Time Calculator
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Time Calculator
Every number is calculated in your browser. Nothing is sent to a server.
How it works
About this calculator
Stack up durations in days, hours, minutes and seconds. Switch any row between plus and minus, then optionally apply the normalised total to a date and time.
Normalised totals
Seconds roll into minutes, minutes into hours and hours into days, so 90 minutes is always shown as 1 h 30 min.
Negative results
Subtracting more than you add produces a negative duration. Applying it moves the date backwards.
Local time
Applying a duration uses your device’s local calendar and clock, including the current daylight-saving offset.
Questions & answers
Frequently asked
Can I mix days, hours and minutes?
Yes. Every row accepts all four units. Leave the fields empty if you do not need them.
What does the resulting moment do?
It adds the signed total to the date and time you choose, which is handy for deadlines, SLA targets or travel planning.
Results are provided for convenience. For legal, payroll or medical decisions, confirm with a qualified professional.