How to get year, month, day from a String format in Java

Question

I am working on a piece of work where I need to get year, month, day from a String in Java. The string is like that: 20170119T163048

Where 2017 is year, 01 is month, 19 is day, 16:30:48 is time.

I implemented code like this below:

public void convertStringToDate (String string) {
    String dateInString = "";   
    SimpleDateFormat formatter = new SimpleDateFormat();
    Date date = formatter.parse("20170119T163048");
    System.out.println(date);
}

But seems like it does not work. Looking around and I actually found quite lots of similar answer but none of them really work for me so...

Try the format along the lines of `yyyyMMdd'T'HHmmSS` - or better yet, make use of the newer Date/Time API - for [example](http://stackoverflow.com/questions/18119665/geting-duration-of-2-times/18120233#18120233) — MadProgrammer, Jan 20 '17 at 02:02
Abd the more general dupe: [Java string to date conversion](//stackoverflow.com/q/4216745) — Tom, Jan 20 '17 at 02:09
`LocalDateTime.parse( "20170119T163048" , DateTimeFormatter.ofPattern( "uuuuMMdd'T'HHmmss" ) ).getYear()` & `.getMonthValue()` & `.getDayOfMonth()`. — Basil Bourque, Feb 16 '18 at 21:16

score 5 · Accepted Answer · edited Jan 14 '20 at 10:36

5

You Shall always refer to the documentation.Simple Date Format Documentation

public static void main(String[] args) throws Exception{
    SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd'T'HHmmss");
    Date date = formatter.parse("20170119T163048");
    System.out.println(date.toString());
}

edited Jan 14 '20 at 10:36

djm.im

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answered Jan 20 '17 at 02:02

Srikanth Balaji

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Oh it works, thanks. But may I know what is the 'T'? I think it was the main part that makes me feel confused. – Long Dao Jan 20 '17 at 02:07
'T' denotes time in your time format string. Always worth going through the Official documentation - https://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html – Srikanth Balaji Jan 20 '17 at 02:10
Actually, in the context of the format 'T' means a literal, it expects to find 'T' at this point in the format. For the ISO format, 'T' is the time separator. The new Date/Time API have a number of ISO formats readily available ;) – MadProgrammer Jan 20 '17 at 02:17
wow a lot of upvotes for this answer – Scary Wombat Jan 20 '17 at 02:18
@ScaryWombat, yes, for a very straight forward question – Srikanth Balaji Jan 20 '17 at 02:20

How to get year, month, day from a String format in Java

1 Answers1