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The 1900 and 1904 Date Systems

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

Key points
  • Enter the value
  • Change the system
  • Compare

In Excel Serial Date you can switch between the 1900 and 1904 systems.

Steps

  1. Enter the value
  2. Change the system
  3. Compare
The same number differs by about four years between the systems.
Use "Excel Serial Number and Date Converter" (free)

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