How to Convert Epoch Time in Milliseconds to Java 8 OffsetDateTime

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The Java 8 OffsetDateTime represents date-time with an offset from UTC/Greenwich in the ISO-8601 calendar system.

Java 8 OffsetDateTime.ofInstant(Instant.ofEpochMilli(1580232122000L),ZoneId.systemDefault()) function can be used to convert Epoch time in Milliseconds to Java 8 OffsetDateTime object.

This tutorial will teach you different ways to convert Epoch time in milliseconds to OffsetDateTime.

To convert Epoch Time in Milliseconds to Java 8 ZonedDateTime, you can check this tutorial How to convert Epoch time in Milliseconds to Java 8 ZonedDateTime.

Using OffsetDateTime.ofInstant()

The OffsetDateTime.ofInstant() method accepts the Instant value created using Epoch Time in Milliseconds value.
Code

    import java.time.Instant;  
    import java.time.OffsetDateTime;  
    import java.time.ZoneId;

    //main
    OffsetDateTime offsetDateTime = OffsetDateTime.ofInstant(Instant.ofEpochMilli(1580232122000L),ZoneId.systemDefault());  
    System.out.println(offsetDateTime);  //2020-01-28T17:22:02Z

Using Instant.ofEpochMilli()

The Java 8 Instant class provides the offsetDateTime value based on the Epoch millisecond.

Code

    import java.sql.Timestamp;  
    import java.time.Instant;  
    import java.time.LocalDateTime;  
    import java.time.ZoneId;

    //main
    long epochInMilliSeconds = Instant.now().toEpochMilli();  
    System.out.println(epochInMilliSeconds);  //1675018639820

    OffsetDateTime offsetDateTime = Instant.ofEpochMilli(epochInMilliSeconds).atZone(ZoneId.systemDefault()).toOffsetDateTime();  
    System.out.println(offsetDateTime);  //2023-01-29T18:57:19.820Z

In the above example, Instant.ofEpochMilli() accepts the millisecond value along with the timezone and returns the OffsetDateTime value.

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