Clock

Jumps the clock forward. Runs timers that become due, but fires each callback at most once. Accepts milliseconds or a duration string such as '01:00:00'.

Installs the fake clock. Replaces time-related functions in this browser context with controlled implementations. The optional time becomes the initial value used by the fake clock.

Advances time and pauses it. Runs timers that become due, but fires each callback at most once. The time can be a timestamp, a duration string, or a DateTimeInterface.

Resumes clock progression. Time starts flowing from its current value after a previous pause. Timers then run according to their normal schedule.

Runs the clock for a duration. Executes time-related callbacks that become due during the elapsed period. Accepts milliseconds or a duration string such as '01:00:00'.

Fixes the reported date. Makes Date.now() and new Date() return the supplied fake time. Timers continue running while date reads remain fixed.

Sets the system time. Changes the fake clock's current time without running due timers. Use it when time must move without executing scheduled callbacks.