Time and Calendar Tools

Add Days to a Date, Week Numbers, Leap Years, Birthdays and Live Countdowns

Time and calendar tools for the questions a wall calendar answers slowly: what date it will be in 90 days, which weekday a date falls on, which ISO week it is, whether a year is a leap year, and how long is left until a birthday, a retirement date or Christmas.

Calendars 5

Date arithmetic, weekdays, ISO week numbers, leap years and birthdays.

Add Days To A Date

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

Day Of The Week Calculator

What day of the week any date falls on, past or future.

Days Left In The Year

Days left in the year, day of the year and percentage gone.

Leap Year Checker

Is it a leap year, which rule decides it, and the next one.

Week Number Calculator

The ISO week number for today or any date.

Countdowns 10

Live countdowns to holidays, special days and any date you pick.

Birthday Countdown

Days until your next birthday, the age you turn, and the weekday.

Countdown Timer

A live countdown to any date and time you choose.

Days Until Christmas

How many days and sleeps until Christmas, counting live.

Days Until Easter

How many days until Easter Sunday, and when Easter falls.

Days Until Father's Day

How many days until Father's Day, in June or September.

Days Until Halloween

How many days until Halloween, with a live countdown.

Days Until Mother's Day

How many days until Mother's Day, in the UK or the US.

Days Until New Year's Day

How many days until New Year's Day, with a live countdown.

Days Until Valentine's Day

How many days until Valentine's Day, with a live countdown.

Retirement Date Calculator

Your retirement date and the years, months and days left.

Durations 4

Add times, count hours between times and convert decimal hours.

Decimal Hours Converter

Convert 7:45 to 7.75 hours and back again.

Hours Calculator

Hours between two times, minus breaks, with overnight shifts.

Time Calculator

Add and subtract hours, minutes and seconds in one line.

Hours To Minutes Converter

Convert between seconds, minutes, hours, days and weeks.

Work and Contracts 5

Notice periods, contract and lease end dates, working hours and timesheets.

Contract End Date Calculator

Find the end date and notice deadline of a fixed-term contract.

Notice Period Calculator

Find the last day of a notice period in days, weeks or months.

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Rental Lease Calculator

Lease end date, total rent and every payment due date.

Timesheet Calculator

Total a week of shifts with overtime and gross pay.

Working Hours Calculator

Working hours per day, week, month and year from your usual shift.

Date Formats 1

Write dates in words for letters, cheques and invitations.

Date To Words Converter

Write any date out in words for invitations, cheques and documents.

Time Zones and Travel 5

Flight arrival times across zones and jet lag recovery plans.

Flight Arrival Time Calculator

Local arrival time for any flight across time zones.

Jet Lag Calculator

How long jet lag lasts and how your body clock shifts each day.

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Meeting Planner

Find a meeting time that works across several time zones.

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Time Difference Calculator

How many hours ahead or behind one city is from another.

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World Clock

Live times for your cities on a day and night world map.

Sun and Daylight 2

Sunrise, sunset, twilight and golden hour for any place and date.

Golden Hour Calculator

Golden hour and blue hour times for photographers.

Sunrise Sunset Calculator

Sunrise, sunset, day length and twilight for any place and date.

How the time and calendar tools count

Every tool reads a date exactly as you typed it, as a plain calendar day, so a time zone offset can never push an answer onto the wrong day. Leap years follow the Gregorian rule, weeks follow ISO 8601, and moving holidays such as Easter and Mother's Day are worked out for each year rather than looked up from a list.

Live countdowns

The countdown pages tick every second from your device's clock. Leave the date field blank to count from today, or enter a date to see how far away the event was or will be from any other day.