Add or subtract time, calculate durations between times. Useful for scheduling and payroll. Runs in your browser.
Add or subtract time durations. Input fields can be left blank (treated as 0).
Add or subtract days, hours, minutes, or seconds from a specific date and time.
💡 Pro Tip: Use the "Current Time/Date" buttons for quick calculations starting from now.
Learn how to convert between time units including seconds, minutes, hours, days, and more.
Complete guide to calculating hours, minutes, and time differences.
Master date and time calculations with our comprehensive guide.
A time calculator lets you add or subtract time (hours, minutes, seconds, days) from a start time or date. Ours works as a time difference calculator too: you get the resulting time or date after adding or subtracting a duration. Use it for scheduling, duration, and time arithmetic.
Enter your start time (or use current time), choose Add or Subtract, then enter the duration in days, hours, minutes, and seconds. Click Calculate to see the result. You can also add or subtract time from a specific date and time in the Date Calculator section of this page.
For the difference between two clock times (e.g. 9 AM to 5 PM), use our Hours Calculator. This Time Calculator adds or subtracts a duration from one time or date—so you get a new time/date, not the span between two times.
Yes! Click 'Use Current Time' to set the start time to now, then add or subtract a duration to see what time it will be or was.
Yes. It's 100% free, no registration, no tracking. All calculations run in your browser.
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