3 calculators in this category
- Day of the Week CalculatorZeller's congruence (1882); ISO 8601 weekday numberingEnter any date and this calculator returns the weekday, the ISO 8601 weekday number, the day of the year and the Julian Day…
- ISO Week Number CalculatorISO 8601-1:2019 week numberingThis calculator converts a date to its week number and back again. In ISO 8601 mode it returns the week number, the week-based…
- Age in Days, Hours & Minutes CalculatorFliegel–Van Flandern Julian Day NumberEnter a date of birth and this calculator returns the exact elapsed time to any reference date: total days, weeks, hours…
Which one do you need?
- Day of the Week Calculator
- Find the weekday for any date, Gregorian or Julian, using Zeller's congruence. See every intermediate term so you can work the same date out in your head.
- ISO Week Number Calculator
- Convert any date to its ISO 8601 week number and week-based year, or turn a week number back into its Monday-to-Sunday date range.
- Age in Days, Hours & Minutes Calculator
- Work out exactly how many days, weeks, hours, minutes and seconds you have lived, and find the calendar date you turn 10,000 days old.