PaulG PaulG - 4 months ago 19
Java Question

How do I get milliseconds from epoch (1970-01-01) in Java?

I need to get the number of milliseconds from 1970-01-01 UTC until now UTC in Java.

I would also like to be able to get the number of milliseconds from 1970-01-01 UTC to any other UTC date time.

Answer

How about System.currentTimeMillis()?

From the JavaDoc:

Returns: the difference, measured in milliseconds, between the current time and midnight, January 1, 1970 UTC

Java 8 introduces the java.time framework, particularly the Instant class which "...models a ... point on the time-line...":

long now = Instant.now().toEpochMilli();

Returns: the number of milliseconds since the epoch of 1970-01-01T00:00:00Z -- i.e. pretty much the same as above :-)

Cheers,

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