Time
Duration Calculator
Add and subtract durations.
Calculated in your browser. Free, nothing is uploaded.
About this tool
Free duration calculator tool. Add and subtract durations. No signup, nothing uploaded.
Frequently asked questions
Which timezone is used?
Both UTC and your local timezone are shown where relevant.
Does it handle daylight saving?
Yes, through the browser's own timezone database.
Is anything sent to a server?
No. All calculations are local.
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