Calculator category
Date Arithmetic & Calendars Calculators
Compare, add, subtract, classify, enumerate, and generate Gregorian dates with explicit endpoint, month-end, recurrence, workweek, and closure rules. Start by choosing the endpoint, month-end, workweek, closure, or recurrence convention that governs the task. Compare total-day and calendar-component results separately and inspect every generated date before reusing a schedule.
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Date Arithmetic & Calendars topics
Select a topic to reveal its calculators. Multiple topics can remain open at the same time.Date Arithmetic & CalendarsCompare, add, subtract, classify, enumerate, and generate Gregorian dates with explicit endpoint, month-end, recurrence, workweek, and closure rules.10 available
- Date Difference & DurationCompare two valid Gregorian dates as signed total days and an exact calendar decomposition, with endpoint inclusion and direction made explicit.Open calculator
- Date Add/Subtract & Missing DateAdd or subtract calendar years, months, weeks, and days, or solve a missing start date using a declared end-of-month convention.Open calculator
- Business Days CounterCount working days, weekends, entered holidays, and custom closures across a date range using an explicit workweek and endpoint convention.Open calculator
- Business Date & DeadlineMove forward or backward by a chosen number of working days while showing skipped weekends, entered closures, and the exact dates counted.Open calculator
- Weekday FinderIdentify a date's weekday, its occurrence number within the month, and the previous and next matching weekdays.Open calculator
- ISO Week Number & Week DateConvert a Gregorian calendar date to ISO week-year, week number, and weekday, or convert a valid ISO week date back to a calendar date.Open calculator
- Day of Year & Days RemainingFind the ordinal day, days remaining, week position, and percentage of the calendar year elapsed for a selected date.Open calculator
- Leap Year & Leap-Day RangeCheck a Gregorian year and enumerate every leap year and February 29 occurrence across an inclusive year range.Open calculator
- Calendar GeneratorGenerate a complete month or year calendar with configurable week start, ISO week numbers, and explicitly entered highlighted dates.Open calculator
- Recurring Date SequenceGenerate bounded daily, weekly, monthly, yearly, selected-weekday, nth-weekday, or last-weekday date sequences with explicit invalid-date behavior.Open calculator