Java Convert LocalTime to Epoch Seconds

Tags: Java LocalTime Java 8

Epoch seconds means the number of seconds since the epoch of 1970-01-01T00:00:00Z. In this Java core tutorial we learn how to convert a java.time.LocalTime object with a given LocalDate object into number of epoch seconds.

How to convert LocalTime into Epoch Seconds in Java

With a given LocalTime object in Java, we can use the toEpochSecond() method with a specified LocalDate object and time zone to convert LocalTime to number of epoch seconds as the following example Java code.

ConvertLocalTimeToEpochSecondsExample1.java 

import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalTime;
import java.time.ZoneId;
import java.time.ZoneOffset;

public class ConvertLocalTimeToEpochSecondsExample1 {
    public static void main(String... args) {
        int hour = 1;
        int minute = 10;
        int second = 20;

        LocalTime localTime = LocalTime.of(hour, minute, second);
        LocalDate today = LocalDate.now();
        ZoneOffset offset = ZoneId.systemDefault().getRules().getOffset(Instant.now());

        long epochSeconds = localTime.toEpochSecond(today, offset);

        System.out.println("LocalTime: " + localTime);
        System.out.println("Epoch Seconds: " + epochSeconds);
    }
}
The output as below. 
LocalTime: 01:10:20
Epoch Seconds: 1650478220

The following Java program to show more example using LocalTime.toEpochSecond() method with UTC time zone.

ConvertLocalTimeToEpochSecondsExample2.java 

import java.time.LocalDate;
import java.time.LocalTime;
import java.time.ZoneOffset;

public class ConvertLocalTimeToEpochSecondsExample2 {
    public static void main(String... args) {
        int hour = 1;
        int minute = 10;
        int second = 20;

        LocalTime localTime = LocalTime.of(hour, minute, second);

        long epochSeconds = localTime.toEpochSecond(LocalDate.now(), ZoneOffset.UTC);

        System.out.println("LocalTime: " + localTime);
        System.out.println("Epoch Seconds: " + epochSeconds);
    }
}
The output as below. 
LocalTime: 01:10:20
Epoch Seconds: 1650503420

Happy Coding 😊

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