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Find the right calculator for every task

Time & Date Calculators

Tools for ages, date math, countdowns, week numbers, weekdays, timezones, and business days

Age Calculator

Calculate exact age in years, months, and days.

Date Calculator

Add, subtract, and compare dates.

Date Duration Calculator

Find how many days, weeks, and months separate two calendar dates.

Days Ago Calculator

Find the calendar date a number of days before today.

Days From Today Calculator

Find the calendar date N days from today.

Days Until Calculator

Count days until a future date—or since a past date.

Deadline Calculator

Project a deadline by adding business or calendar days from a start date.

Lead Time Calculator

Add calendar or business-day lead time to an order date for delivery estimates.

Military Time Converter

Convert between 12-hour AM/PM and 24-hour military time.

Time Calculator

Add or subtract hours and minutes from a clock time.

Time Card Calculator

Calculate hours worked from clock-in, clock-out, and break time.

Time Until Calculator

See how much time remains until a target date and time.

Today's Date

See today's date, weekday, ISO week, day of year, and days left in the year.

Add Time Calculator

Add two clock times together for total hours and minutes.

Birth Year Calculator

Estimate birth year from current age and an optional as-of date.

Business Days Calculator

Count working days between dates.

Countdown Calculator

Find the time remaining until a date.

Day of Week Calculator

Find the weekday for any date.

Days Left in the Year Calculator

Count remaining days in the year from today or any date.

Elapsed Time Calculator

Find elapsed hours and minutes between two times on the same day.

Hours Calculator

Calculate hours between two times or convert days plus hours to total hours.

Hours From Now Calculator

See the date and time a number of hours from right now.

Julian Date Calculator

Convert Gregorian dates to Julian day numbers and back.

Month Calculator

Add months to a date or find how many days are in any month.

Playback Speed Calculator

Find watch time or real duration when changing video playback speed.

Reading Time Calculator

Estimate reading time from word count and words per minute.

Time Ago Calculator

See how long ago a past date and time was.

Time Duration Calculator

Calculate elapsed time between two times.

Time Span Calculator

Measure the day span between two calendar dates.

Timezone Converter

Convert times between world time zones.

Week Calculator

Look up ISO week details or add weeks to any date.

Week Number Calculator

Find the week number for any date.

Weeks Ago Calculator

Find the date a number of weeks before today.

Weeks From Today Calculator

Find the date a number of weeks from today.

Working Days Calculator

Count Monday–Friday working days between two dates.

Years Ago Calculator

Find the calendar date a number of years before today.

Years From Today Calculator

Find the date a number of years from today.