Time & Dates calculators
How many days are left until a deadline? How old is someone in years, months, and days? How long did a shift run once the unpaid break is taken out? The questions are simple, but uneven month lengths, leap years, and shifts that cross midnight make the counting easy to get wrong.
These calculators do the calendar and clock arithmetic for you and state the conventions they follow, including whether the end date is counted and how a February 29 birthday is treated in a common year.
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- Age CalculatorFind an exact age in years, months and days on any date, plus total days, weeks and the next birthday.
- Countdown CalculatorSee how many days, hours and minutes are left until (or since) a date and time, in weeks and months too, plus business days if you like.
- Date CalculatorAdd or subtract days, weeks, months and years from any date to get the resulting date, its weekday and the weekdays in between.
- Days Between Dates CalculatorCount the days between two dates, with weeks, months, years-months-days, hours, and a split into weekdays and weekend days.
- Hours CalculatorFind the hours and minutes between two clock times, even overnight, minus an unpaid break. See decimal hours and, if you like, the pay.
- Military Time ConverterChange AM/PM time into military (24-hour) time and back. See how to say each time out loud, plus a full military time chart.
- Time CalculatorAdd or subtract hours, minutes and seconds from a time of day or a length of time. It shows the day too, if the answer passes midnight.
- Time Card CalculatorAdd up a week of start and end times with unpaid breaks, split regular and overtime hours (weekly or daily), and work out gross pay.
- Time Zone ConverterSee what time it is in another time zone for any date and time, with daylight saving time worked out for that exact day.
- Zodiac Sign CalculatorFind the Western sun sign and the Chinese zodiac animal and element for any birth date from 1901 to 2100, using the real Lunar New Year date.
- Business Days CalculatorCount the Monday-to-Friday working days between two dates, or add working days to a date, allowing for holidays.
- Day of the Year CalculatorFind which day of the year a date is, how many days are left, and its week number. Or turn a day number back into a date.
- Hours to Decimal ConverterTurn hours and minutes into decimal hours for timesheets and payroll, or turn decimal hours back into hours and minutes.
- Age Difference CalculatorFind the age gap between two people in years, months and days, who is older, and the date one was or will be twice the other's age.
- Day of the Week CalculatorFind out which day of the week any date falls on, from the year 1 to 9999, with the hand method (Zeller's) shown step by step.
- Leap Year CalculatorCheck whether a year is a leap year with each step of the Gregorian rule, find the previous and next leap years, and list them in a range.
- Speed, Distance and Time CalculatorFind how long a trip will take and when you'll arrive, from the distance and your speed. Or find the distance covered or the average speed of a trip.
- Week Number CalculatorFind the ISO 8601 or US week number of any date, or the first and last day of any numbered week in a year.