Validating date format in java

21-Nov-2015 14:31 by squall21 2 Comments

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Feb.2011 = Sat Feb 19 CET 2011 4/20/2012 = Fri Apr 20 CEST 2012 some string = null 123456 = null null = null Thus you can quickly check weather given string is a valid Date or not using Date Util class.Many developers have commented on this post about the issue of Thread safety in this code snippet.

M.yyyy")); add(new Simple Date Format("M/dd/yyyy hh:mm:ss a")); add(new Simple Date Format("dd. MMM.yyyy")); add(new Simple Date Format("dd-MMM-yyyy")); } }; /** * Convert String with various formats into List; public class Date Util { // List of all date formats that we want to parse. private static List() {{ add(new Simple Date Format("M/dd/yyyy")); add(new Simple Date Format("dd.If it fails to convert String to Date then it returns null.Let’s test this with various input: package; public class Test Date Util { public static void main(String[] args) { println("10/14/2012" + " = " + Date Util.convert To Date("10/14/2012")); println("10-Jan-2012" + " = " + Date Util.convert To Date("10-Jan-2012")); println("" + " = " + Date Util.convert To Date("")); println("12/03/2010" + " = " + Date Util.convert To Date("12/03/2010")); println("19. Feb.2011" )); println("4/20/2012" + " = " + Date Util.convert To Date("4/20/2012")); println("some string" + " = " + Date Util.convert To Date("some string")); println("123456" + " = " + Date Util.convert To Date("123456")); println("null" + " = " + Date Util.convert To Date(null)); } } 10/14/2012 = Sun Oct 14 CEST 2012 10-Jan-2012 = Tue Jan 10 CET 2012 = Fri Mar 01 CET 2002 12/03/2010 = Fri Dec 03 CET 2010 19.In this regex tutorial, we will learn to validate simple date formats e.g. Here, we want to use a regex that simply checks whether the input looks like a date, without trying to eliminate things such as February 31st.You might think that something as conceptually trivial as a date should be an easy job for a regular expression. The main issue is that regular expressions don’t deal directly with numbers.

You can’t tell a regular expression to “match a number between 1 and 31”.

Rather regular expressions work character by character. [1-9]› to match 3 followed by 0 or 1, or to match 1 or 2 followed by any digit, or to match an optional 0 followed by 1 to 9. [0-9]{2}$"; Pattern pattern = Pattern.compile(regex); for(String date : dates) { Matcher matcher = pattern.matcher(date); println(date +" : "+ matcher.matches()); } Output: 1/1/11 : true 01/01/11 : true 01/01/2011 : true 01/1/2011 : true 1/11/2011 : true 1/11/11 : true 11/1/11 : true List dates = new Array List(); //With leading zeros dates.add("01/01/11"); dates.add("01/01/2011"); //Missing leading zeros dates.add("1/1/11"); dates.add("01/1/2011"); dates.add("1/11/2011"); dates.add("1/11/11"); dates.add("11/1/11"); String regex = "^[0-3][0-9]/[0-3][0-9]/(?

Because of this, you have to choose how simple or how accurate you want your regular expression to be.

Let’s see some regex examples based on different requirements around date formats List dates = new Array List(); dates.add("1/1/11"); dates.add("01/01/11"); dates.add("01/01/2011"); dates.add("01/1/2011"); dates.add("1/11/2011"); dates.add("1/11/11"); dates.add("11/1/11"); String regex = "^[0-3]?

Now in Java you can convert a String to Date using Simple Date Format class. In any of such case we should get a valid package; import Date object if input string is parsed * successfully else returns null */ public static Date convert To Date(String input) { Date date = null; if(null == input) { return null; } for (Simple Date Format format : date Formats) { try { Lenient(false); date = format.parse(input); } catch (Parse Exception e) { //Shhh.. If it is successful in converting String to Date, it returns the Date object.

User might enter date in format “dd/mm/yyy” or “dd-mm-yyyy” or “yy”! Date * * @param input * Date as a string * @return It runs through each format from the list and check weather input string is valid date or not.

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