Date and time

Time difference, add or subtract intervals, countdown, stopwatch, Unix timestamp conversion, and related tools.

Add to a date
Add years, months, days, hours, minutes, and seconds to a base date and time.
Countdown timer
Count down to a target date and time in your local timezone.
Date/time difference
Find the difference between two dates and times.
Date and time to Unix timestamp
Convert a local date and time to a Unix timestamp in seconds.
Stopwatch
A stopwatch with start, pause, reset, and lap times. Runs in your browser.
Subtract from a date
Subtract years, months, days, hours, minutes, and seconds from a base date and time.
Unix timestamp to date and time
Convert a Unix timestamp in seconds to readable local and UTC date and time.