How to convert Datetime to Unix timestamp in Java

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    import java.time.LocalDateTime;
    import java.time.ZoneOffset;
    
    public class DateToUnixTimestamp {
        public static void main(String[] args) {
            // Create a LocalDateTime object for a specific date and time
            LocalDateTime dateTime = LocalDateTime.of(2013, 10, 28, 07, 11, 29);
    
            // Convert the LocalDateTime to Unix timestamp (seconds since the epoch)
            long unixTimestamp = dateTime.toEpochSecond(ZoneOffset.UTC);
    
            // Print the Unix timestamp
            System.out.println("Unix Timestamp: " + unixTimestamp);
        }
    }

Output:

Unix Timestamp: 1382944289

Example only. There may be multiple ways to perform this operation.

Code Explanation

In this Java snippet, the LocalDateTime.of() method is used to create a LocalDateTime object representing the specific date and time (2013-10-28 07:11:29).
The toEpochSecond() method is then called on this LocalDateTime object, with ZoneOffset.UTC passed as an argument to ensure that the conversion is based on UTC time.

Convert Unix timestamp to Date in Java

Other useful Java date functions

Function	Description	Example
`LocalDate.now()`	Returns the current date in the format 'YYYY-MM-DD'.	`LocalDate.now()` returns 2024-08-28
`LocalTime.now()`	Returns the current time in the format 'HH:mm:ss'.	`LocalTime.now()` returns 12:34:56
`LocalDateTime.now()`	Returns the current date and time in the format 'YYYY-MM-DDTHH:mm:ss'.	`LocalDateTime.now()` returns 2024-08-28T12:34:56
`Instant.now()`	Returns the current timestamp in UTC.	`Instant.now()` returns 2024-08-28T12:34:56Z
`LocalDate.parse()`	Parses a string to create a LocalDate object.	`LocalDate.parse("2024-08-28")` returns 2024-08-28
`LocalDateTime.parse()`	Parses a string to create a LocalDateTime object.	`LocalDateTime.parse("2024-08-28T12:34:56")` returns 2024-08-28T12:34:56
`LocalDateTime.of()`	Creates a LocalDateTime from specified date and time values.	`LocalDateTime.of(2024, 8, 28, 12, 34, 56)` returns 2024-08-28T12:34:56
`Instant.ofEpochMilli()`	Converts milliseconds since Unix epoch to an Instant.	`Instant.ofEpochMilli(1693227296789L)` returns 2024-08-28T12:34:56.789Z
`Instant.ofEpochSecond()`	Converts seconds since Unix epoch to an Instant.	`Instant.ofEpochSecond(1693227296L)` returns 2024-08-28T12:34:56Z
`LocalDateTime.toEpochSecond()`	Converts a LocalDateTime to Unix timestamp (seconds since epoch) with specified time zone.	`LocalDateTime.now().toEpochSecond(ZoneOffset.UTC)` returns 1693227296
`LocalDateTime.format()`	Formats the LocalDateTime using a DateTimeFormatter.	`LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"))` returns 2024-08-28 12:34:56
`ZonedDateTime.now()`	Returns the current date and time with the time zone information.	`ZonedDateTime.now()` returns 2024-08-28T12:34:56+02:00[Europe/Paris]

Current Unix Timestamp SECONDS SINCE JAN 01 1970

Current UTC Time

2025-08-20