Time Calculator
Calculate durations between two times or add/subtract time from a start time. Perfect for scheduling, time tracking, and event planning.
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator has two main functions: Time Difference and Add/Subtract Time. All times use the 24-hour format (HH:MM).
1. Calculate Time Difference
- Enter a Start Time and an End Time (both in HH:MM format).
- Click Calculate Difference.
- The result shows the duration in hours and minutes (e.g., 9h 0m).
- If the end time is earlier than the start time, it assumes the time crosses midnight.
2. Add or Subtract Time
- Enter a Start Time (HH:MM format).
- Specify the Hours, Minutes, and Seconds to add or subtract. Minutes and seconds must be less than 60.
- Click Add or Subtract.
- The result shows the new time in HH:MM:SS format (e.g., 10:30:00).
- Results wrap around midnight if needed (e.g., 23:00 + 2 hours = 01:00).
Note: All inputs are required. Invalid or missing entries will show an error message.
Previous Results
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Frequently Asked Questions
Enter the start and end times in the Time Difference section and click 'Calculate Difference'. The result shows the duration in hours and minutes.
Yes, enter a start time, then specify hours, minutes, and seconds to add or subtract. Click 'Add' or 'Subtract' to see the resulting time.
The calculator assumes the end time is on the next day if it is earlier, correctly calculating the duration across midnight.