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Date and time math,
without a calendar.

Days between two dates, the date 100 days from now, what time it is in New York or Tokyo, and how many hours you worked. Every result is in the URL, so you can bookmark or share it.

Dates

Date calculator

Count the days between two dates, or find the date a number of days, weeks, months or years before or after a date.

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Time

World clock & time zone converter

The current time in 33 cities, and what a given time in one city is everywhere else. Daylight saving time is handled automatically.

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Hours calculator

Hours worked from start and end times and a break, or add up times like 1:30 + 2:45.

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Try an example

What is the date 100 days from today? days.html?mode=add&n=100&unit=d&di… How many days until the end of the year? days.html?mode=diff 9 am in New York is what time in London and Tokyo? sekaidokei.html?city=newyork&time=09:00 Hours worked from 9:00 to 17:30 with a 30-minute break jikan.html?mode=work&start=09:00&end=1…