About the Time Since Calculator
How long ago something happened, in years, months, days and hours.
Also known as: how long ago, elapsed time calculator, time passed since, anniversary counter.
How to use this calculator
- Enter date in the past, today.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
elapsed = today − the past date
Worked example
Using the values pre-filled in the calculator above:
- Date in the past: 2025-09-22
- Today: 2026-09-22
the calculator returns:
- Time since: 1 years, 0 months, 0 days
- Total days: 365
- Total weeks: 52.14
- Total months: 12