Start by identifying the finish day
For an ordinary daytime shift, a later clock time is a later point in the same day. Overnight work needs one extra fact: the finish belongs to the following day. A start at 22:00 and a finish at 06:00 should be read as an eight-hour shift only after that next-day assumption has been confirmed.
The work hours calculator makes this explicit with a next-day option. This is useful because an earlier finish could also be a typing error. Do not use an overnight assumption to conceal an unexplained record. Check the source schedule or attendance entry first.
Split the shift at midnight
A simple manual check is to calculate the time from the start to midnight, then add the time after midnight. From 22:15 to midnight is 1 hour 45 minutes. From midnight to 06:45 is 6 hours 45 minutes. The full span is 8 hours 30 minutes.
For a finish later on the following day, the next-day setting still adds a full calendar boundary. A shift from 08:00 to 09:00 the next day is 25 hours. Review an unusually long result against the actual record. Use the date-and-time duration calculator when a period spans more calendar boundaries or needs explicit dates.
Deduct only the time you mean to exclude
List the unpaid breaks for the shift and add their minutes. A 30-minute meal break plus a 15-minute unpaid break gives a 45-minute deduction. From the 8-hour 30-minute span above, deducting 45 minutes leaves 7 hours 45 minutes, or 7.75 decimal hours.
Paid breaks should not be deducted merely because they are called breaks. Which periods count toward payable time depends on the agreement and rules that apply to the work. Keep the calculator’s subtraction separate from that decision. A note explaining the break treatment makes the final record easier to check.
Review the week and exceptional dates
Enter each shift separately in the time card calculator, with its own break and next-day setting. Review the row totals before relying on the weekly sum. Missing times, double deductions and a wrong finish day can all affect an otherwise plausible total.
These worksheets use local clock arithmetic. If an overnight shift crosses a daylight-saving change, the clock labels may not represent the actual elapsed hours. Use an attendance record with the relevant offset or location for that exception. A clear record preserves the original times, the break deduction and any separately explained adjustment.