Clock service contains some functionality related to time and scheduling.
To get the current time in a specific time unit, the
currentTime function takes a unit as
TimeUnit and returns
val inMilliseconds: UIO[Long] = Clock.currentTime(TimeUnit.MILLISECONDS)
val inDays : UIO[Long] = Clock.currentTime(TimeUnit.DAYS)
To get current date time in the current timezone the
currentDateTime function returns a ZIO effect containing
Also, the Clock service has a very useful functionality for sleeping and creating a delay between jobs. The
sleep takes a
Duration and sleeps for the specified duration. It is analogous to
java.lang.Thread.sleep function, but it doesn't block any underlying thread. It's completely non-blocking.
In the following example we are going to print the current time periodically by placing a one second
sleep between each print call:
def printTimeForever: ZIO[Any, Throwable, Nothing] =
ZIO.sleep(1.seconds) *> printTimeForever
For scheduling purposes like retry and repeats, ZIO has a great data type called Schedule.