Add/Subtract Days Calculator
The add/subtract days calculator lets you add or subtract days, weeks, months, or years from any date. Instantly see the resulting date and its day of the week.
Perfect for calculating deadlines, due dates, expiration dates, or planning events. Enter a start date, choose an operation, and specify the amount to get your result.
How it works
The calculator uses calendar arithmetic to add or subtract the specified number of days, weeks, months, or years from the input date. Weeks are converted to days (×7). Month and year additions follow calendar rules, adjusting for varying month lengths.
Use cases
- Calculating project deadlines
- Finding expiration or due dates
- Planning events a specific number of weeks or months ahead
- Determining dates for recurring schedules