com.github.f4b6a3.uuid.util

Class TimestampUtil

java.lang.Object

com.github.f4b6a3.uuid.util.TimestampUtil

public class TimestampUtil
extends Object

Class that provides methods related to timestamps. All its public methods have milliseconds precision.

Field Summary

Fields

Modifier and Type	Field and Description
static long	GREGORIAN_MILLISECONDS
static long	MILLISECONDS_PER_SECOND
static long	TIMESTAMP_RESOLUTION

Method Summary

Modifier and Type	Method and Description
static long	getCurrentTimestamp() Get the current timestamp with milliseconds precision.
static Instant	toInstant(long timestamp) Get the instant of the given timestamp with milliseconds precision.
static long	toTimestamp(Instant instant) Get the timestamp of a given instant with milliseconds precision.
static long	toTimestamp(long unixMilliseconds) Get the timestamp of a given Unix Epoch milliseconds.
static long	toUnixMilliseconds(long timestamp) Get the Unix Epoch milliseconds of a given timestmap.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

GREGORIAN_MILLISECONDS

public static final long GREGORIAN_MILLISECONDS

MILLISECONDS_PER_SECOND

public static final long MILLISECONDS_PER_SECOND

See Also:

Constant Field Values

TIMESTAMP_RESOLUTION

public static final long TIMESTAMP_RESOLUTION

See Also:

Constant Field Values

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 with milliseconds precision. 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 with milliseconds precision.

Parameters:

timestamp - a timestamp

Returns:

the instant