Make operation on a date in Java

Question

What is the best way to make operation on a util.date Object in java.

For example: I have a date 2018.10.02 and i want to add 3 Month to this date and to get another util.date object with the good date.

The same with adding or substracting day, years or hours...

Thanks

using Calendar class. look at [this](https://stackoverflow.com/a/6186006/3627279) — Joe, Oct 02 '18 at 13:27
I saw this post https://stackoverflow.com/a/23438360/3767862 but i want to get a Date object and not a LocalDate — shmoolki, Oct 02 '18 at 13:28
Always search Stack Overflow before posting. Specifically: Search for [`LocalDate` class with its *plus*](https://duckduckgo.com/?q=site%3Astackoverflow.com+java+LocalDate+plus&t=osx&ia=web) & *minus* methods. — Basil Bourque, Oct 14 '18 at 23:47

xingbin · Accepted Answer · 2018-10-03T01:54:13.190

2

You can use java.time package since java8, for example:

Date date = new Date();

Instant instant = Instant.ofEpochMilli(date.getTime());

ZonedDateTime zonedDateTime = ZonedDateTime.ofInstant(instant, ZoneId.systemDefault());
zonedDateTime = zonedDateTime.plusMonths(3);

Date afterThreeMonth = Date.from(zonedDateTime.toInstant())

edited Oct 03 '18 at 01:54

answered Oct 02 '18 at 13:27

xingbin

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And how can i get back a Date? – shmoolki Oct 02 '18 at 13:28
@shmoolki See the updated answer. – xingbin Oct 02 '18 at 14:15
If using Java 8 or later and indispensably needing an old-fashioned `Date` object for an API that you don’t want to upgrade just now, the following is slightly simpler: `Date.from(zonedDateTime.toInstant())`. – Ole V.V. Oct 02 '18 at 19:23
@OleV.V. thanks :) – xingbin Oct 03 '18 at 01:54

score 2 · Answer 2 · answered Oct 02 '18 at 13:27

2

New class java.time.LocalDate is better for that kind of operations:

    LocalDate date = LocalDate.parse("2018-10-02").plusMonths(3);

answered Oct 02 '18 at 13:27

Benoit

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I need a Util.date on result – shmoolki Oct 02 '18 at 13:29

Make operation on a date in Java

2 Answers2