Dates & time calculators

Enter a Gregorian date to see where it falls in an NRF-style retail calendar. The result includes the fiscal year, period, week, comparable prior-year date, sales-release date, and a full period calendar.

Enter the year printed on a calendar to find other Gregorian years with the same date-to-weekday layout. You can search forward, backward, or compare one target year directly.

Enter an accrual start date and end date to compare common day count conventions. You can also solve for the earliest end date that reaches a target year fraction.

Enter a known first day of your rotation and the calendar year you need. The calendar maps every date to a shift state and reports work totals, weekends, hours, and the longest uninterrupted break.

Convert a Gregorian calendar date to its ISO week date, or enter an ISO week-year, week number, and weekday to resolve the calendar date. The result also compares ISO numbering with the Sunday-start and Monday-start POSIX week systems.

Choose a numbered day or a weekday pattern to make a complete monthly schedule. The results show exactly which months are skipped or moved to month-end and include an RFC 5545-style rule.

Build a pay-period calendar from a known anchor date or a monthly schedule. The result shows each period, payday adjustments, cutoff dates, high-paycheck months, and year-boundary periods.

Enter a year to calculate Western Easter and Orthodox Pascha on the Gregorian civil calendar. The tool also compares the dates, lists related movable feasts, and finds the next year when both traditions share Easter Sunday.