{"id":9068,"date":"2025-01-01T10:28:33","date_gmt":"2025-01-01T10:28:33","guid":{"rendered":"https:\/\/blog.ezworkapp.com\/index.php\/2025\/01\/01\/huong-dan-cach-tim-ngay-dau-tien-cua-thang-voi-ham-day\/"},"modified":"2025-01-01T10:28:33","modified_gmt":"2025-01-01T10:28:33","slug":"huong-dan-cach-tim-ngay-dau-tien-cua-thang-voi-ham-day","status":"publish","type":"post","link":"https:\/\/blog.ezworkapp.com\/index.php\/2025\/01\/01\/huong-dan-cach-tim-ngay-dau-tien-cua-thang-voi-ham-day\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn c\u00e1ch t\u00ecm ng\u00e0y \u0111\u1ea7u ti\u00ean c\u1ee7a th\u00e1ng v\u1edbi h\u00e0m DAY"},"content":{"rendered":"<div class=\"uk-panel uk-margin\" id=\"template-nJy84WMn#1\">\n<p>Trong b\u00e0i vi\u1ebft tr\u01b0\u1edbc c\u1ee7a H\u1ecdc Excel Online, b\u1ea1n \u0111\u00e3 \u0111\u01b0\u1ee3c t\u00ecm hi\u1ec3u v\u1ec1 h\u00e0m\u00a0<strong>EOMONTH<\/strong> gi\u00fap t\u00ecm ng\u00e0y cu\u1ed1i c\u00f9ng trong th\u00e1ng. V\u1eady \u0111\u1ec3 t\u00ecm ng\u00e0y \u0111\u1ea7u ti\u00ean c\u1ee7a th\u00e1ng (ng\u00e0y<strong> 1<\/strong>) m\u00e0 kh\u00f4ng ph\u1ea3i g\u00f5 th\u1ee7 c\u00f4ng v\u00e0o t\u1eebng \u00f4, ta l\u00e0m th\u1ebf n\u00e0o? H\u00e3y \u0111\u1ecdc b\u00e0i vi\u1ebft sau: S\u1eed d\u1ee5ng h\u00e0m DAY t\u00ecm ng\u00e0y \u0111\u1ea7u ti\u00ean c\u1ee7a th\u00e1ng.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_61 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<p class=\"ez-toc-title\">Xem nhanh<\/p>\n<p><label for=\"ez-toc-cssicon-toggle-item-677518d04d1d0\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><\/span><\/span><\/label><\/p>\n<nav>\n<ul class=\"ez-toc-list ez-toc-list-level-1 \">\n<li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/blog.hocexcel.online\/tim-ngay-dau-tien-cua-thang-voi-ham-day.html#Su_dung_ham_DAY_tim_ngay_dau_tien_cua_thang\" title=\"S\u1eed d\u1ee5ng h\u00e0m DAY t\u00ecm ng\u00e0y \u0111\u1ea7u ti\u00ean c\u1ee7a th\u00e1ng\">S\u1eed d\u1ee5ng h\u00e0m DAY t\u00ecm ng\u00e0y \u0111\u1ea7u ti\u00ean c\u1ee7a th\u00e1ng<\/a>\n<ul class=\"ez-toc-list-level-4\">\n<li class=\"ez-toc-heading-level-4\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/blog.hocexcel.online\/tim-ngay-dau-tien-cua-thang-voi-ham-day.html#Vi_du\" title=\"V\u00ed d\u1ee5\">V\u00ed d\u1ee5<\/a><\/li>\n<\/ul>\n<\/li>\n<li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/blog.hocexcel.online\/tim-ngay-dau-tien-cua-thang-voi-ham-day.html#Su_dung_ham_EOMONTH_de_tim_ngay_dau_thang\" title=\"S\u1eed d\u1ee5ng h\u00e0m EOMONTH \u0111\u1ec3 t\u00ecm ng\u00e0y \u0111\u1ea7u th\u00e1ng\">S\u1eed d\u1ee5ng h\u00e0m EOMONTH \u0111\u1ec3 t\u00ecm ng\u00e0y \u0111\u1ea7u th\u00e1ng<\/a><\/li>\n<\/ul>\n<\/nav>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"Su_dung_ham_DAY_tim_ngay_dau_tien_cua_thang\"><\/span>S\u1eed d\u1ee5ng h\u00e0m DAY t\u00ecm ng\u00e0y \u0111\u1ea7u ti\u00ean c\u1ee7a th\u00e1ng<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>C\u00f4ng th\u1ee9c ta s\u1eed d\u1ee5ng trong b\u00e0i l\u1ea7n n\u00e0y s\u1ebd l\u00e0:<\/p>\n<blockquote>\n<p class=\"excel geshifilter-excel\"><strong><span class=\"sy1\">=ng\u00e0y th\u00e1ng nh\u1eadp v\u00e0o<\/span><span class=\"sy1\">\u2013<\/span><span class=\"kw4\">D<\/span><span class=\"kw4\">AY<\/span><span class=\"sy0\">(ng\u00e0y th\u00e1ng nh\u1eadp v\u00e0o<\/span><span class=\"sy0\">)<\/span><span class=\"sy1\">+<\/span><span class=\"nu0\">1<\/span><\/strong><\/p>\n<\/blockquote>\n<p class=\"excel geshifilter-excel\">Trong \u0111\u00f3\u00a0<strong>ng\u00e0y th\u00e1ng nh\u1eadp v\u00e0o\u00a0<\/strong>c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t tham chi\u1ebfu t\u1edbi \u00f4 ch\u1ee9a d\u1eef li\u1ec7u ng\u00e0y th\u00e1ng, ho\u1eb7c nh\u1eadp tr\u1ef1c ti\u1ebfp t\u1eeb b\u00e0n ph\u00edm.<\/p>\n<h4 class=\"excel geshifilter-excel\"><span class=\"ez-toc-section\" id=\"Vi_du\"><\/span>V\u00ed d\u1ee5<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>Ta s\u1ebd t\u00ecm ng\u00e0y \u0111\u1ea7u ti\u00ean c\u1ee7a th\u00e1ng \u0111\u1ed1i v\u1edbi nh\u1eefng d\u1eef li\u1ec7u sau \u0111\u00e2y:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-25813\" src=\"http:\/\/blog.ezworkapp.com\/wp-content\/uploads\/2025\/01\/tim-ngay-dau-thang-1.png\" width=\"440\" height=\"132\" title=\"tim-ngay-dau-thang-1\"><\/p>\n<p>Khi \u0111\u00f3, t\u1ea1i \u00f4 B2 \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c ta c\u00f3 nh\u01b0 sau:<\/p>\n<blockquote>\n<p><strong>=A2-DAY(A2)+1<\/strong><\/p>\n<\/blockquote>\n<p>Ho\u1eb7c:<\/p>\n<div class=\"code-block code-block-1\" style=\"margin: 8px 0;clear: both\">\n<div class=\"ad-inserterpro\">\n<a href=\"https:\/\/hocexcel.online\/course\/preview\/ex101-excel-tu-co-ban-den-chuyen-gia-danh-cho-nguoi-di-lam\"><br \/>\n<img decoding=\"async\" src=\"http:\/\/blog.ezworkapp.com\/wp-content\/uploads\/2025\/01\/ex101_92019-nho-1.gif\" title=\"ex101_92019-nho-1\"><br \/>\n<\/a>\n<\/div>\n<\/div>\n<blockquote>\n<p><strong>=\u201d21\/9\/2018\u2033-DAY(\u201c21\/9\/2018\u201d)+1<\/strong><\/p>\n<\/blockquote>\n<p>Sau \u0111\u00f3 s\u1eed d\u1ee5ng Autofill cho nh\u1eefng \u00f4 c\u00f2n l\u1ea1i:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-25814\" src=\"http:\/\/blog.ezworkapp.com\/wp-content\/uploads\/2025\/01\/tim-ngay-dau-thang-2.png\" width=\"461\" height=\"127\" title=\"tim-ngay-dau-thang-2\"><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Su_dung_ham_EOMONTH_de_tim_ngay_dau_thang\"><\/span>S\u1eed d\u1ee5ng h\u00e0m EOMONTH \u0111\u1ec3 t\u00ecm ng\u00e0y \u0111\u1ea7u th\u00e1ng<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ch\u00fang ta \u0111\u1ec1u bi\u1ebft h\u00e0m EOMONTH s\u1ebd tr\u1ea3 v\u1ec1 ng\u00e0y cu\u1ed1i th\u00e1ng. V\u1eady l\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 t\u00ecm ng\u00e0y \u0111\u1ea7u th\u00e1ng v\u1edbi h\u00e0m EOMONTH \u0111\u00e2y? <strong><em>H\u00e3y t\u00ecm ng\u00e0y cu\u1ed1i th\u00e1ng tr\u01b0\u1edbc v\u00e0 c\u1ed9ng v\u1edbi 1.<\/em><\/strong><\/p>\n<p>C\u00f4ng th\u1ee9c c\u1ee7a ta \u0111\u1ed1i v\u1edbi \u00f4 B2 nh\u01b0 sau:<\/p>\n<blockquote>\n<p><strong>=EOMONTH(A2,-1)+1<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-25815\" src=\"http:\/\/blog.ezworkapp.com\/wp-content\/uploads\/2025\/01\/tim-ngay-dau-thang-3.png\" width=\"394\" height=\"128\" title=\"tim-ngay-dau-thang-3\"><\/p>\n<\/blockquote>\n<p>Th\u1eadt \u0111\u01a1n gi\u1ea3n ph\u1ea3i kh\u00f4ng n\u00e0o?<\/p>\n<p>Ngo\u00e0i ra b\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o th\u00eam nh\u1eefng b\u00e0i vi\u1ebft li\u00ean quan:<\/p>\n<p><strong><a href=\"http:\/\/blog.ezworkapp.com\/ham-tim-ngay-cuoi-cung-trong-thang-eomonth-trong-excel.html\">T\u00ecm ng\u00e0y cu\u1ed1i th\u00e1ng v\u1edbi h\u00e0m EOMONTH<\/a><\/strong><\/p>\n<p><a href=\"http:\/\/blog.ezworkapp.com\/cach-dung-ham-weekday-trong-excel.html\"><strong>S\u1eed d\u1ee5ng h\u00e0m WEEKDAY trong Excel<\/strong><\/a><\/p>\n<p><a href=\"http:\/\/blog.ezworkapp.com\/huong-dan-cach-dung-ham-month-trong-excel-de-tim-so-thang.html\"><strong>H\u01b0\u1edbng d\u1eabn t\u00ecm th\u00e1ng v\u1edbi h\u00e0m MONTH<\/strong><\/a><\/p>\n<\/div>\n<div class=\"uk-panel uk-margin uk-width-xlarge\">\n<p>Click \u0111\u0103ng k\u00fd h\u1ecdc t\u1ea1i:<\/p>\n<p><a href=\"http:\/\/blog.ezworkapp.com\/khoa-hoc\" target=\"_blank\" rel=\"noopener\">T\u1ea5t c\u1ea3 kho\u00e1 h\u1ecdc\u00a0<span>\ud83d\udcd6<\/span><\/a><\/p>\n<p><a href=\"http:\/\/blog.ezworkapp.com\/huong-dan-kich-hoat-khoa-hoc-tai-hoc-excel-online.html\" target=\"_blank\" rel=\"noopener\">H\u01b0\u1edbng d\u1eabn k\u00edch ho\u1ea1t<\/a><\/p>\n<p>HKD H\u1ecdc Excel Online<br \/>S\u1ed1 \u0110K: 17A80048102<\/p>\n<\/div>\n<div class=\"uk-panel uk-text-small uk-margin uk-margin-remove-bottom uk-text-center\">\n<p>\u00a9  document.currentScript.insertAdjacentHTML(&#8216;afterend&#8217;, &#8221; + new Intl.DateTimeFormat(document.documentElement.lang, {year: &#8216;numeric&#8217;}).format() + &#8221;);  H\u1ecdc Excel Online. All rights reserved.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<div class=\"ad-inserterpro\">\n<a href=\"https:\/\/hocexcel.online\/course\/preview\/ex101-excel-tu-co-ban-den-chuyen-gia-danh-cho-nguoi-di-lam\"><br \/>\n<img decoding=\"async\" src=\"http:\/\/blog.ezworkapp.com\/wp-content\/uploads\/2025\/01\/ex101_92019-nho-1.gif\"><br \/>\n<\/a>\n<\/div>\n","protected":false},"author":1,"featured_media":9069,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-9068","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-excel-co-ban"],"_links":{"self":[{"href":"https:\/\/blog.ezworkapp.com\/index.php\/wp-json\/wp\/v2\/posts\/9068","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.ezworkapp.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.ezworkapp.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.ezworkapp.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.ezworkapp.com\/index.php\/wp-json\/wp\/v2\/comments?post=9068"}],"version-history":[{"count":0,"href":"https:\/\/blog.ezworkapp.com\/index.php\/wp-json\/wp\/v2\/posts\/9068\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.ezworkapp.com\/index.php\/wp-json\/wp\/v2\/media\/9069"}],"wp:attachment":[{"href":"https:\/\/blog.ezworkapp.com\/index.php\/wp-json\/wp\/v2\/media?parent=9068"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.ezworkapp.com\/index.php\/wp-json\/wp\/v2\/categories?post=9068"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.ezworkapp.com\/index.php\/wp-json\/wp\/v2\/tags?post=9068"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}