Overview
Find how long it has been since an event, project start or birthday. The tool shows the full duration in days and hours plus an easy-to-read calendar breakdown.
Formula
Subtract the past moment from the reference to get minutes, then split into days, hours and minutes. The calendar breakdown counts years, months and days.
How it works
Enter the past moment
The date and time to measure from.
Set the reference
Leave empty for now or choose another moment.
Read the duration
It appears in days, hours and minutes.
Worked examples
Project age
If a project started 90 days ago, the duration appears in weeks and days.
Since an important event
Enter the event's date and time to see how long ago it was.
Frequently asked questions
Is today included?
Elapsed time is exact to the minute, while the calendar breakdown uses whole days.
Why can the gap differ by an hour?
Crossing a daylight-saving change can add or remove an hour in local time.
Can the reference be in the future?
No, the reference must come after the past moment.
This calculator is for educational and informational purposes only and is not a substitute for professional advice.