Instant class java

In Java, the Instant class is a part of the java.time package and represents a specific point in time with nanosecond precision. It is used to represent a moment on the timeline in the ISO-8601 calendar system, with the same meaning as the ZonedDateTime class, but without any time zone information.

An Instant object can be created using the ofEpochMilli() or ofEpochSecond() factory methods, which take the number of milliseconds or seconds since the epoch (midnight, January 1, 1970 UTC) as an argument. For example:

Instant instant = Instant.ofEpochMilli(1592608000000L);  // 2020-06-23T00:00:00Z

The Instant class also provides methods for comparing, formatting, and parsing Instant objects, as well as for converting them to other date and time types.

For example, you can use the format() method to convert an Instant object to a formatted string:

Instant instant = Instant.now();
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
String formatted = instant.format(formatter);  // e.g. "2022-12-22T15:38:34.123Z"

You can also use the atZone() method to convert an Instant object to a ZonedDateTime object in a specific time zone:

Instant instant = Instant.now();
ZonedDateTime zoned = instant.atZone(ZoneId.of("Europe/Paris"));

For more information on the Instant class in Java, you can refer to the Java documentation.