How to get milliseconds from LocalDateTime in Java

How to get milliseconds from LocalDateTime in Java

In Java, you can get the number of milliseconds from a LocalDateTime object by converting it to an Instant and then extracting the milliseconds from that Instant. Here's how you can do it:

import java.time.Instant; import java.time.LocalDateTime; public class MillisecondsFromLocalDateTime { public static void main(String[] args) { // Create a LocalDateTime LocalDateTime localDateTime = LocalDateTime.now(); // Convert LocalDateTime to Instant Instant instant = localDateTime.atZone(ZoneId.systemDefault()).toInstant(); // Get the milliseconds from the Instant long milliseconds = instant.toEpochMilli(); System.out.println("Milliseconds: " + milliseconds); } }

In this example:

  1. We create a LocalDateTime object representing the current date and time using LocalDateTime.now().

  2. We convert the LocalDateTime to an Instant by calling atZone(ZoneId.systemDefault()).toInstant(). The atZone method is used to specify the time zone (in this case, ZoneId.systemDefault() represents the system's default time zone).

  3. We use the toEpochMilli() method on the Instant to get the number of milliseconds since the Unix epoch (January 1, 1970, at midnight UTC).

Now, the milliseconds variable contains the number of milliseconds from the LocalDateTime.

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