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How to format FileTime in Java

July 22, 2020 by mkyong

In Java, we can use DateTimeFormatter to convert the FileTime to other custom date formats. public static String formatDateTime(FileTime fileTime) { LocalDateTime localDateTime = fileTime .toInstant() .atZone(ZoneId.systemDefault()) .toLocalDateTime(); return localDateTime.format( DateTimeFormatter.ofPattern("MM/dd/yyyy HH:mm:ss")); } 1. File Last Modified Time This example displays the last modified time of a file in a custom date format. GetLastModifiedTime.java package …

How to check if date is valid in Java

November 3, 2020February 20, 2012 by mkyong

This article shows how to use the Java 8 DateTimeFormatter to check if a date format is valid in Java. Below are the requirements for a valid date. Year format, 1900, 2099 Month format, 1, 01, 2, 02… 12 Day format, 1, 01… 31 Leap year, February 29 days. Common year, February 28 days. Month …

Java regex validate date format examples

November 3, 2020November 17, 2009 by mkyong

This article shows how to use regex + code to validate a date format, support single and leading zero month and day format (1 or 01), check for the 30 or 31 days of the month, and leap year validation. Below are the requirements for a valid date. Year format, 1900, 2099 regex Month format, …