duration
how much time sits between two moments?
- total seconds
- 356,400
- total minutes
- 5,940
- total hours
- 99.00
- total days
- 4.125
- weeks
- 0.59
── about this calculator ──
The duration calculator finds the exact span of time between two moments. It is the right tool for project deadlines, contract terms, anniversaries, billable-hour totals across a date range, and any "how long was that?" question. The math is simple subtraction in milliseconds, but two things make it tricky in real life: daylight-saving transitions and the difference between calendar days and business days. We handle both. DST is handled automatically by your browser's timezone database; business days are calculated by counting the number of Mondays through Fridays inclusive between the two dates.
The "total days" row in the breakdown is shown as a decimal so you can use it directly in spreadsheets — for example, 3.5 means three days and twelve hours. The "weeks" row uses the same convention.
── frequently asked ──
- › How do I calculate the duration between two dates?
- Pick a start date and time, then an end date and time. The calculator updates instantly with the total in days, hours, minutes, and seconds, plus weeks and totals in each unit.
- › What counts as a business day?
- We count Monday through Friday as business days and exclude Saturday and Sunday. Public holidays vary by country and are not subtracted automatically — if you need that, subtract them manually using the add/subtract calculator.
- › Does it handle daylight-saving time?
- Yes. Calculations use your browser's local timezone and the IANA timezone database, so a span that crosses a DST boundary will correctly be one hour shorter or longer.
- › Can the duration be negative?
- Yes. If your end date is before your start date, the result is shown with a leading minus sign and the absolute breakdown below it.
- › Is my data sent to a server?
- No. Every calculation runs locally in your browser. The dates you enter never leave your device.