Package com.github.f4b6a3.uuid.util

Class UuidTime

  • public final class UuidTime
extends Object
    Utility that provides methods related to timestamps.

    • Field Detail

      • GREGORIAN_MILLISECONDS

        public static final long GREGORIAN_MILLISECONDS

    • Method Detail

      • getCurrentTimestamp

        public static long getCurrentTimestamp()
        Get the current timestamp with milliseconds precision. The UUID timestamp is the number of 100-nanos since 1582-10-15 (Gregorian epoch). ### RFC-4122 - 4.2.1.2. System Clock Resolution The timestamp is generated from the system time, whose resolution may be less than the resolution of the UUID timestamp. If UUIDs do not need to be frequently generated, the timestamp can simply be the system time multiplied by the number of 100-nanosecond intervals per system time interval. (4) A high resolution timestamp can be simulated by keeping a count of the number of UUIDs that have been generated with the same value of the system time, and using it to construct the low order bits of the timestamp. The count will range between zero and the number of 100-nanosecond intervals per system time interval.
        Returns:
        the current timestamp

      • toTimestamp

        public static long toTimestamp​(long unixMilliseconds)
        Get the timestamp of a given Unix Epoch milliseconds. The value returned by this method is the number of 100-nanos since 1582-10-15 (Gregorian epoch).
        Parameters:
        unixMilliseconds - the Unix Epoch milliseconds
        Returns:
        the timestamp

      • toUnixMilliseconds

        public static long toUnixMilliseconds​(long timestamp)
        Get the Unix Epoch milliseconds of a given timestmap. The value returned by this method is the number of milliseconds since 1970-01-01 (Unix epoch).
        Parameters:
        timestamp - a timestamp
        Returns:
        the Unix milliseconds

      • toTimestamp

        public static long toTimestamp​(Instant instant)
        Get the timestamp of a given instant. The value returned by this method is the number of 100-nanos since 1582-10-15 (Gregorian epoch).
        Parameters:
        instant - an instant
        Returns:
        the timestamp

      • toInstant

        public static Instant toInstant​(long timestamp)
        Get the instant of the given timestamp.
        Parameters:
        timestamp - a timestamp
        Returns:
        the instant