Time Duration Calculator
Calculates hours and minutes between two times, including overnight shifts.
Result
- Duration
- 9 h 30 min
- In hours
- 9.50 hours
How to use the time duration calculator
- Enter the start time.
- Enter the end time.
- The results update as you type, or press Calculate.
- Read the duration first, then the supporting figures below it.
Formula
Duration = end − start (+24 h if end is earlier).
Worked example
For example, with these inputs:
- Start time: 09:00
- End time: 18:30
the calculator returns:
- Duration: 9 h 30 min
- In hours: 9.50 hours
Background
Time durations are easier to handle in minutes. Convert each time to minutes after midnight, subtract, then convert back to hours and minutes, adding 24 hours for shifts that run past midnight.
Many Singapore rules are expressed in days: notice periods, leave entitlements, stamp duty deadlines and probation periods. Whether the count includes the start or end date, and whether weekends count, changes the answer.
Frequently asked questions
How does the time duration calculator work?
It applies this formula: Duration = end − start (+24 h if end is earlier).
Does this count Singapore public holidays?
No. It counts calendar days or weekdays. Subtract any public holidays in the period yourself.