Date and Time Calculators
Tools for dates and times. Find the number of days or working days between two dates, add days to a date, work out an exact age, add up hours for a timesheet, check a week number or convert a meeting time between time zones.
Results allow for leap years and month lengths, so you can trust the count.
Dates and days See all
Age CalculatorFind an exact age in years, months and days, and the next birthday.Days Until CalculatorCount the days, weeks and months until any date.Add Days to Date CalculatorAdd or subtract days, weeks, months or years from a date.Date CalculatorAdd or subtract years, months, weeks and days from any date, with the month end rules shown.Day of the Week CalculatorFind the day of the week for any date in the past or future, and see how that date falls in later years.Birthday CalculatorSee the day you were born, your next birthday and half birthday, how many days you have lived and the dates of your milestones.Julian Date ConverterConvert a date and time to a Julian date, Julian day number, modified Julian date and day of year format, and back.UK School Year CalculatorFind a child's school year group in England from their date of birth, using the 1 September cut-off.Weekday CounterCount how many Mondays, Tuesdays and every other weekday fall between two dates.Date Format ConverterShow a date in UK, US, international standard and written formats, and check whether a numeric date such as 03/04/2026 is ambiguous.Date Difference CalculatorCount the years, months and days between two dates, plus total days, weeks and working days.Working Days CalculatorAdd or subtract working days from a date, skipping weekends and England and Wales bank holidays.
Time and hours See all
Hours CalculatorWork out hours worked for each day of the week and the total.Time Card CalculatorWork out hours and weekly pay from clock in and clock out times.Time CalculatorAdd and subtract hours, minutes and seconds, and see the total as hh:mm:ss and in decimal hours.Military Time ConverterConvert 24 hour military time to 12 hour clock time and back, with the way it is said aloud.Hours to Decimal CalculatorConvert hours and minutes to decimal hours for timesheets and invoices, or decimal hours back to hours and minutes.Sunrise and Sunset CalculatorWork out sunrise, sunset, solar noon and day length for any place and date from its latitude and longitude.Meeting PlannerFind the hours when working days overlap across up to four time zones, with daylight saving taken into account.Time Zone ConverterConvert a date and time from one city to up to four others, with UTC offsets and day changes.
Timers See all
Pomodoro TimerWork in focused sessions with short and long breaks in between.Multiple TimersRun several named countdown timers at once, such as for cooking, with a sound when each one finishes.Alarm ClockSet one or more alarms for a time of day, with a snooze button and a repeat each day. The page must stay open.Countdown Timer and StopwatchCount down to a date and time with a live display, or time something with a simple stopwatch.
Calendars and dates See all
Week Number CalculatorFind the week number for any date, or the dates of a given week.Leap Year CheckerCheck if a year is a leap year and see the next ones.Zodiac Sign FinderFind your western star sign and Chinese zodiac animal.Easter Date CalculatorFind the date of Easter Sunday for any year from 1583, with Good Friday, Easter Monday and the other dates that follow it.Moon Phase CalculatorSee the phase of the moon on any date, how much is lit, its age, and the dates of the next new and full moons.UK Bank HolidaysBank holidays in England and Wales, Scotland and Northern Ireland for 2026 and 2027, from GOV.UK.Printable Calendar GeneratorMake a printable monthly or yearly calendar that starts on Monday or Sunday, with week numbers and UK bank holidays if you wish.Chinese Zodiac CalculatorFind your Chinese zodiac animal and element from your date of birth, using the real date of Chinese New Year.Nth Weekday of the Month CalculatorFind the first, second, third, fourth or last Monday (or any day) of a month, such as the last Friday in June.When Do the Clocks Change?Dates and times of the clock changes in the UK, Europe, the US and Canada for any year, with the length of the changeover days.
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Guides to read first
How to calculate the days between two dates
Count the days, weeks and months between two dates by hand, avoid the inclusive versus exclusive trap, and handle leap years, deadlines and week numbers.
Leap years explained: the rules, the dates and the edge cases
Why we have leap years, the three-part rule that decides them, the next leap years to 2048, and what 29 February means for birthdays, pay and contracts.
How many working days are in 2027 in the UK?
There are 253 working days in 2027 in England and Wales, 252 in Scotland and 251 in Northern Ireland. See every bank holiday and a monthly count.