Topic

Dates and Business Days

Calendar math is full of traps: months with different lengths, leap years, weekends and holidays. These calculators do the counting for you and show which days were included.

Date calculations use plain calendar dates, so they are not affected by time zones or daylight saving time.

9 calculators in this topic

Business Days CalculatorCount business days between two dates, or find the date a number of business days away.Days Between Dates CalculatorCount the days between two dates, with the answer in weeks, months and years too.Date CalculatorAdd or subtract days, weeks, months or years from any date.Age CalculatorFind an exact age in years, months and days, the next birthday, or the age gap between two people.Time Zone ConverterTurn a time in one zone into the same moment in up to six other zones, with the UTC offset and daylight saving status for that exact date.Unix Timestamp ConverterPaste a timestamp to see the date in UTC and in a zone you choose, or enter a date and time to get the timestamp.Day of the Week CalculatorPick a date to see which day of the week it falls on and where it sits in the year.Week Number CalculatorLook up the week number of a date, or the first and last day of a week number, using ISO or US numbering.Julian Date CalculatorGet the astronomical Julian Date for a moment in UTC, convert one back to a calendar date, or find the ordinal day of the year.

Guides for this topic

How to Calculate Business Days (With US Holidays)How to count working days between dates or add business days to a date, including how US federal holidays that fall on weekends are observed.How to Calculate the Time Between Two DatesCount days, weeks, months and years between dates by hand, handle leap years and month ends and decide whether to include the end date.