makeatimerTimers
Online timer
Start a free online timer in seconds, or count down to a clock time in any time zone.
Time math
Start / finish time calculator
Find a finish time from a duration, or work backwards to a starting time.
Inputs
Result
Same day
How to use start / finish time calculator
Plan when to start a task or when it will finish. The day offset makes it clear when a calculation crosses midnight, including tasks longer than one day.
Worked example
A 1:30:00 task starting at 09:00 finishes at 10:30. To finish at 09:00, start at 07:30.
What the result means
The result uses fixed clock arithmetic. It does not apply a time zone or daylight-saving changes.
Use Copy result to copy the displayed answer. Share link preserves the inputs so someone else can open and edit the calculation. This link does not start timing or request permissions.