{"id":5014,"date":"2022-08-25T22:40:09","date_gmt":"2022-08-25T17:10:09","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-mysql-how-to-perform-custom-month-difference-between-two-dates-in-mysql\/"},"modified":"2022-08-25T22:40:09","modified_gmt":"2022-08-25T17:10:09","slug":"solved-mysql-how-to-perform-custom-month-difference-between-two-dates-in-mysql","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-mysql-how-to-perform-custom-month-difference-between-two-dates-in-mysql\/","title":{"rendered":"[Solved] MYSQL How to perform custom month difference between two dates in MYSQL?"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-53700275\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"53700275\" data-parentid=\"53699785\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>I think this query will do what you want. It uses<\/p>\n<pre><code>  (YEAR(CURDATE())*12+MONTH(CURDATE()))\n- (YEAR(STR_TO_DATE(join_date, '%d-%m-%Y'))*12+MONTH(STR_TO_DATE(join_date, '%d-%m-%Y'))) -\n- 1\n<\/code><\/pre>\n<p>to get the number of whole months of experience for the user,<\/p>\n<pre><code>  DAY(LAST_DAY(STR_TO_DATE(join_date, '%d-%m-%Y')))\n- DAY(STR_TO_DATE(join_date, '%d-%m-%Y'))\n+ 1\n<\/code><\/pre>\n<p>to get the number of days in the first month, and<\/p>\n<pre><code>DAY(CURDATE())\n<\/code><\/pre>\n<p>to get the number of days in the current month. The two day counts are summed and if the total is &gt; 15, 1 is added to the number of whole months e.g.<\/p>\n<pre><code>SELECT id\n     , name\n     , (YEAR(CURDATE())*12+MONTH(CURDATE())) - (YEAR(STR_TO_DATE(join_date, '%d-%m-%Y'))*12+MONTH(STR_TO_DATE(join_date, '%d-%m-%Y'))) - 1 -- whole months\n       + CASE WHEN DAY(LAST_DAY(STR_TO_DATE(join_date, '%d-%m-%Y'))) - DAY(STR_TO_DATE(join_date, '%d-%m-%Y')) + 1 + DAY(CURDATE()) &gt; 15 THEN 1 ELSE 0 END -- broken month\n       AS months\nFROM user\n<\/code><\/pre>\n<p>We can use this expression as a <code>JOIN<\/code> condition between <code>user<\/code> and <code>allowed_exp_range<\/code> to find all users who have experience within a given range:<\/p>\n<pre><code>SELECT u.id\n     , u.name\n     , a.starting_exp_months\n     , a.end_exp_months\nFROM user u\nJOIN allowed_exp_range a\nON (YEAR(CURDATE())*12+MONTH(CURDATE())) - (YEAR(STR_TO_DATE(u.join_date, '%d-%m-%Y'))*12+MONTH(STR_TO_DATE(u.join_date, '%d-%m-%Y'))) - 1\n       + CASE WHEN DAY(LAST_DAY(STR_TO_DATE(u.join_date, '%d-%m-%Y'))) - DAY(STR_TO_DATE(u.join_date, '%d-%m-%Y')) + 1 + DAY(CURDATE()) &gt; 15 THEN 1 ELSE 0 END\n       BETWEEN a.starting_exp_months AND a.end_exp_months\n<\/code><\/pre>\n<p>Output (for your sample data, includes all users as they all fit into one of the experience ranges):<\/p>\n<pre><code>id  name    starting_exp_months     end_exp_months\n1   Sam     9                       24\n2   Moe     9                       24\n3   Tim     0                       6\n4   Sal     9                       24\n5   Joe     0                       6\n<\/code><\/pre>\n<p>I&#8217;ve created a small <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/dbfiddle.uk\/?rdbms=mysql_8.0&amp;fiddle=2ee978e6d8284025a98dde8eec373524\">demo on dbfiddle<\/a> which demonstrates the steps in arriving at the result.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">3<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved MYSQL How to perform custom month difference between two dates in MYSQL? <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] I think this query will do what you want. It uses (YEAR(CURDATE())*12+MONTH(CURDATE())) &#8211; (YEAR(STR_TO_DATE(join_date, &#8216;%d-%m-%Y&#8217;))*12+MONTH(STR_TO_DATE(join_date, &#8216;%d-%m-%Y&#8217;))) &#8211; &#8211; 1 to get the number of whole months of experience for the user, DAY(LAST_DAY(STR_TO_DATE(join_date, &#8216;%d-%m-%Y&#8217;))) &#8211; DAY(STR_TO_DATE(join_date, &#8216;%d-%m-%Y&#8217;)) + 1 to get the number of days in the first month, and DAY(CURDATE()) to get the number &#8230; <a title=\"[Solved] MYSQL How to perform custom month difference between two dates in MYSQL?\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-mysql-how-to-perform-custom-month-difference-between-two-dates-in-mysql\/\" aria-label=\"More on [Solved] MYSQL How to perform custom month difference between two dates in MYSQL?\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[433,1201,340],"class_list":["post-5014","post","type-post","status-publish","format-standard","hentry","category-solved","tag-date","tag-date-difference","tag-mysql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] MYSQL How to perform custom month difference between two dates in MYSQL? - JassWeb<\/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:\/\/jassweb.com\/solved\/solved-mysql-how-to-perform-custom-month-difference-between-two-dates-in-mysql\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] MYSQL How to perform custom month difference between two dates in MYSQL? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] I think this query will do what you want. It uses (YEAR(CURDATE())*12+MONTH(CURDATE())) - (YEAR(STR_TO_DATE(join_date, &#039;%d-%m-%Y&#039;))*12+MONTH(STR_TO_DATE(join_date, &#039;%d-%m-%Y&#039;))) - - 1 to get the number of whole months of experience for the user, DAY(LAST_DAY(STR_TO_DATE(join_date, &#039;%d-%m-%Y&#039;))) - DAY(STR_TO_DATE(join_date, &#039;%d-%m-%Y&#039;)) + 1 to get the number of days in the first month, and DAY(CURDATE()) to get the number ... 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It uses (YEAR(CURDATE())*12+MONTH(CURDATE())) - (YEAR(STR_TO_DATE(join_date, '%d-%m-%Y'))*12+MONTH(STR_TO_DATE(join_date, '%d-%m-%Y'))) - - 1 to get the number of whole months of experience for the user, DAY(LAST_DAY(STR_TO_DATE(join_date, '%d-%m-%Y'))) - DAY(STR_TO_DATE(join_date, '%d-%m-%Y')) + 1 to get the number of days in the first month, and DAY(CURDATE()) to get the number ... 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