About the time calculator
Use this calculator to add two lengths of time together or to subtract one from another. Enter each duration as days, hours, minutes and seconds. Values larger than a normal clock allows, such as 90 minutes, are fine and are carried over automatically.
The result is shown in a normalized form (days, hours, minutes, seconds) and as a total in hours, minutes and seconds. If you subtract a longer duration from a shorter one, the answer is negative.
Formula
- Total seconds = ((days × 24 + hours) × 60 + minutes) × 60 + seconds
- Result = first ± second, then split back into days, hours, minutes and seconds
Example
1 day 14 h 30 m 15 s plus 10 h 45 m 50 s equals 2 days 1 h 16 m 5 s, which is 49.2681 hours.