Time calculator
Add/subtract hours/minutes/seconds and convert decimal hours..
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Change the input or settings to update your result. Results update as you type. Up to 1,000,000 characters.
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How to use Time calculator
- Enter your text in the input field.
- The result updates as you type. Adjust the available settings if needed.
- Review the result, then use Copy result or a download link when available.
Working with time calculator
Date calculations can depend on calendar rules, time zones and whether endpoints are included. A duration in hours is different from a number of calendar days when daylight-saving changes occur.
Common questions
Are all days exactly 24 hours long?
Elapsed time across a daylight-saving transition can differ from a simple calendar-day count. Use the measure relevant to your schedule.
Why can the same timestamp show different dates?
A timestamp represents an instant, while a calendar date is interpreted in a time zone. Near midnight, the same instant can fall on different local dates.