Joda DateTime to Unix DateTime

Question

It's odd enough, but I didn't find any result about converting Joda(Time) DateTime to Unix DateTime (or timestamp, whichever is the correct name). How can I do this?

score 92 · Accepted Answer · edited Sep 15 '20 at 15:01

Any object that inherits from BaseDateTime (including DateTime) has the method

public long getMillis()

According to the API it:

Gets the milliseconds of the datetime instant from the Java epoch of 1970-01-01T00:00:00Z.

So a working example to get the seconds would simply be:

new DateTime().getMillis() / 1000

For completeness, the definition of the Unix Timestamp according to Wikipedia:

Unix time, or POSIX time, is a system for describing instants in time, defined as the number of seconds that have elapsed since 00:00:00 Coordinated Universal Time (UTC), Thursday, 1 January 1970, not counting leap seconds.

You can also improve it further by removing the magic number division using the TimeUnit API:

import java.util.concurrent.TimeUnit;

TimeUnit.MILLISECONDS.toSeconds(new DateTime().getMillis());

Suggested improvement to get rid of the constant. ` TimeUnit.MILLISECONDS.toSeconds(new DateTime().getMillis())` — Synesso, Jun 27 '19 at 06:04

score 5 · Answer 2 · edited Apr 22 '18 at 07:03

5

Java 8 added a new API for working with dates and times. With Java 8 you can use

long unixTimestamp = Instant.now().getEpochSecond();

edited Apr 22 '18 at 07:03

OneCricketeer

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answered Jan 12 '16 at 10:21

Navrattan Yadav

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It is question about Joda DateTime, how is this relevant? – Ivan Marjanovic Apr 06 '16 at 10:24
6

Yes it is, he uses and links to joda's `DateTime` in the answer. – Stephen Carman Apr 19 '16 at 15:01
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Nice line of code. Has nothing to do with the question. – refaelio Jan 21 '19 at 15:17
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How does this answer have upvotes? Literally not an answer to the question. – Andrew Koster Nov 19 '19 at 20:51
it does the work – Aadam Jan 09 '22 at 23:36

score 0 · Answer 3 · answered Jul 09 '20 at 20:30

0

    @Test
    public void covertDateTimeToEpoch() {
        DateTime dateTime = DateTime.parse("2020-07-09T04:30:45.781Z");
        long epochMilli = dateTime.toDate().toInstant().toEpochMilli();
        assertEquals(1594269045781L, epochMilli);
    }

answered Jul 09 '20 at 20:30

TechPassionate

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Joda DateTime to Unix DateTime

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