Add or Subtract Days from a Date

How it works

Enter a starting date, choose whether to add or subtract, and enter the number of days, weeks, or months. The calculator instantly computes the resulting date and displays it along with the day of the week. It handles month-end edge cases (like adding 1 month to January 31st) and leap years correctly. Quick presets for common intervals like 30, 60, 90, and 180 days are available for fast calculations. To set a countdown to your calculated date, try Countdawns for Android.