Date & Time
Time Calculator
Add or subtract two HH:MM time spans, see the formatted result, and view total minutes for scheduling clarity.
Add or subtract HH:MM durations with negative-aware formatting.
Time span math
Each time is converted into minutes (hours × 60 + minutes). The calculator adds or subtracts the totals and then formats the answer back into HH:MM, preserving a leading minus sign for negative results.
How to use
- Pick whether you want to add or subtract the second time span.
- Enter Time A and Time B using HH:MM formatting.
- Read the combined result and total minutes in the results block.
Example
Input: Operation = Add, Time A = 02:30, Time B = 01:45
Output: Result = 04:15 (255 total minutes)
FAQ & notes
Can I work with negative time spans?
Yes. Subtracting a larger span from a smaller one produces a negative result that is clearly labeled with a minus sign.
Does the calculator handle hours over 24?
Absolutely. Inputs are treated as durations, so 30:00 represents 30 hours without wrapping to the next day.