{"id":14423,"date":"2022-10-07T18:42:01","date_gmt":"2022-10-07T13:12:01","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-simpledateformat-and-not-allowing-it-to-go-above-12-hours-closed\/"},"modified":"2022-10-07T18:42:01","modified_gmt":"2022-10-07T13:12:01","slug":"solved-simpledateformat-and-not-allowing-it-to-go-above-12-hours-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-simpledateformat-and-not-allowing-it-to-go-above-12-hours-closed\/","title":{"rendered":"[Solved] SimpleDateFormat and not allowing it to go above 12 hours [closed]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-43166234\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"43166234\" data-parentid=\"43165422\" data-score=\"0\" 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>You are experiencing <code>SimpleDateFormat<\/code> behaving as designed. It\u2019s a behaviour that comes as a negative surprise to most.<\/p>\n<p>There are two solutions: the recommended one and the discouraged one.<\/p>\n<p><strong>Recommended solution: LocalTime<\/strong><\/p>\n<pre><code>        DateTimeFormatter timeFormat = DateTimeFormatter.ofPattern(\"hh:mm a\", Locale.ROOT);\n        try {\n            LocalTime lt = LocalTime.parse(startTime, timeFormat);\n            startTime = lt.format(timeFormat);\n            System.out.println(startTime);\n        } catch (DateTimeParseException e) {\n            System.out.println(\"Not a valid time. Please use this format (HH:MM AM)\");\n        }\n<\/code><\/pre>\n<p><code>LocalTime<\/code> and a bunch of other better designed and more programmer-friendly classes were introduced in Java 8. If you cannot use Java 8, there are again two solutions: (1) Resort to the discouraged solution, see below. (2) Use the backport of the Java 8 date and time classes to Java 6 and 7: <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/www.threeten.org\/threetenbp\/\">ThreeTen Backport<\/a> (I haven\u2019t got experience with ThreeTen Backport).<\/p>\n<p>In the code, please specify the correct locale instead of <code>Locale.ROOT<\/code>. I don\u2019t know whether AM and PM may have other names in some locales, so I would want to make sure we are using a locale that agrees with the user input on this point.<\/p>\n<p><strong>Discouraged solution: setLenient()<\/strong><\/p>\n<pre><code>    SimpleDateFormat sdf = new SimpleDateFormat(\"hh:mm aa\");\n    sdf.setLenient(false);\n<\/code><\/pre>\n<p>The <code>SimpleDateFormat<\/code> is <em>lenient<\/em> as default and accepts 09:63 as 10:03 and 14:00 AM as 02:00 PM. When you <code>setLenient(false)<\/code>, it will no longer accept out-of-range values this way, but will throw a <code>ParseException<\/code> as you had expected.<\/p>\n<p><strong>Just checking if the format is correct<\/strong><\/p>\n<p>In either solution, the best way to check the format is what you are already doing: you try to parse it and catch the relevant exception type. Only don\u2019t just catch <code>Exception<\/code>, be specific since exceptions may come of many other causes. That is, catch <code>DateTimeParseException<\/code> with the recommended solution and <code>ParseException<\/code> with the discouraged solution.<\/p>\n<p>Also, if you want to store the time for use later, it is probably more convenient and object-oriented to store it as a <code>LocalTime<\/code> (or what class best reflects your needs) rather than <code>String<\/code>.<\/p>\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 SimpleDateFormat and not allowing it to go above 12 hours [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] You are experiencing SimpleDateFormat behaving as designed. It\u2019s a behaviour that comes as a negative surprise to most. There are two solutions: the recommended one and the discouraged one. Recommended solution: LocalTime DateTimeFormatter timeFormat = DateTimeFormatter.ofPattern(&#8220;hh:mm a&#8221;, Locale.ROOT); try { LocalTime lt = LocalTime.parse(startTime, timeFormat); startTime = lt.format(timeFormat); System.out.println(startTime); } catch (DateTimeParseException e) { &#8230; <a title=\"[Solved] SimpleDateFormat and not allowing it to go above 12 hours [closed]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-simpledateformat-and-not-allowing-it-to-go-above-12-hours-closed\/\" aria-label=\"More on [Solved] SimpleDateFormat and not allowing it to go above 12 hours [closed]\">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":[433,595,323,1362,636],"class_list":["post-14423","post","type-post","status-publish","format-standard","hentry","category-solved","tag-date","tag-format","tag-java","tag-simpledateformat","tag-time"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>[Solved] SimpleDateFormat and not allowing it to go above 12 hours [closed] - 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-simpledateformat-and-not-allowing-it-to-go-above-12-hours-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] SimpleDateFormat and not allowing it to go above 12 hours [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You are experiencing SimpleDateFormat behaving as designed. It\u2019s a behaviour that comes as a negative surprise to most. There are two solutions: the recommended one and the discouraged one. Recommended solution: LocalTime DateTimeFormatter timeFormat = DateTimeFormatter.ofPattern(&quot;hh:mm a&quot;, Locale.ROOT); try { LocalTime lt = LocalTime.parse(startTime, timeFormat); startTime = lt.format(timeFormat); System.out.println(startTime); } catch (DateTimeParseException e) { ... 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