Move a date forward or backward by years, months, weeks and days. Help
Subtract time
Subtract time
Add time
Add time
Countdown
See the time remaining until a fixed target date and time in years, months, weeks, days, hours, minutes and seconds. Help
Timezone conversion
Convert a date and time between timezones with daylight-saving rules. Help
Daylight-saving rules are applied for the selected date. Repeated times default to the earlier occurrence; you can choose the later one. Rules come from your browser’s timezone data; its update date is not available. Verify critical meeting or travel times.
Verify critical dates with the responsible authority before relying on them.
Know what goes into your answer.
Calendar days
Every day counts, including Saturdays, Sundays and public holidays. Adding 1 day moves to the following date; adding 0 days keeps your start date.
Month ends and leap years
Years and months are applied together, then weeks and days. When a day does not exist in the destination month, it moves to that month’s last valid day.
Country and holidays
No holidays are excluded and no holiday dataset is used. Changing country changes location defaults, not the calendar-day result.
Yes. Select US (MM/DD/YYYY), EU (DD/MM/YYYY) or ISO (YYYY-MM-DD), then type the date or use the calendar picker.
Does a daylight saving change affect the answer?
Date-only arithmetic uses UTC calendar dates. Countdown uses the selected timezone for years, months, weeks and days; hours, minutes and seconds show the remaining elapsed time. A calendar day can last 23 or 25 hours during daylight-saving changes.
Are my dates saved?
Calculations stay in your browser. Theme and saved targets remain on this device. New loads select location from country/region or IP; dates enter a URL only when shared.
