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PaulG
PaulG

Reputation: 7102

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.

Upvotes: 112

Views: 184769

Answers (4)

Anders R. Bystrup
Anders R. Bystrup

Reputation: 16050

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 :-)

Upvotes: 213

Hari Rao
Hari Rao

Reputation: 3240

You can also try 

  Calendar calendar = Calendar.getInstance();
  System.out.println(calendar.getTimeInMillis());

getTimeInMillis() - the current time as UTC milliseconds from the epoch

Upvotes: -2

Przemek Piotrowski
Przemek Piotrowski

Reputation: 7456

java.time

Using the java.time framework built into Java 8 and later.

import java.time.Instant;

Instant.now().toEpochMilli(); //Long = 1450879900184
Instant.now().getEpochSecond(); //Long = 1450879900

This works in UTC because Instant.now() is really call to Clock.systemUTC().instant()

https://docs.oracle.com/javase/8/docs/api/java/time/Instant.html

Upvotes: 62

Alexander Pavlov
Alexander Pavlov

Reputation: 32286

Also try System.currentTimeMillis()

Upvotes: 17

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