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How to Add or Subtract Days from a Date

Published: Oct 19, 2026 | Updated: Oct 19, 2026 | About (Japanese)

Key points
  • Enter the starting date
  • Enter the days
  • Read the result

Steps

  1. Enter the "Starting date" in Calculate Age, Days Between Dates and Date Offsets.
  2. Enter the days in "Days to add". For subtraction, use a negative number.
  3. "Resulting date" is shown with the weekday.
Use "Calculate Age, Days Between Dates and Date Offsets" (free)

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