Using the Time Duration Calculator
Select Next day when the finish belongs to the following calendar day, even if the finish time looks later than the start time. The selection adds twenty-four hours before the break is subtracted. A negative net duration is rejected so an inconsistent entry is not mistaken for elapsed time.
Worked example
Use the example inputs below to reproduce this result. These are the form's starting values, not recommended targets. Changing your inputs updates your result above; this worked example stays fixed for comparison. Results are rounded for display.
Example inputs
- Start time
- 09:00
- End time
- 17:30
- End day
- Same day
- Unpaid break (minutes)
- 30
Example result
- Total minutes
- 480
- Decimal hours
- 8
- Hours and minutes
- 8h 0m
Method and assumptions
Subtract start time and unpaid breaks from end time. A next-day end adds 24 hours. Does not model timezone or daylight-saving changes.
Choose a time-recording convention
Before combining time entries, decide whether you are recording elapsed time, paid time or another duration. Keep break handling and decimal-hour conversion consistent across records. A clock interval alone does not determine payroll treatment. If a policy rounds time or applies overtime, apply that policy separately rather than assuming it is built into the duration.
Common question
Does entering an earlier finish automatically mean overnight?
No. Choose Next day explicitly. This prevents an accidental early finish entry from silently becoming a long overnight interval. Once that choice is made, the calculator adds a day and subtracts the specified break.
Guide updated .