TimeUnit | API reference | Android Developers

class TimeUnit

Known Direct Subclasses

TimeUnit.DAYS	Time unit representing twenty four hours.
TimeUnit.HOURS	Time unit representing sixty minutes.
TimeUnit.MICROSECONDS	Time unit representing one thousandth of a millisecond.
TimeUnit.MILLISECONDS	Time unit representing one thousandth of a second.
TimeUnit.MINUTES	Time unit representing sixty seconds.
TimeUnit.NANOSECONDS	Time unit representing one thousandth of a microsecond.
TimeUnit.SECONDS	Time unit representing one second.

A represents time durations at a given unit of granularity and provides utility methods to convert across units, and to perform timing and delay operations in these units. A does not maintain time information, but only helps organize and use time representations that may be maintained separately across various contexts. A nanosecond is defined as one thousandth of a microsecond, a microsecond as one thousandth of a millisecond, a millisecond as one thousandth of a second, a minute as sixty seconds, an hour as sixty minutes, and a day as twenty four hours.

A TimeUnit is mainly used to inform time-based methods how a given timing parameter should be interpreted. For example, the following code will timeout in 50 milliseconds if the lock is not available:

<code>Lock lock = ...;
  if (lock.tryLock(50L, TimeUnit.MILLISECONDS)) ...</code>

while this code will timeout in 50 seconds:

<code>Lock lock = ...;
  if (lock.tryLock(50L, TimeUnit.SECONDS)) ...</code>

Note however, that there is no guarantee that a particular timeout implementation will be able to notice the passage of time at the same granularity as the given TimeUnit.

Summary

Enum values
`DAYS` Time unit representing twenty four hours.
`HOURS` Time unit representing sixty minutes.
`MICROSECONDS` Time unit representing one thousandth of a millisecond.
`MILLISECONDS` Time unit representing one thousandth of a second.
`MINUTES` Time unit representing sixty seconds.
`NANOSECONDS` Time unit representing one thousandth of a microsecond.
`SECONDS` Time unit representing one second.

Public methods
Long	`convert(duration: Duration!)` Converts the given time duration to this unit.
Long	`convert(sourceDuration: Long, sourceUnit: TimeUnit!)` Converts the given time duration in the given unit to this unit.
static TimeUnit!	`of(chronoUnit: ChronoUnit!)` Converts a `ChronoUnit` to the equivalent `TimeUnit`.
Unit	`sleep(timeout: Long)` Performs a `Thread.sleep` using this time unit.
Unit	`timedJoin(thread: Thread!, timeout: Long)` Performs a timed `Thread.join` using this time unit.
Unit	`timedWait(obj: Any!, timeout: Long)` Performs a timed `Object.wait` using this time unit.
ChronoUnit!	`toChronoUnit()` Converts this `TimeUnit` to the equivalent `ChronoUnit`.
Long	`toDays(duration: Long)` Equivalent to `DAYS.convert(duration, this)`.
Long	`toHours(duration: Long)` Equivalent to `HOURS.convert(duration, this)`.
Long	`toMicros(duration: Long)` Equivalent to `MICROSECONDS.convert(duration, this)`.
Long	`toMillis(duration: Long)` Equivalent to `MILLISECONDS.convert(duration, this)`.
Long	`toMinutes(duration: Long)` Equivalent to `MINUTES.convert(duration, this)`.
Long	`toNanos(duration: Long)` Equivalent to `NANOSECONDS.convert(duration, this)`.
Long	`toSeconds(duration: Long)` Equivalent to `SECONDS.convert(duration, this)`.

Enum values

DAYS

enum val DAYS : TimeUnit

Time unit representing twenty four hours.

HOURS

enum val HOURS : TimeUnit

Time unit representing sixty minutes.

MICROSECONDS

enum val MICROSECONDS : TimeUnit

Time unit representing one thousandth of a millisecond.

MILLISECONDS

enum val MILLISECONDS : TimeUnit

Time unit representing one thousandth of a second.

MINUTES

enum val MINUTES : TimeUnit

Time unit representing sixty seconds.

NANOSECONDS

enum val NANOSECONDS : TimeUnit

Time unit representing one thousandth of a microsecond.

SECONDS

enum val SECONDS : TimeUnit

Time unit representing one second.

Public methods

convert

fun convert(duration: Duration!): Long

Converts the given time duration to this unit.

For any TimeUnit unit, unit.convert(Duration.ofNanos(n)) is equivalent to unit.convert(n, NANOSECONDS), and unit.convert(Duration.of(n, unit.toChronoUnit())) is equivalent to n (in the absence of overflow).

Parameters
`duration`	Duration!: the time duration

Return
`Long`	the converted duration in this unit, or `Long.MIN_VALUE` if conversion would negatively overflow, or `Long.MAX_VALUE` if it would positively overflow.

Exceptions
`java.lang.NullPointerException`	if `duration` is null

convert

fun convert(
    sourceDuration: Long, 
    sourceUnit: TimeUnit!
): Long

Converts the given time duration in the given unit to this unit. Conversions from finer to coarser granularities truncate, so lose precision. For example, converting 999 milliseconds to seconds results in 0. Conversions from coarser to finer granularities with arguments that would numerically overflow saturate to Long.MIN_VALUE if negative or Long.MAX_VALUE if positive.

For example, to convert 10 minutes to milliseconds, use: TimeUnit.MILLISECONDS.convert(10L, TimeUnit.MINUTES)

Parameters
`sourceDuration`	Long: the time duration in the given `sourceUnit`
`sourceUnit`	TimeUnit!: the unit of the `sourceDuration` argument

Return
`Long`	the converted duration in this unit, or `Long.MIN_VALUE` if conversion would negatively overflow, or `Long.MAX_VALUE` if it would positively overflow.

of

static fun of(chronoUnit: ChronoUnit!): TimeUnit!

Converts a ChronoUnit to the equivalent TimeUnit.

Parameters
`chronoUnit`	ChronoUnit!: the ChronoUnit to convert

Return
`TimeUnit!`	the converted equivalent TimeUnit

Exceptions
`java.lang.IllegalArgumentException`	if `chronoUnit` has no equivalent TimeUnit
`java.lang.NullPointerException`	if `chronoUnit` is null

sleep

fun sleep(timeout: Long): Unit

Performs a Thread.sleep using this time unit. This is a convenience method that converts time arguments into the form required by the Thread.sleep method.

Parameters
`timeout`	Long: the minimum time to sleep. If less than or equal to zero, do not sleep at all.

Exceptions
`java.lang.InterruptedException`	if interrupted while sleeping

timedJoin

fun timedJoin(
    thread: Thread!, 
    timeout: Long
): Unit

Performs a timed Thread.join using this time unit. This is a convenience method that converts time arguments into the form required by the Thread.join method.

Parameters
`thread`	Thread!: the thread to wait for
`timeout`	Long: the maximum time to wait. If less than or equal to zero, do not wait at all.

Exceptions
`java.lang.InterruptedException`	if interrupted while waiting

timedWait

fun timedWait(
    obj: Any!, 
    timeout: Long
): Unit

Performs a timed Object.wait using this time unit. This is a convenience method that converts timeout arguments into the form required by the Object.wait method.

For example, you could implement a blocking poll method (see BlockingQueue.poll) using:

<code>public E poll(long timeout, TimeUnit unit)
      throws InterruptedException {
    synchronized (lock) {
      while (isEmpty()) {
        unit.timedWait(lock, timeout);
        ...
      }
    }
  }</code>

Parameters
`obj`	Any!: the object to wait on
`timeout`	Long: the maximum time to wait. If less than or equal to zero, do not wait at all.

Exceptions
`java.lang.InterruptedException`	if interrupted while waiting

toChronoUnit

fun toChronoUnit(): ChronoUnit!

Converts this TimeUnit to the equivalent ChronoUnit.

Return
`ChronoUnit!`	the converted equivalent ChronoUnit

toDays

fun toDays(duration: Long): Long

Equivalent to DAYS.convert(duration, this).

Parameters
`duration`	Long: the duration

Return
`Long`	the converted duration

toHours

fun toHours(duration: Long): Long

Equivalent to HOURS.convert(duration, this).

Parameters
`duration`	Long: the duration

Return
`Long`	the converted duration, or `Long.MIN_VALUE` if conversion would negatively overflow, or `Long.MAX_VALUE` if it would positively overflow.

toMicros

fun toMicros(duration: Long): Long

Equivalent to MICROSECONDS.convert(duration, this).

Parameters
`duration`	Long: the duration

Return
`Long`	the converted duration, or `Long.MIN_VALUE` if conversion would negatively overflow, or `Long.MAX_VALUE` if it would positively overflow.

toMillis

fun toMillis(duration: Long): Long

Equivalent to MILLISECONDS.convert(duration, this).

Parameters
`duration`	Long: the duration

Return
`Long`	the converted duration, or `Long.MIN_VALUE` if conversion would negatively overflow, or `Long.MAX_VALUE` if it would positively overflow.

toMinutes

fun toMinutes(duration: Long): Long

Equivalent to MINUTES.convert(duration, this).

Parameters
`duration`	Long: the duration

Return
`Long`	the converted duration, or `Long.MIN_VALUE` if conversion would negatively overflow, or `Long.MAX_VALUE` if it would positively overflow.

toNanos

fun toNanos(duration: Long): Long

Equivalent to NANOSECONDS.convert(duration, this).

Parameters
`duration`	Long: the duration

Return
`Long`	the converted duration, or `Long.MIN_VALUE` if conversion would negatively overflow, or `Long.MAX_VALUE` if it would positively overflow.

toSeconds

fun toSeconds(duration: Long): Long

Equivalent to SECONDS.convert(duration, this).

Parameters
`duration`	Long: the duration

Return
`Long`	the converted duration, or `Long.MIN_VALUE` if conversion would negatively overflow, or `Long.MAX_VALUE` if it would positively overflow.

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