Time Since a Date
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About this calculator
Enter a past date to see how much time has elapsed. The calculator shows the duration in your chosen unit — seconds, minutes, hours, days, weeks, or years. Optionally add a specific time for sub-day precision.
How it works
The calculator compares the date and time you enter against the current moment. It computes the difference in seconds, then converts to your selected unit using standard conversion factors (60 seconds per minute, 3,600 per hour, 86,400 per day, etc.). The result updates each time you change the date, time, or unit.
When to use this calculator
Track how long it has been since you quit smoking, started a new job, moved to a new city, or began a savings plan. Sobriety trackers, streak counters, and milestone anniversaries all benefit from knowing exact elapsed time. Businesses use it to track time since a product launch, last incident, or last customer complaint.