Date & Time Tools

Free date and time tools — calculate ages and date differences, convert time zones and timestamps, count down to events, find week numbers and business days, and generate calendars.

Calculate between dates

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Age Calculator

Calculate your exact age in years, months and days from your birth date.

Date Difference

Find the exact time between two dates in days, weeks, months and years.

Date Add / Subtract

Add or subtract days, weeks, months or years from a date.

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Business Days Calculator

Count the working days between two dates, optionally excluding weekends.

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Life Statistics

See your age in many units plus estimated heartbeats, breaths and a birthday countdown.

Look up calendar facts

Week Number

Find the ISO week number, day of year and quarter for any date.

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Day of the Week

Find which weekday a date falls on, plus day of year, week number and weekend status.

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Leap Year Checker

Check whether a year is a leap year and see the next few leap years.

Days in Month

Find how many days are in any month, plus the weekdays it starts and ends on.

3rd

Nth Weekday Finder

Find dates like the 3rd Monday or the last Friday of a given month.

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Calendar Generator

Display a localized month calendar for any month and year, with today highlighted.

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Zodiac Sign Finder

Find the western zodiac sign and Chinese zodiac animal for any birth date.

Convert time zones and formats

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Time Zone Converter

Convert a date and time from one time zone to another.

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World Clock

See the current local time across major cities and time zones at a glance.

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Timezone Meeting Planner

Find meeting times that fall in working hours across multiple time zones, with a DST-aware overlap grid — all offline.

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Date Format Converter

Format a date and time as ISO 8601, RFC 2822, US, EU, Unix and localized strings.

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Military Time Converter

Convert between 12-hour, 24-hour and military time — type any time and see all three.

Milliseconds Converter

Convert milliseconds to a days, hours, minutes, seconds breakdown and back.

Timers, stopwatch and alarms

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Countdown Timer

Live countdown showing the days, hours, minutes and seconds until a target.

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Pomodoro Timer

A focus timer that cycles between work and break periods and counts your sessions.

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Stopwatch

A precise stopwatch with lap times, accurate to hundredths of a second.

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Online Alarm Clock

Set wall-clock alarms that ring right in your browser tab, with snooze and a live clock.

Add up hours and durations

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Time Duration Calculator

Add or subtract two HH:MM:SS durations and see the normalized result.

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Work Hours Calculator

Calculate hours worked from clock-in and clock-out, minus breaks, with optional pay.

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Sleep Calculator

Find ideal bedtimes or wake-up times based on 90-minute sleep cycles.

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