modify existing date and result would be in same format with java

Question

I have a Date which is coming like this Thu Dec 31 16:00:00 EST 1969.

So i just need to add one day in this so that i will get Thu Jan 01 16:00:00 EST 1970.

any idea with java ?

https://stackoverflow.com/questions/428918/how-can-i-increment-a-date-by-one-day-in-java — Simon B, Apr 23 '19 at 13:09
yes i have tried with Calendar calendar = Calendar.getInstance(); System.out.println(calendar.getTime());// print today's date calendar.add(Calendar.DATE, 1); — Er KK Chopra, Apr 23 '19 at 13:12
Is your question specific to 'Dec 31 16:00:00 EST 1969.' as it is before the clock starts in Java Date object? — J_D, Apr 23 '19 at 13:23
Possible duplicate of [how to add a single day to "dd/mm" format in java](https://stackoverflow.com/questions/38392706/how-to-add-a-single-day-to-dd-mm-format-in-java) — ChristophE, Apr 23 '19 at 13:26
This input string is terrible. Educate the publisher of that data about UTC and about ISO 8601. — Basil Bourque, Apr 23 '19 at 18:16

Lungu Daniel · Accepted Answer · 2019-04-24T06:20:45.293

4

If you use Java 8, you could use ZonedDateTime.

DateTimeFormatter dtf = DateTimeFormatter.ofPattern("EEE MMM dd HH:mm:ss zzz yyyy");

ZonedDateTime zonedDateTime = ZonedDateTime.parse("Wed Dec 31 16:00:00 EST 1969", dtf);
zonedDateTime = zonedDateTime.plusDays(1);

System.out.println(dtf.format(zonedDateTime));

edited Apr 24 '19 at 06:20

answered Apr 23 '19 at 13:26

Lungu Daniel

816
2
8
15

getting java.time.format.DateTimeParseException: Text 'Thu Jan 01 16:00:00 EST 1970' could not be parsed at index 0 – Er KK Chopra Apr 23 '19 at 14:35
@Er KK Chopra, I edited the post, now it should be ok. – Lungu Daniel Apr 23 '19 at 17:03
1

**Incorrect.** `LocalDateTime` is precisely the *wrong* class to be using here. That class cannot be used to represent a moment. That class purposely ignores time zones. So your results will be incorrect when failing to account for anomalies such as Daylight Saving Time (DST). Use `ZonedDateTime`. – Basil Bourque Apr 23 '19 at 18:15
Thanks @BasilBourque for your remark, I changed the solution. – Lungu Daniel Apr 24 '19 at 06:22

modify existing date and result would be in same format with java

1 Answers1