How It Works
Excel stores dates as serial numbers where January 1, 1900 = 1, January 2, 1900 = 2, etc. This system allows Excel to perform date arithmetic efficiently.
Excel intentionally includes a phantom February 29, 1900 (serial number 60) for compatibility with an old Lotus 1-2-3 bug. This converter handles this correctly.
Serial number 45000 corresponds to July 3, 2023. This is useful for debugging date formulas, VBA macros, or data imports where dates appear as numbers.