{"id":27535,"date":"2022-12-24T23:43:27","date_gmt":"2022-12-24T18:13:27","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-java-8-calculate-how-many-1st-of-the-months-between-two-dates\/"},"modified":"2022-12-24T23:43:27","modified_gmt":"2022-12-24T18:13:27","slug":"solved-java-8-calculate-how-many-1st-of-the-months-between-two-dates","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-java-8-calculate-how-many-1st-of-the-months-between-two-dates\/","title":{"rendered":"[Solved] Java 8 calculate how many 1st of the months between two dates"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-71476973\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"71476973\" data-parentid=\"71472115\" data-score=\"2\" 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<h1>tl;dr<\/h1>\n<pre><code>LocalDate.parse( \"2022-03-14\" ).datesUntil( LocalDate.parse( \"2022-04-15\" ) ).filter( localDate -&gt; localDate.getDayOfMonth() == 1 ).count()\n<\/code><\/pre>\n<p>See this <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/ideone.com\/UGPJFX\">code run live at IdeOne.com<\/a>.<\/p>\n<blockquote>\n<p>1<\/p>\n<\/blockquote>\n<h1>Details<\/h1>\n<p>First, parse the inputs as <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/docs.oracle.com\/en\/java\/javase\/17\/docs\/api\/java.base\/java\/time\/LocalDate.html\"><code>LocalDate<\/code><\/a> objects.<\/p>\n<pre class=\"lang-java prettyprint-override\"><code>LocalDate start = LocalDate.parse( \"2022-03-14\" );\nLocalDate end = LocalDate.parse( \"2022-04-15\" );\n<\/code><\/pre>\n<p>The <code>LocalDate#datesUntil<\/code> method creates a stream of <code>LocalDate<\/code> objects between the two values. We can filter that stream to keep only the ones whose day-of-month is 1 (the first of the month). Then we ask for a count of those filtered objects.<\/p>\n<pre class=\"lang-java prettyprint-override\"><code>long countFirstOfMonths =\n        start\n                .datesUntil( end )\n                .filter( localDate -&gt; localDate.getDayOfMonth() == 1 )\n                .count();\n<\/code><\/pre>\n<p>Report.<\/p>\n<pre class=\"lang-java prettyprint-override\"><code>String message = String.format( \"From %s to %s contains %d first-of-month dates.\" , start.toString() , end.toString() , countFirstOfMonths );\nSystem.out.println( message );\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Java 8 calculate how many 1st of the months between two dates <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] tl;dr LocalDate.parse( &#8220;2022-03-14&#8221; ).datesUntil( LocalDate.parse( &#8220;2022-04-15&#8221; ) ).filter( localDate -&gt; localDate.getDayOfMonth() == 1 ).count() See this code run live at IdeOne.com. 1 Details First, parse the inputs as LocalDate objects. LocalDate start = LocalDate.parse( &#8220;2022-03-14&#8221; ); LocalDate end = LocalDate.parse( &#8220;2022-04-15&#8221; ); The LocalDate#datesUntil method creates a stream of LocalDate objects between the two &#8230; <a title=\"[Solved] Java 8 calculate how many 1st of the months between two dates\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-java-8-calculate-how-many-1st-of-the-months-between-two-dates\/\" aria-label=\"More on [Solved] Java 8 calculate how many 1st of the months between two dates\">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":[323,549],"class_list":["post-27535","post","type-post","status-publish","format-standard","hentry","category-solved","tag-java","tag-java-8"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Java 8 calculate how many 1st of the months between two dates - 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-java-8-calculate-how-many-1st-of-the-months-between-two-dates\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Java 8 calculate how many 1st of the months between two dates - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] tl;dr LocalDate.parse( &quot;2022-03-14&quot; ).datesUntil( LocalDate.parse( &quot;2022-04-15&quot; ) ).filter( localDate -&gt; localDate.getDayOfMonth() == 1 ).count() See this code run live at IdeOne.com. 1 Details First, parse the inputs as LocalDate objects. LocalDate start = LocalDate.parse( &quot;2022-03-14&quot; ); LocalDate end = LocalDate.parse( &quot;2022-04-15&quot; ); The LocalDate#datesUntil method creates a stream of LocalDate objects between the two ... 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