Convert ISO 8601 timestamp string to epoch seconds in Java

Question

I am receiving a string in ISO 8601 date-time format 2020-11-03T15:23:24.388Z. What is the best way to convert this into epoch seconds in Java?

Answer 1

Using the modern date-time API, you can do it as shown below:

import java.time.Instant;

public class Main {
    public static void main(String[] args) {
        Instant instant = Instant.parse("2020-11-03T15:23:24.388Z");
        long seconds = instant.getEpochSecond();
        System.out.println(seconds);
    }
}

Output:

1604417004

If you are doing it for your Android project and your Android API level is still not compliant with Java-8, check Java 8+ APIs available through desugaring and How to use ThreeTenABP in Android Project.

Learn more about the modern date-time API at Trail: Date Time.