Help & feedback
Know which clock you are counting.
Time and time zones
Network reference time is estimated from this site's edge response and is shown with round-trip latency. Select an IANA time zone for calculation. For cross-zone intervals, choose a separate end time zone.
Date difference
Calendar days compare civil date labels. Elapsed hours compare real instants in the selected time zones, including daylight-saving changes.
Calendar addition
Days, months, and years use calendar arithmetic in the selected time zone. Hours and minutes are elapsed time. Thirty days and one month are deliberately different operations.
Business deadlines
Add mode excludes the starting date. Count mode excludes the start and includes the end. The selected holiday calendar controls weekends, public holidays, and adjusted workdays.
Share, print, and export
A share link includes the chosen inputs, holiday calendar, and time zones. Calendar export downloads an all-day ICS event. Printing uses the visible result.
Something looks wrong?
Send the exact inputs, expected result, language, time zones, and device to [email protected]