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Counting Days: With or Without the First Day

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

Key points
  • Enter the dates
  • Toggle the checkbox
  • Compare the days

The difference

From April 1 to April 10 is 9 days without the first day, and 10 days with it.

How to switch

Use "Count the first day too" in Calculate Age, Days Between Dates and Date Offsets. For contract or application periods, check the rules.

Use "Calculate Age, Days Between Dates and Date Offsets" (free)

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