\u00e0 t\u1eeb 1 \u0111\u1ebfn 9. V\u00ec v\u1eady ch\u00fang ta s\u1ebd g\u1eafn s\u1ed1 0 \u0111\u1eb1ng tr\u01b0\u1edbc cho ph\u00f9 h\u1ee3p v\u1edbi chu\u1ea9n \u0111\u1ec1 ra ban \u0111\u1ea7u.<\/p>\n\n\n\n<p>N\u1ebfu s\u1ed1 l\u01b0\u1ee3ng k\u00fd t\u1ef1 kh\u00e1c 1, t\u1ee9c l\u00e0 n\u00f3 c\u00f3 2 ch\u1eef s\u1ed1 (10,11, cho \u0111\u1ebfn 31). Tr\u01b0\u1eddng h\u1ee3p n\u00e0y ch\u00fang ta kh\u00f4ng ph\u1ea3i ch\u1ec9nh s\u1eeda g\u00ec, v\u00e0 g\u00e1n l\u1ea1i gi\u00e1 tr\u1ecb trung gian cho gi\u00e1 tr\u1ecb ban \u0111\u1ea7u (\u0111o\u1ea1n <code>$mn2=$mn;<\/code>).<\/p>\n\n\n\n<p>M\u00e3 chuy\u1ec3n \u0111\u1ed5i cho th\u00e1ng c\u0169ng t\u01b0\u01a1ng t\u1ef1.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Nang_cao_chuc_nang_cua_ham\"><\/span>N\u00e2ng cao ch\u1ee9c n\u0103ng c\u1ee7a h\u00e0m<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>V\u1ec1 c\u01a1 b\u1ea3n ch\u00fang ta \u0111\u00e3 \u0111i \u0111\u01b0\u1ee3c n\u1eeda ch\u1eb7ng \u0111\u01b0\u1eddng, ch\u1ec9 c\u1ea7n x\u1eed l\u00fd d\u1eef li\u1ec7u n\u0103m t\u1eeb 2 s\u1ed1 th\u00e0nh 4 s\u1ed1 n\u1eefa l\u00e0 xong.<\/p>\n\n\n\n<p>\u1ede \u0111\u00e2y t\u00f4i mu\u1ed1n n\u00e2ng cao h\u00e0m chu\u1ea9n h\u00f3a ng\u00e0y th\u00e1ng n\u00e0y trong tr\u01b0\u1eddng h\u1ee3p t\u1ed5ng qu\u00e1t. T\u00f4i s\u1ebd b\u1ed5 sung th\u00eam t\u00ednh n\u0103ng \u0111\u1ec3 n\u00f3 x\u00e1c \u0111\u1ecbnh m\u1ed9t th\u1eddi \u0111i\u1ec3m n\u0103m sinh n\u00e0o \u0111\u00f3 c\u00f3 h\u1ee3p l\u1ec7 hay l\u00e0 kh\u00f4ng. \u0110\u1ec3 \u0111\u1ee1 ph\u1ee9c t\u1ea1p, bi\u1ebfn truy\u1ec1n v\u00e0o x\u00e1c th\u1ef1c d\u1eef li\u1ec7u ch\u1ec9 c\u1ea7n l\u00e0 n\u0103m, \u0111i\u1ec1u n\u00e0y c\u0169ng gi\u1ea3i quy\u1ebft \u0111\u01b0\u1ee3c ch\u00ednh x\u00e1c v\u1ea5n \u0111\u1ec1 trong r\u1ea5t nhi\u1ec1u tr\u01b0\u1eddng h\u1ee3p.<\/p>\n\n\n\n<p>H\u00e0m <code>function<\/code> gi\u1edd s\u1ebd c\u00f3 c\u1ea5u tr\u00fac nh\u01b0 th\u1ebf n\u00e0y:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function chuan_hoa_ntn($nscu,$nann,$naln,$utn) {}<\/code><\/pre>\n\n\n\n<p>Trong \u0111\u00f3 ngo\u00e0i bi\u1ebfn <code>$nscu<\/code> \u0111\u1ea1i di\u1ec7n d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng n\u0103m ch\u00fang ta c\u1ea7n x\u1eed l\u00fd th\u00ec gi\u1edd ch\u00fang ta c\u00f3 th\u00eam 3 bi\u1ebfn m\u1edbi:<\/p>\n\n\n\n<ul><li>Bi\u1ebfn <code>$nann<\/code> \u0111\u1ec3 ch\u1ec9 n\u0103m h\u1ee3p l\u1ec7 nh\u1ecf nh\u1ea5t \u0111\u01b0\u1ee3c ph\u00e9p, gi\u00e1 tr\u1ecb chu\u1ea9n l\u00e0 m\u1ed9t s\u1ed1 g\u1ed3m 4 ch\u1eef s\u1ed1 kh\u00f4ng \u0111\u01b0\u1ee3c nh\u1ecf h\u01a1n 1900;<\/li><li>Bi\u1ebfn <code>$naln<\/code> \u0111\u1ec3 ch\u1ec9 n\u0103m h\u1ee3p l\u1ec7 l\u1edbn nh\u1ea5t \u0111\u01b0\u1ee3c ph\u00e9p, gi\u00e1 tr\u1ecb chu\u1ea9n l\u00e0 m\u1ed9t s\u1ed1 c\u00f3 4 ch\u1eef s\u1ed1, l\u1edbn h\u01a1n ho\u1eb7c b\u1eb1ng gi\u00e1 tr\u1ecb c\u1ee7a <code>$nann<\/code>, nh\u01b0ng kh\u00f4ng \u0111\u01b0\u1ee3c l\u1edbn h\u01a1n n\u0103m hi\u1ec7n t\u1ea1i (2021 t\u1ea1i th\u1eddi \u0111i\u1ec3m t\u00f4i vi\u1ebft b\u00e0i n\u00e0y);<\/li><li>Bi\u1ebfn <code>$utn<\/code> li\u00ean quan \u0111\u1ebfn c\u00e1ch chuy\u1ec3n d\u1eef li\u1ec7u t\u1eeb 2 s\u1ed1 sang b\u1ed1n s\u1ed1 s\u1ebd \u01b0u ti\u00ean ki\u1ec3u chuy\u1ec3n n\u00e0o h\u01a1n, n\u00f3 c\u0169ng r\u1ea5t quan tr\u1ecdng, v\u1ec1 sau khi \u0111i v\u00e0o m\u00e3 chi ti\u1ebft b\u1ea1n s\u1ebd hi\u1ec3u r\u00f5 h\u01a1n;<\/li><\/ul>\n\n\n\n<p>\u1ede ph\u1ea7n m\u00e3 l\u1ea5y tham 3 tham s\u1ed1 \u0111\u1ea7u v\u00e0o \u1edf tr\u00ean kh\u00f4ng c\u00f3 g\u00ec qu\u00e1 \u0111\u1eb7c bi\u1ec7t, d\u00f9 n\u00f3 l\u00e0 m\u1ea5y v\u00f2ng IF tr\u00f4ng h\u01a1i l\u1eb1ng nh\u1eb1ng, m\u1ee5c \u0111\u00edch c\u1ed1t y\u1ebfu l\u00e0 \u0111\u1ec3 d\u1ef1 ph\u00f2ng ngay c\u1ea3 khi tham s\u1ed1 \u0111\u1ea7u v\u00e0o nh\u1eadp sai v\u00ed d\u1ee5 sai gi\u00e1 tr\u1ecb ho\u1eb7c th\u1eadm ch\u00ed nh\u1eadp v\u00e0o k\u00fd t\u1ef1 kh\u00e1c s\u1ed1, n\u00f3 v\u1eabn c\u00f3 \u0111\u01b0\u1ee3c c\u00e1c thi\u1ebft l\u1eadp c\u01a1 b\u1ea3n \u0111\u1ec3 tr\u00e1nh l\u1ed7i.<\/p>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi d\u1eef li\u1ec7u n\u0103m l\u00e0 d\u1ea1ng 4 s\u1ed1, c\u00f4ng vi\u1ec7c c\u1ee7a ch\u00fang ta r\u1ea5t \u0111\u01a1n gi\u1ea3n, ch\u00fang ta s\u1ebd chuy\u1ec3n d\u1eef li\u1ec7u \u0111\u00f3 th\u00e0nh d\u1ea1ng s\u1ed1 (d\u00f9ng h\u00e0m <code>(int)<\/code>) r\u1ed3i so s\u00e1nh n\u00f3 v\u1edbi gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t v\u00e0 nh\u1ecf nh\u1ea5t \u0111\u1ec3 x\u00e1c th\u1ef1c.<\/p>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi d\u1eef li\u1ec7u n\u0103m ch\u1ec9 c\u00f3 2 ch\u1eef s\u1ed1, v\u1ea5n \u0111\u1ec1 s\u1ebd ph\u1ee9c t\u1ea1p h\u01a1n. V\u00ed d\u1ee5 c\u1ee5 th\u1ec3 \u0111\u1ec3 ch\u00fang ta hi\u1ec3u r\u00f5 h\u01a1n:<\/p>\n\n\n\n<ul><li>Ch\u1eb3ng h\u1ea1n b\u1ea1n c\u00f3 d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o nh\u01b0 th\u1ebf n\u00e0y <code>29\/11\/15<\/code> d\u00f9 ch\u00fang ta bi\u1ebft r\u1eb1ng n\u0103m h\u1ee3p l\u1ec7 l\u00e0 t\u1eeb 1900 \u0111\u1ebfn n\u0103m hi\u1ec7n t\u1ea1i th\u00ec v\u1ea5n \u0111\u1ec1 \u1edf \u0111\u00e2y l\u00e0 ch\u00fang ta g\u00e1n 19 hay 20 th\u00eam v\u00e0o gi\u00e1 tr\u1ecb 15? V\u00ec c\u1ea3 hai gi\u00e1 tr\u1ecb n\u00e0y khi g\u00e1n v\u00e0o \u0111\u1ec1u kh\u00f4ng sai.<\/li><li>\u0110\u00e2y l\u00e0 l\u00fd do xu\u1ea5t hi\u1ec7n bi\u1ebfn <code>$utn<\/code> n\u1ebfu n\u00f3 c\u00f3 gi\u00e1 tr\u1ecb b\u1eb1ng 20, th\u00ec h\u00e0m s\u1ebd g\u00e1n 20 v\u00e0o c\u00e1c gi\u00e1 tr\u1ecb n\u1eb1m trong kho\u1ea3ng t\u1eeb 0 cho \u0111\u1ebfn 2 s\u1ed1 cu\u1ed1i c\u1ee7a n\u0103m hi\u1ec7n t\u1ea1i, t\u1ee9c l\u00e0 n\u1ebfu 2 s\u1ed1 c\u1ee7a n\u0103m cu\u1ed1i n\u1eb1m trong kho\u1ea3ng t\u1eeb 00 \u0111\u1ebfn 21 n\u00f3 s\u1ebd g\u00e1n 20 v\u00e0o, c\u00f2n n\u1ebfu r\u01a1i v\u00e0o c\u00e1c gi\u00e1 tr\u1ecb kh\u00e1c t\u1eeb 22 \u0111\u1ebfn 99 s\u1ebd g\u1eafn 19;<\/li><li>N\u1ebfu <code>$utn<\/code> \u0111\u01b0\u1ee3c \u0111\u1eb7t b\u1eb1ng 19, t\u1ea5t c\u1ea3 d\u1eef li\u1ec7u n\u0103m 2 s\u1ed1 s\u1ebd \u0111\u01b0\u1ee3c g\u1eafn th\u00eam 19 v\u00e0o tr\u01b0\u1edbc \u0111\u00f3;<\/li><li>Trong th\u1ef1c t\u1ebf \u0111\u1ed1i v\u1edbi c\u00e1c d\u1eef li\u1ec7u n\u0103m sinh ng\u01b0\u1eddi trong kho\u1ea3ng th\u1eddi gian g\u1ea7n hi\u1ec7n t\u1ea1i th\u00ec <code>$utn<\/code> b\u1eb1ng 20 s\u1ebd h\u1ee3p l\u00fd h\u01a1n n\u00ean m\u1eb7c \u0111\u1ecbnh h\u1ec7 th\u1ed1ng c\u0169ng set gi\u00e1 tr\u1ecb n\u00e0y n\u1ebfu v\u00f4 t\u00ecnh b\u1ea1n nh\u1eadp v\u00e0o gi\u00e1 tr\u1ecb kh\u00e1c 19 ho\u1eb7c 20;<\/li><\/ul>\n\n\n\n<p>\u1ede ph\u1ea7n cu\u1ed1i c\u00f9ng khi tr\u1ea3 v\u1ec1 gi\u00e1 tr\u1ecb cho h\u00e0m, t\u00f4i \u0111\u01b0a n\u00f3 v\u00e0o m\u1ea3ng, v\u00ec c\u1ea7n l\u01b0u t\u1edbi 3 k\u1ebft qu\u1ea3 kh\u00e1c nhau, bao g\u1ed3m:<\/p>\n\n\n\n<ul><li>M\u1ed9t gi\u00e1 tr\u1ecb 0 ho\u1eb7c 1 \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh d\u1eef li\u1ec7u c\u00f3 ph\u1ea3i l\u00e0 ng\u00e0y\/th\u00e1ng\/n\u0103m ti\u00eau chu\u1ea9n kh\u00f4ng, n\u00f3 l\u00e0 gi\u00e1 tr\u1ecb \u0111\u1ea7u ti\u00ean trong m\u1ea3ng;<\/li><li>Gi\u00e1 tr\u1ecb th\u1ee9 2 c\u1ee7a m\u1ea3ng l\u00e0 gi\u00e1 tr\u1ecb ng\u00e0y th\u00e1ng n\u0103m \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a v\u1edbi s\u1ed1 0 \u0111\u1eb1ng tr\u01b0\u1edbc c\u00e1c gi\u00e1 tr\u1ecb d\u01b0\u1edbi 10 trong ng\u00e0y ho\u1eb7c\/v\u00e0 th\u00e1ng. Ngo\u00e0i ra l\u00e0 chuy\u1ec3n \u0111\u1ed5i n\u0103m t\u1eeb d\u1ea1ng 2 s\u1ed1 v\u1ec1 4 s\u1ed1;<\/li><li>Gi\u00e1 tr\u1ecb cu\u1ed1i c\u00f9ng trong m\u1ea3ng c\u0169ng l\u00e0 d\u1ea1ng 0 ho\u1eb7c 1 \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh n\u0103m c\u1ee7a d\u1eef li\u1ec7u c\u00f3 n\u1eb1m trong kh\u1eb3ng n\u0103m nh\u1ecf nh\u1ea5t v\u00e0 l\u1edbn nh\u1ea5t hay kh\u00f4ng;<\/li><\/ul>\n\n\n\n<p>OK, cu\u1ed1i c\u00f9ng l\u00e0 \u0111o\u1ea1n m\u00e3 ho\u00e0n ch\u1ec9nh, b\u1ea1n c\u00f3 th\u1ec3 copy-paste n\u00f3 sang m\u1ed9t \u1ee9ng d\u1ee5ng chuy\u00ean \u0111\u1ec3 vi\u1ebft code PHP nh\u01b0 Netbeans s\u1ebd d\u1ec5 quan s\u00e1t h\u01a1n nhi\u1ec1u, v\u00ec trong m\u00e3 t\u00f4i vi\u1ebft r\u1ea5t nhi\u1ec1u ch\u00fa th\u00edch.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nfunction chuan_hoa_ntn($nscu,$nann,$naln,$utn) {\n        \/\/ $nscu l\u00e0 n\u0103m c\u1ea7n chu\u1ea9n h\u00f3a, $naln l\u00e0 n\u0103m l\u1edbn nh\u1ea5t \u0111\u01b0\u1ee3c cho ph\u00e9p trong d\u1eef li\u1ec7u\n        \/\/ gi\u00e1 tr\u1ecb h\u1ee3p l\u1ec7 c\u1ee7a $nann n\u0103m nh\u1ecf nh\u1ea5t nh\u1ea5t l\u00e0 1900 \u0111\u1ebfn t\u1ed1i \u0111a l\u00e0 n\u0103m hi\u1ec7n t\u1ea1i\n        \/\/ gi\u00e1 tr\u1ecb h\u1ee3p l\u1ec7 c\u1ee7a $naln n\u0103m l\u1edbn nh\u1ea5t l\u00e0 1900 \u0111\u1ebfn t\u1ed1i \u0111a l\u00e0 n\u0103m hi\u1ec7n t\u1ea1i\n        \/\/ nann c\u1ea7n ph\u1ea3i nh\u1ecf h\u01a1n naln \u0111\u00e2y l\u00e0 kho\u1ea3ng gi\u00e1 tr\u1ecb m\u00e0 ch\u00fang ta d\u00f9ng \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 gi\u00e1 tr\u1ecb n\u0103m c\u00f3 h\u1ee3p l\u1ec7 kh\u00f4ng\n        \/\/ nann n\u1ebfu kh\u00f4ng \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp ho\u1eb7c thi\u1ebft l\u1eadp sai s\u1ebd l\u1ea5y gi\u00e1 tr\u1ecb l\u00e0 1900\n        \/\/ khi naln kh\u00f4ng \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp ho\u1eb7c thi\u1ebft l\u1eadp sai n\u00f3 s\u1ebd l\u1ea5y gi\u00e1 tr\u1ecb m\u1eb7c \u0111\u1ecbnh l\u00e0 n\u0103m hi\u1ec7n t\u1ea1i\n        \/\/ $utn l\u00e0 \u01b0u ti\u00ean c\u00e1c gh\u00e9p d\u1eef li\u1ec7u n\u0103m 2 s\u1ed1 l\u00e0 19 hay 20 t\u00f9y tr\u01b0\u1eddng h\u1ee3p\n        \/\/ gi\u00e1 tr\u1ecb h\u1ee3p l\u1ec7 c\u1ee7a $utn l\u00e0 19 ho\u1eb7c 20, khi kh\u00f4ng thi\u1ebft l\u1eadp ho\u1eb7c thi\u1ebft l\u1eadp sai n\u00f3 m\u1eb7c \u0111\u1ecbnh l\u00e0 20\n        $nscu1 = trim($nscu, ' '); \/\/ lo\u1ea1i b\u1ecf kho\u1ea3ng tr\u1eafng tr\u01b0\u1edbc v\u00e0 sau chu\u1ed7i\n        $nscu2 = preg_replace('\/\\s+\/', ' ', $nscu1); \/\/ lo\u1ea1i b\u1ecf kho\u1ea3ng tr\u1eafng th\u1eeba \u1edf gi\u1eefa chu\u1ed7i\n        \n        $ktdu = array('~', '!', '@', '#','$', '%', '^', '&amp;', '*', '(', ')', '_', '=', '+', '&#91;', '{', ']', '}', '|', ':', ';', '\"', ',', '&lt;', '>', '?', '+', '\\\\', '\\''); \/\/ k\u00fd t\u1ef1 d\u01b0 l\u1ed7i\n        \/\/ V\u00ec tr\u00f9ng v\u1edbi c\u00fa ph\u00e1p trong PHP n\u00ean m\u1ed9t s\u1ed1 d\u1ea5u nh\u01b0 ' v\u00e0 \\ b\u1ea1n c\u1ea7n th\u00eam d\u1ea5u \\ \u0111\u1eb1ng tr\u01b0\u1edbc, kh\u00f4ng n\u00f3 s\u1ebd b\u00e1o l\u1ed7i.\n        \n        $nscu3 = str_replace($ktdu, \"\", $nscu2); \/\/ c\u00e2u l\u1ec7nh lo\u1ea1i b\u1ecf k\u00fd t\u1ef1 d\u01b0\n        \n        \/\/ Chuy\u1ec3n v\u00ea c\u00f9ng m\u1ed9t d\u1ea1ng d\u1ea5u ph\u00e2n c\u00e1ch\n        $nscu4 = preg_replace('\/\\.\/', '\/', $nscu3); \/\/thay d\u1ea5u ch\u1ea5m\n        $nscu5 = preg_replace('\/-\/', '\/', $nscu4); \/\/thay d\u1ea5u g\u1ea1ch ngang\n        \n        $rea = '\/^(0?&#91;1-9]|&#91;12]\\d|3&#91;01])&#91;\\\/](0?&#91;1-9]|&#91;1]&#91;012])&#91;\\\/](\\d{2}|19\\d{2}|20&#91;012]\\d)$\/'; \/\/ n\u0103m ch\u1ec9 h\u1ee3p l\u1ec7 t\u1eeb 1900 \u0111\u1ebfn 2029\n        \/\/ Bi\u1ec3u th\u1ee9c ch\u00ednh quy Regex n\u00e0y b\u1eaft ng\u00e0y th\u00e1ng n\u0103m kh\u00e1 ch\u1eb7t\n        \/\/ ng\u00e0y t\u1eeb 1 \u0111\u1ebfn 31 c\u00f3 th\u1ec3 c\u00f3 0 \u1edf tr\u01b0\u1edbc s\u1ed1 d\u01b0\u1edbi 10\n        \/\/ th\u00e1ng t\u1eeb 1 \u0111\u1ebfn 12, c\u00f3 th\u1ec3 c\u00f3 0 \u0111\u1eb1ng tr\u01b0\u1edbc s\u1ed1 d\u01b0\u1edbi 10\n        \/\/ n\u0103m b\u1eaft t\u1eeb n\u0103m 1900 \u0111\u1ebfn t\u1ed1i \u0111a 2029, h\u00e0m n\u00e0y \u0111\u00fang trong v\u00f2ng 8 n\u0103m n\u1eefa, \u0111\u1ebfn n\u0103m 2030 h\u00e0m b\u1eaft n\u0103m sinh s\u1ebd kh\u00f4ng c\u00f2n \u0111\u00fang n\u1eefa\n        \n        $kq=preg_match($rea, $nscu5, $match); \/\/ ki\u1ec3m tra xem c\u00f3 kh\u1edbp v\u1edbi m\u1eabu chu\u1ea9n hay ch\u01b0a\n        \n        if($kq==1) {\n                $mn=$match&#91;1]; \/\/ l\u1ea5y th\u00f4ng tin ng\u00e0y\n                $s_mn=(int)$mn;\n                if (mb_strlen($s_mn)==1) {$mn2=\"0\".$s_mn;} else {$mn2=$mn;} \/\/\u0111\u00e3 chuy\u1ec3n ng\u00e0y d\u1ea1ng d\u01b0\u1edbi 10 kh\u00f4ng c\u00f3 s\u1ed1 kh\u00f4ng \u0111\u1eb1ng tr\u01b0\u1edbc th\u00e0nh c\u00f3 s\u1ed1 0 \u0111\u1eb1ng tr\u01b0\u1edbc\n                \n                $mt=$match&#91;2]; \/\/ l\u1ea5y th\u00f4ng tin th\u00e1ng\n                $s_mt=(int)$mt;\n                if (mb_strlen($s_mt)==1) {$mt2=\"0\".$s_mt;} else {$mt2=$mt;}\/\/\u0111\u00e3 chuy\u1ec3n th\u00e1ng d\u1ea1ng d\u01b0\u1edbi 10 kh\u00f4ng c\u00f3 s\u1ed1 kh\u00f4ng \u0111\u1eb1ng tr\u01b0\u1edbc th\u00e0nh c\u00f3 s\u1ed1 0 \u0111\u1eb1ng tr\u01b0\u1edbc\n\n                $ns_hl=1; \/\/ ki\u1ec3m tra xem gi\u00e1 tr\u1ecb c\u1ee7a n\u0103m c\u00f3 h\u1ee3p l\u1ec7 hay kh\u00f4ng, m\u1eb7c \u0111\u1ecbnh \u0111\u1ec3 l\u00e0 h\u1ee3p l\u1ec7\n\n                $nho_chuoi_nam=$match&#91;3]; \/\/\u0111\u1ec3 g\u1eafn v\u00e0o khi c\u1ea7n\n\n                $mna=$match&#91;3]; \/\/ l\u1ea5y n\u0103m trong chu\u1ed7i\n                $s_mna=(int)$mna; \/\/ chuy\u1ec3n v\u1ec1 d\u1ea1ng s\u1ed1, n\u1ebfu l\u00e0 d\u1ea1ng 4 s\u1ed1 s\u1ebd chuy\u1ec3n th\u00e0nh 4 s\u1ed1, n\u1ebfu l\u00e0 d\u1ea1n 2 s\u1ed1 s\u1ebd chuy\u1ec3n th\u00e0nh 2 s\u1ed1, n\u1ebfu 2 s\u1ed1 c\u00f3 s\u1ed1 0 \u0111\u1eb1ng tr\u01b0\u1edbc s\u1ebd chuy\u1ec3n th\u00e0nh d\u1ea1ng 1 s\u1ed1\n\n                $y4=date(\"Y\"); \/\/ l\u1ea5y gi\u00e1 tr\u1ecb c\u1ee7a n\u0103m hi\u1ec7n t\u1ea1i \u1edf d\u1ea1ng 4 s\u1ed1, \u0111\u00e2y l\u00e0 m\u1ed9t h\u00e0m c\u1ee7a PHP, d\u00f9ng d\u1ef1 ph\u00f2ng trong tr\u01b0\u1eddng h\u1ee3p gi\u00e1 tr\u1ecb n\u0103m l\u1edbn nh\u1ea5t $nln kh\u00f4ng \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp\n\n                \/\/ \u0110\u00e1nh gi\u00e1 tham s\u1ed1 n\u0103m nh\u1ecf nh\u1ea5t truy\u1ec1n v\u00e0o h\u00e0m\n                if (isset($nann)) { \/\/ ki\u1ec3m tra xem d\u1eef li\u1ec7u n\u0103m l\u1edbn nh\u1ea5t c\u00f3 \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o h\u00e0m hay kh\u00f4ng\n                                    $nann=(int)$nann; \/\/chuy\u1ec3n n\u00f3 v\u1ec1 d\u1ea1ng s\u1ed1 v\u00ec h\u00e0m is_int ki\u1ec3m tra ch\u1eb7t\n                                    if (is_int($nann)) { \/\/ ki\u1ec3m tra xem n\u00f3 c\u00f3 ph\u1ea3i l\u00e0 s\u1ed1 nguy\u00ean hay kh\u00f4ng?\n                                                        if ($nann>$y4 || $nann&lt;1900) {$nann_tt=1900;} \/\/n\u1ebfu c\u00f3 th\u00ec ki\u1ec3m tra n\u00f3 c\u00f3 n\u1eb1m trong gi\u00e1 tr\u1ecb h\u1ee3p l\u1ec7 kh\u00f4ng \n                                                        \/\/ n\u1ebfu kh\u00f4ng h\u1ee3p th\u00ec naln \u0111\u01b0\u1ee3c g\u00e1n cho 1900\n                                                        else {$nann_tt=$nann;}}\/\/n\u1ebfu h\u1ee3p l\u1ec7 n\u00f3 m\u1edbi \u0111\u01b0\u1ee3c g\u00e1n gi\u00e1 tr\u1ecb v\u00e0o nann_tt\n                                    else {$nann_tt=1900;} \/\/ n\u1ebfu gi\u00e1 tr\u1ecb nh\u1eadp v\u00e0o kh\u00f4ng ph\u1ea3i l\u00e0 s\u1ed1 n\u00f3 c\u0169ng \u0111\u01b0\u1ee3c g\u00e1n cho $y4, t\u1ee9c l\u00e0 n\u0103m hi\u1ec7n t\u1ea1i                   \n                } else {$nann_tt=1900;} \/\/ n\u1ebfu c\u00f3 tham s\u1ed1 th\u00ec l\u1ea5y gi\u00e1 tr\u1ecb c\u1ee7a $nln, c\u00f2n n\u1ebfu kh\u00f4ng c\u00f3 th\u00ec l\u1ea5y n\u0103m hi\u1ec7n t\u1ea1i\n                $nann_tt=(int)$nann_tt;\/\/chuy\u1ec3n sang gi\u00e1 tr\u1ecb s\u00f3 cho ch\u1eafc \u0103n\n\n                \/\/ \u0110\u00e1nh gi\u00e1 tham s\u1ed1 n\u0103m l\u1edbn nh\u1ea5t truy\u1ec1n v\u00e0o h\u00e0m\n                if (isset($naln)) { \/\/ ki\u1ec3m tra xem d\u1eef li\u1ec7u n\u0103m l\u1edbn nh\u1ea5t c\u00f3 \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o h\u00e0m hay kh\u00f4ng\n                                    $naln=(int)$naln; \/\/chuy\u1ec3n n\u00f3 v\u1ec1 d\u1ea1ng s\u1ed1 v\u00ec h\u00e0m is_int ki\u1ec3m tra ch\u1eb7t\n                                    if (is_int($naln)) { \/\/ ki\u1ec3m tra xem n\u00f3 c\u00f3 ph\u1ea3i l\u00e0 s\u1ed1 nguy\u00ean hay kh\u00f4ng?\n                                                        if ($naln>$y4 || $naln&lt;1900) {$ntt=$y4;} \/\/n\u1ebfu c\u00f3 th\u00ec ki\u1ec3m tra n\u00f3 c\u00f3 n\u1eb1m trong gi\u00e1 tr\u1ecb h\u1ee3p l\u1ec7 kh\u00f4ng \n                                                        \/\/ n\u1ebfu kh\u00f4ng h\u1ee3p th\u00ec naln \u0111\u01b0\u1ee3c g\u00e1n cho n\u0103m hi\u1ec7n t\u1ea1i\n                                                        else {$ntt=$naln;}}\/\/n\u1ebfu h\u1ee3p l\u1ec7 n\u00f3 m\u1edbi \u0111\u01b0\u1ee3c g\u00e1n gi\u00e1 tr\u1ecb v\u00e0o ntt\n                                    else {$ntt=$y4;} \/\/ n\u1ebfu gi\u00e1 tr\u1ecb nh\u1eadp v\u00e0o kh\u00f4ng ph\u1ea3i l\u00e0 s\u1ed1 n\u00f3 c\u0169ng \u0111\u01b0\u1ee3c g\u00e1n cho $y4, t\u1ee9c l\u00e0 n\u0103m hi\u1ec7n t\u1ea1i                   \n                } else {$ntt=$y4;} \/\/ n\u1ebfu c\u00f3 tham s\u1ed1 th\u00ec l\u1ea5y gi\u00e1 tr\u1ecb c\u1ee7a $nln, c\u00f2n n\u1ebfu kh\u00f4ng c\u00f3 th\u00ec l\u1ea5y n\u0103m hi\u1ec7n t\u1ea1i\n\n                $nss=(int)$ntt; \/\/ l\u1ea5y n\u0103m so s\u00e1nh v\u00e0 chuy\u1ec3n v\u1ec1 d\u1ea1ng s\u1ed1, c\u00e1i n\u00e0y l\u00e0 4 s\u1ed1, c\u00f3 gi\u00e1 tr\u1ecb h\u1ee3p l\u1ec7 t\u1eeb 1900 \u0111\u1ebfn t\u1ed1i \u0111a l\u00e0 n\u0103m hi\u1ec7n t\u1ea1i\n\n                if (mb_strlen($s_mna)==4) {\/\/V\u1edbi chu\u1ed7i n\u0103m l\u00e0 4 s\u1ed1\n                        if (($s_mna>$nss) || ($s_mna&lt;$nann_tt)) {$ns_hl=0;}\n                        $con_nam4so=$nho_chuoi_nam;\n                }\n                \n                \/\/ \u0110\u00e1nh gi\u00e1 tham s\u1ed1 \u01b0u ti\u00ean truy\u1ec1n v\u00e0o\n                if (isset($utn)) { \/\/ ki\u1ec3m tra xem gi\u00e1 tr\u1ecb \u01b0u ti\u00ean c\u00f3 \u0111\u01b0\u1ee3c truy\u1ec1n v\u00e0o h\u00e0m hay kh\u00f4ng\n                                    $utn=(int)$utn; \/\/chuy\u1ec3n n\u00f3 v\u1ec1 d\u1ea1ng s\u1ed1 v\u00ec h\u00e0m is_int ki\u1ec3m tra ch\u1eb7t\n                                    if (is_int($utn)) { \/\/ ki\u1ec3m tra xem n\u00f3 c\u00f3 ph\u1ea3i l\u00e0 s\u1ed1 nguy\u00ean hay kh\u00f4ng?\n                                                        if ($utn>20 || $utn&lt;19) {$utn_tt=20;}\n                                                        else {$utn_tt=$utn;}\/\/n\u1ebfu h\u1ee3p l\u1ec7 m\u1edbi \u0111\u01b0\u1ee3c g\u00e1n\n                                    }\n                                    else {$utn_tt=20;} \/\/ n\u1ebfu gi\u00e1 tr\u1ecb nh\u1eadp v\u00e0o kh\u00f4ng ph\u1ea3i l\u00e0 s\u1ed1 n\u00f3 c\u0169ng \u0111\u01b0\u1ee3c g\u00e1n l\u00e0 20                \n                } else {$utn_tt=20;} \/\/ n\u1ebfu c\u00f3 tham s\u1ed1 th\u00ec l\u1ea5y gi\u00e1 tr\u1ecb c\u1ee7a $utn, c\u00f2n n\u1ebfu kh\u00f4ng c\u00f3 th\u00ec l\u1ea5y gi\u00e1 tr\u1ecb m\u1eb7c \u0111\u1ecbnh l\u00e0 20\n                \n\n                if (mb_strlen($mna)==2) {\/\/V\u1edbi chu\u1ed7i n\u0103m l\u00e0 2 s\u1ed1\n                           $rep='\/^\\d{2}\/'; \/\/bi\u1ec3u th\u1ee9c ch\u00ednh quy \u0111\u1ec3 ch\u1ecdn 2 k\u00fd t\u1ef1 \u0111\u1ea7u r\u1ed3i thay th\u1ebf n\u00f3 b\u1eb1ng r\u1ed7ng \u1edf bi\u1ec3u th\u1ee9c b\u00ean d\u01b0\u1edbi \u0111\u1ec3 ch\u00fang ta c\u00f3 2 s\u1ed1 cu\u1ed1i\n                           $nss_tach=preg_replace($rep,'',$nss);\/\/l\u1ea5y 2 s\u1ed1 cu\u1ed1i c\u1ee7a n\u0103m c\u1ea7n so s\u00e1nh\n                           $nn_so=(int)$nss_tach; \/\/chuy\u1ec3n th\u00e0nh d\u1ea1ng s\u1ed1\n                           $y2=date(\"y\"); \/\/ l\u1ea5y gi\u00e1 tr\u1ecb 2 n\u0103m cu\u1ed1i c\u1ee7a n\u0103m hi\u1ec7n t\u1ea1i\n                           \/\/ gi\u00e1 tr\u1ecb \u01b0u ti\u00ean d\u00f9ng \u0111\u1ec3 quy\u1ebft \u0111\u1ecbnh gh\u00e9p s\u1ed1 \u1edf ph\u1ea7n n\u00e0y\n                                if ($utn_tt==19) {$nam4so=\"19\".$nho_chuoi_nam;} \n                                if ($utn_tt==20) {if ($s_mna>=0 &amp;&amp; $s_mna&lt;=$y2) {$nam4so=\"20\".$nho_chuoi_nam;} else {$nam4so=\"19\".$nho_chuoi_nam;}}\n                        \n                            $con_nam4so=(int)$nam4so;\n                            if(($con_nam4so>$nss) || ($con_nam4so&lt;$nann_tt)) {$ns_hl=0;}\n                 }\n             $kqi=$mn2.\"\/\".$mt2.\"\/\".$con_nam4so;\n              \n        } else {$kqi=$nscu5;$ns_hl=0;} \/\/ n\u1ebfu h\u1ee3p chu\u1ea9n s\u1ebd \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a, n\u1ebfu kh\u00f4ng s\u1ebd tr\u1ea3 v\u1ec1 $nscu5\n$ntn_arr=array();\n\n$ntn_arr&#91;0]=$kq; \/\/ xem c\u00f3 ph\u1ea3i l\u00e0 chu\u1ed7i ng\u00e0y th\u00e1ng n\u0103m h\u1ee3p chu\u1ea9n kh\u00f4ng, 1 l\u00e0 h\u1ee3p chu\u1ea9n, 0 l\u00e0 kh\u00f4ng h\u1ee3p chu\u1ea9n\n$ntn_arr&#91;1]=$kqi; \/\/ n\u1ebfu h\u1ee3p chu\u1ea9n s\u1ebd \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a, n\u1ebfu kh\u00f4ng s\u1ebd tr\u1ea3 v\u1ec1 $nscu5\n$ntn_arr&#91;2]=$ns_hl; \/\/ b\u00e1o xem n\u0103m c\u00f3 h\u1ee3p l\u1ec7 so v\u1edbi y\u00eau c\u1ea7u c\u1ee7a n\u0103m l\u1edbn nh\u1ea5t kh\u00f4ng, gi\u00e1 tr\u1ecb 0, 1. N\u1ebfu b\u1eb1ng 1 l\u00e0 h\u1ee3p l\u1ec7\n\nreturn $ntn_arr;\n}\n$nscu2=\"1-2-99\";$nann2=\"1997\";$naln2=\"2012\";$utn2=\"20\";\n$tim=chuan_hoa_ntn($nscu2,$nann2,$naln2,$utn2);\n$kqt=\"\";\n\nforeach ($tim as $kqc) {\n    echo $kqc.\"&lt;\/br>\";\n}\n<\/code><\/pre>\n\n\n\n<p>V\u00e0i k\u1ebft qu\u1ea3 demo:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u0110\u1ea7u v\u00e0o: $nscu2=\"1-2-09\";$nann2=\"2005\";$naln2=\"2015\";$utn2=\"20\";\n\u0110\u1ea7u ra: \n1 -> d\u1eef li\u1ec7u \u0111\u00fang chu\u1ea9n th\u1ee9 t\u1ef1 ng\u00e0y th\u00e1ng n\u0103m\n01\/02\/2009 -> d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a\n1 -> n\u0103m n\u1eb1m trong kho\u1ea3ng thi\u1ebft l\u1eadp\n\n-----\n\u0110\u1ea7u v\u00e0o: $nscu2=\"1-2-09\";$nann2=\"2010\";$naln2=\"2015\";$utn2=\"20\";\n\u0110\u1ea7u ra:\n1\n01\/02\/2009\n0 -> n\u0103m n\u1eb1m ngo\u00e0i kho\u1ea3ng thi\u1ebft l\u1eadp\n\n-----\n\u0110\u1ea7u v\u00e0o: $nscu2=\"1-2-9\";$nann2=\"2010\";$naln2=\"2015\";$utn2=\"20\";\n\u0110\u1ea7u ra:\n0 -> kh\u00f4ng ph\u1ea3i d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng\n1\/2\/9\n0 -> khi \u0111\u00e3 kh\u00f4ng ph\u1ea3i d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng, gi\u00e1 tr\u1ecb cu\u1ed1i c\u00f9ng ch\u1eafc ch\u1eafn l\u00e0 0\n\n\n-----\n\u0110\u1ea7u v\u00e0o: $nscu2=\"1.2.89\";$nann2=\"1980\";$naln2=\"2015\";$utn2=\"20\";\n\u0110\u1ea7u ra:\n1 -> \u0111\u00fang d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng n\u0103m\n01\/02\/1989 -> d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a\n1 -> n\u0103m n\u1eb1m trong kho\u1ea3ng thi\u1ebft l\u1eadp\n\n-----\n\u0110\u1ea7u v\u00e0o: $nscu2=\"1.2.15\";$nann2=\"1980\";$naln2=\"2015\";$utn2=\"19\";\nB\u1ea1n ch\u00fa \u00fd $utn2 \u0111\u00e3 chuy\u1ec3n th\u00e0nh 19\n\u0110\u1ea7u ra:\n1\n01\/02\/1915 -> n\u1ebfu $utn\n b\u1eb1ng 20, n\u0103m s\u1ebd \u0111\u01b0\u1ee3c chuy\u1ec3n th\u00e0nh 2015\n0\n\n----\n\u0110\u1ea7u v\u00e0o: $nscu2=\"1.2.15\";$nann2=\"cdsd\";$naln2=\"\u00ear\";$utn2=\"rer\";\nB\u1ea1n ch\u00fa \u00fd c\u00e1c 3 bi\u1ebfn cu\u1ed1i c\u00f9ng nh\u1eadp sai d\u1eef li\u1ec7u ti\u00eau chu\u1ea9n\n\u0110\u1ea7u ra:\n1\n01\/02\/2015\n1<\/code><\/pre>\n\n\n\n<p>OK, nh\u01b0 v\u1eady l\u00e0 t\u1ea1m \u1ed5n r\u1ed3i, xin ch\u00e0o v\u00e0 h\u1eb9n g\u1eb7p l\u1ea1i c\u00e1c b\u1ea1n trong b\u00e0i vi\u1ebft kh\u00e1c.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Trong b\u00e0i vi\u1ebft tr\u01b0\u1edbc, t\u00f4i \u0111\u00e3 vi\u1ebft 2 h\u00e0m x\u1eed l\u00fd ng\u00e0y th\u00e1ng n\u0103m d\u1ea1ng th\u00f4. N\u00f3 c\u00f3 t\u00e1c d\u1ee5ng r\u1ea5t t\u1ed1t trong vi\u1ec7c th\u1ed1ng k\u00ea t\u1ed5ng th\u1ec3 d\u1eef li\u1ec7u c\u1ee7a ch\u00fang ta. Cho ta bi\u1ebft c\u1ea5u tr\u00fac d\u1eef li\u1ec7u ch\u1ee7 y\u1ebfu c\u1ee7a n\u00f3, c\u0169ng nh\u01b0 xu\u1ea5t ra c\u00e1c d\u1eef li\u1ec7u kh\u00f4ng h\u1ee3p chu\u1ea9n. B\u00e2y &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[238],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>N\u1ebfu \u0111\u00e3 bi\u1ebft c\u1ea5u tr\u00fac d\u1eef li\u1ec7u c\u1ee7a ng\u00e0y th\u00e1ng n\u0103m sinh, ch\u00fang ta c\u00f3 th\u1ec3 x\u1eed l\u00fd th\u00eam g\u00ec n\u1eefa &#8226; Ki\u1ebfn c\u00e0ng<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kiencang.net\/xu-ly-them-ngay-thang-nam\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"N\u1ebfu \u0111\u00e3 bi\u1ebft c\u1ea5u tr\u00fac d\u1eef li\u1ec7u c\u1ee7a ng\u00e0y th\u00e1ng n\u0103m sinh, ch\u00fang ta c\u00f3 th\u1ec3 x\u1eed l\u00fd th\u00eam g\u00ec n\u1eefa &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"Trong b\u00e0i vi\u1ebft tr\u01b0\u1edbc, t\u00f4i \u0111\u00e3 vi\u1ebft 2 h\u00e0m x\u1eed l\u00fd ng\u00e0y th\u00e1ng n\u0103m d\u1ea1ng th\u00f4. N\u00f3 c\u00f3 t\u00e1c d\u1ee5ng r\u1ea5t t\u1ed1t trong vi\u1ec7c th\u1ed1ng k\u00ea t\u1ed5ng th\u1ec3 d\u1eef li\u1ec7u c\u1ee7a ch\u00fang ta. Cho ta bi\u1ebft c\u1ea5u tr\u00fac d\u1eef li\u1ec7u ch\u1ee7 y\u1ebfu c\u1ee7a n\u00f3, c\u0169ng nh\u01b0 xu\u1ea5t ra c\u00e1c d\u1eef li\u1ec7u kh\u00f4ng h\u1ee3p chu\u1ea9n. B\u00e2y &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kiencang.net\/xu-ly-them-ngay-thang-nam\/\" \/>\n<meta property=\"og:site_name\" content=\"Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/anhducnguyen87\/\" \/>\n<meta property=\"article:published_time\" content=\"2021-08-17T17:45:17+00:00\" \/>\n<meta name=\"author\" content=\"Nguy\u1ec5n \u0110\u1ee9c Anh\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"Nguy\u1ec5n \u0110\u1ee9c Anh\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"17 ph\u00fat\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"N\u1ebfu \u0111\u00e3 bi\u1ebft c\u1ea5u tr\u00fac d\u1eef li\u1ec7u c\u1ee7a ng\u00e0y th\u00e1ng n\u0103m sinh, ch\u00fang ta c\u00f3 th\u1ec3 x\u1eed l\u00fd th\u00eam g\u00ec n\u1eefa &#8226; Ki\u1ebfn c\u00e0ng","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/kiencang.net\/xu-ly-them-ngay-thang-nam\/","og_locale":"vi_VN","og_type":"article","og_title":"N\u1ebfu \u0111\u00e3 bi\u1ebft c\u1ea5u tr\u00fac d\u1eef li\u1ec7u c\u1ee7a ng\u00e0y th\u00e1ng n\u0103m sinh, ch\u00fang ta c\u00f3 th\u1ec3 x\u1eed l\u00fd th\u00eam g\u00ec n\u1eefa &#8226; Ki\u1ebfn c\u00e0ng","og_description":"Trong b\u00e0i vi\u1ebft tr\u01b0\u1edbc, t\u00f4i \u0111\u00e3 vi\u1ebft 2 h\u00e0m x\u1eed l\u00fd ng\u00e0y th\u00e1ng n\u0103m d\u1ea1ng th\u00f4. N\u00f3 c\u00f3 t\u00e1c d\u1ee5ng r\u1ea5t t\u1ed1t trong vi\u1ec7c th\u1ed1ng k\u00ea t\u1ed5ng th\u1ec3 d\u1eef li\u1ec7u c\u1ee7a ch\u00fang ta. Cho ta bi\u1ebft c\u1ea5u tr\u00fac d\u1eef li\u1ec7u ch\u1ee7 y\u1ebfu c\u1ee7a n\u00f3, c\u0169ng nh\u01b0 xu\u1ea5t ra c\u00e1c d\u1eef li\u1ec7u kh\u00f4ng h\u1ee3p chu\u1ea9n. 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T\u00f4i th\u00edch Content, SEO, Ads, T\u0103ng t\u1ed1c website v\u00e0 Th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed. B\u00ean c\u1ea1nh b\u00e0i t\u1ef1 vi\u1ebft, t\u00f4i c\u0169ng d\u1ecbch nhi\u1ec1u n\u1ed9i dung th\u00fa v\u1ecb c\u1ee7a c\u00e1c t\u00e1c gi\u1ea3 kh\u00e1c nhau. FB c\u00e1 nh\u00e2n: facebook.com\/anhducnguyen87. Email li\u00ean h\u1ec7: guiemailchotoi@gmail.com","sameAs":["https:\/\/www.facebook.com\/anhducnguyen87\/"],"url":"https:\/\/kiencang.net\/author\/admin\/"}]}},"_links":{"self":[{"href":"https:\/\/kiencang.net\/wp-json\/wp\/v2\/posts\/13961"}],"collection":[{"href":"https:\/\/kiencang.net\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kiencang.net\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kiencang.net\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kiencang.net\/wp-json\/wp\/v2\/comments?post=13961"}],"version-history":[{"count":0,"href":"https:\/\/kiencang.net\/wp-json\/wp\/v2\/posts\/13961\/revisions"}],"wp:attachment":[{"href":"https:\/\/kiencang.net\/wp-json\/wp\/v2\/media?parent=13961"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kiencang.net\/wp-json\/wp\/v2\/categories?post=13961"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kiencang.net\/wp-json\/wp\/v2\/tags?post=13961"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}