DATE CALCULATOR

Add or subtract days, weeks, months, and years...

Shifted calendar date

Add or subtract date units from a base date

Base date

Days

Weeks

Months

Years

May 21, 2026

WeekdayThursday

ISO weekW21

Day of year141

Specific Tool Notes: Use this calculator when you need a target date after adding or subtracting days, weeks, months, or years from a known starting point.