Check deadlines, schedules, durations, birthdays, reporting windows, and calendar offsets in a fast repeatable layout.
DATE CALCULATOR
Add or subtract days, weeks, months, and years...
Shifted calendar date
Add or subtract date units from a base date
August 22, 2026
WeekdaySaturday
ISO weekW34
Day of year234
Practical guide
How to use the Date Calculator
Add or subtract days, weeks, months, and years from a date to plan schedules, renewals, and deadlines.
Pick a base date and shift it forward or backward by common date units. Use clean values and review the result label: shifted calendar date.
Calendar calculations can be affected by timezone, inclusive counting, leap years, holidays, and local business-day rules.
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Tools for the same workflow
Open a nearby calculator or utility when the next step needs a different format, comparison, or check.