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Add Days to Date

Calculate a future date by adding days

Add / Subtract Days from Date

Start Date
Number of Days

Date addition/subtraction calculates the resulting date after adding or removing days, automatically handling month boundaries, varying month lengths, and leap years.

  1. 1Add days to get future date; subtract to get past date
  2. 2Leap years add February 29 every 4 years (with century exceptions)
  3. 3Business day calculators exclude weekends and public holidays
  4. 4ISO 8601 format (YYYY-MM-DD) avoids ambiguity
15 February + 14 days=1 March (or 29 February in a leap year)
MonthDays
Jan, Mar, May, Jul, Aug, Oct, Dec31 days
Apr, Jun, Sep, Nov30 days
February28 days (29 in leap years)
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