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Date & Time

Date & Time

Ages, date differences, countdowns, timers and time zones, for working out how long you have actually got.

15 tools in 5 groups

Calculators

6 tools

Age Calculator

Find your exact age in years, months, and days, with a live counter, your next birthday, and the age difference between two people.

Date Difference Calculator

Find the exact time between two dates in years, months, and days, plus a business-days count and a shareable result link.

Business Days Calculator

Count the working days between two dates, or add and subtract business days - skipping weekends and any holidays you enter.

Date Calculator

Add or subtract years, months, weeks, and days from any date to find the resulting date and its weekday.

Hours Calculator

Work out the hours between a start and end time (minus breaks), or paste a whole time card and have the week read for you - with pay, overtime, and both h:mm and decimal hours.

Military Time Converter

Convert 12-hour AM/PM time to 24-hour military time and back, with midnight and noon handled correctly, plus a full conversion chart.

Timers

3 tools

Online Stopwatch

A free online stopwatch with lap timing, full keyboard control, and a session that survives a page reload.

Countdown Timer

A free online countdown timer with a real alarm sound, plus a shareable link so anyone can watch the same countdown to your event live.

Pomodoro Timer

A configurable Pomodoro timer that chimes and sends a browser notification when each phase ends, so it reaches you while you work in another tab.

Timestamps

1 tool

Unix Timestamp Converter

Convert a Unix timestamp to every common date format at once, ISO 8601, RFC 2822, UTC, local, and relative time, or turn any date back into epoch seconds and milliseconds.

Time Zones

1 tool

Time Zone Converter

Convert one moment across many time zones at once, meeting-planner style, with working-hours coloring and a shareable link. Runs in your browser.

Calendar

4 tools

Week Number Calculator

Find the ISO 8601 week number for any date, plus the US Sunday-start week, the weekday, and the full date range of that week.

Leap Year Calculator

Check if any year is a leap year, or list every leap year between two years with a total count and the number of February 29s. Shows the exact rule that decided each one.

Zodiac Sign Calculator

Enter your birthday to get a full profile: your western sun sign, Chinese zodiac animal, birthstone, birth flower, and an optional two-sign compatibility read. All private, in your browser.

Day of the Week Calculator

Enter any date to find the day of the week it falls on, plus the day of the year, ISO weekday number, and the same date across other years.