Time Duration Between Times Calculator NZ
This calculator works out the time between a start and an end time in New Zealand, giving the result in hours and minutes and as decimal hours, and handling spans that run overnight. It answers a question that comes up constantly, from filling in a timesheet to working out how long a shift, a journey, a meeting or an event lasted, and doing it in your head is easy to get wrong, especially when the clock crosses midnight or noon. The method is simple once both times are turned into minutes from midnight: subtract the start from the end, and if the end is earlier than the start the period must run overnight, so a day is added. You enter the start time and the end time, and the calculator returns the duration in hours and minutes, and a decimal-hours figure, which is the form payroll and billing usually want. Use it for shift hours, to bill time, to check how long something took, or to total a block of the day. For pay, subtract any unpaid breaks from the result and then multiply the paid hours by your rate. Overnight shifts work correctly, so 10 pm to 6 am shows 8 hours, not a negative. A quick, reliable way to measure the time between two clock times.
If the end time is before the start, the span is treated as overnight. Subtract unpaid breaks separately for paid hours. A timekeeping tool.
How it works
Both times are converted to minutes from midnight. The duration is the end minutes minus the start minutes; if that is negative, 1,440 minutes (a day) is added to handle an overnight span. The result is shown as hours and minutes, decimal hours, and total minutes.
Worked example
From 9:00 am to 5:30 pm is 510 minutes, which is 8 hours and 30 minutes, or 8.5 decimal hours. From 10:00 pm to 6:00 am, the overnight handling gives 8 hours.
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