Time Since Calculator
Calculate how much time has passed since a date and time, with live years, months, days, hours, minutes and seconds.
The calculation uses your browser's local time. If the event happened in another time zone, enter the local event time after converting it.
How long has it been since a date?
Time-since searches usually need a live elapsed-time answer from a past date to the current browser time or to a chosen reference date.
t_start is the entered date and time, and t_reference is now or the selected comparison time.
Elapsed time breakdown
- Calendar breakdown in years, months and days.
- Clock breakdown in hours, minutes and seconds.
- Total days, weeks, months and years as supporting equivalents.
- Live mode updates while the page is open.
Frequently Asked Questions
Sources and References
- DateMDN Web Docs
- Representing dates and timesMDN Web Docs
- International System of Units: TimeNIST
- ISO 8601 date and time formatISO
- Time Duration Calculatortimeanddate.com
Calculations are based on the listed reference sources. Links open in a new tab.
Related Tools
Find the calendar date a number of days ago or days from a chosen date, with weekday and exact date output.
Calculate the number of days between two dates, with exclusive or inclusive counting, weeks, calendar years/months/days and weekday/weekend totals.
Calculate duration between a start and end time or between two date-times, with optional break deduction, overnight shifts, decimal hours and night-minute reference.
Calculate live exact age from date and optional time of birth, with years, months, days, hours, minutes, seconds and total time lived.