Countdowns, durations, and age in days.
Whether you're counting down to an event, figuring out how many business days are left, or working out someone's exact age, these calculators handle calendar math correctly - including leap years and weekday-only counts - so you don't have to count by hand.
Find out how many days remain until any future date.
Calculate the number of days, weeks, months, and years between two dates.
Count the number of weekdays between two dates.
Calculate the duration between two times of day, including overnight spans.
Add or subtract hours and minutes to or from a starting time.
A free multi-timer that runs in your browser - run several named countdowns at once, each with its own start,…
A free alarm clock that runs in your browser - set a time and it alerts you when your clock reaches it.
A free stopwatch that runs in your browser - start, lap, and reset with tenth-of-a-second precision.
See the exact current time and date, updating live in your browser.
Generate one or more random dates within a chosen date range.
Convert 12-hour clock time to 24-hour military (army) time, and back.
Convert a Unix timestamp (epoch time) to a human-readable date, or a date to a timestamp.
Find the ISO week number for any date.
Convert a time from one time zone to another, including current time in any zone.
Find when the clocks change for daylight saving time in any time zone.
Find sunrise and sunset times for any date and major city.
Find the sun's altitude and azimuth (solar noon, direction, and height in the sky) for any date, time, and…
Find what day of the week any date falls on, past or future.
Check whether a year is a leap year and find the next one.
Calculate exact age in years, months, and days.
Estimate someone's birth year (or year range) from their current age.
See a meeting time across multiple time zones at once.