Time Calculator
Add or subtract hours and minutes from any time of day. Great for scheduling, shift planning, and travel time calculations.
Result (24-hour)
—
Result (12-hour) —
Day Offset —
How to Use This Calculator
- Enter the start hour (0–23) and start minute (0–59).
- Choose Add or Subtract.
- Enter the hours and minutes to offset.
- The result shows the new time in 24-hour and 12-hour formats, plus any day overflow.
Formula
Total minutes = Start minutes ± Offset minutes
Result hour = floor(Total / 60) mod 24 | Result minute = Total mod 60
Example
Example: 22:45 + 3 hours 30 minutes = 02:15 (+1 day).
Frequently Asked Questions
- Enter the start hour and minute, set the operation to Add, then enter the hours and minutes to add. The result time wraps past midnight automatically.
- Yes — if you add 5 hours to 10:00 PM (22:00), the result is 3:00 AM the next day, and the day offset is shown.
- Enter times in 24-hour format (0–23 for hours). The result is shown in both 24-hour and 12-hour (AM/PM) formats.
- There is no hard limit. Adding 100 hours to any time will show the correct result with the number of days elapsed.
- Enter the start time, set to Add, and enter the duration in hours and minutes. The result is your end time.