đ Excel Date Serial â Human Date Converter
Convert between Excel serial numbers and human-readable dates with real-time conversion
đ Excel Date System
Range: 1 to 2,958,465 (1900 system) or 0 to 2,957,003 (1904 system)
â
Select any date from 1900 to 9999
đ Conversion Results
Serial Number:
45881
Human Date:
Monday, August 11, 2025
Day of Week:
Monday
Days from Epoch:
45880
Excel Formula:
=DATE(2025,8,11)
ISO Format:
2025-08-11
âšī¸ About Excel Date Systems
- 1900 System: Used by Windows Excel. January 1, 1900 = 1
- 1904 System: Used by Mac Excel. January 1, 1904 = 0
- Leap Year Bug: 1900 system incorrectly treats 1900 as a leap year
- Time Support: Decimal values represent time (0.5 = 12:00 PM)
đ§ Common Use Cases
- Converting imported data with serial dates
- Debugging Excel date formulas
- Cross-platform Excel file compatibility
- Understanding Excel's internal date storage
đ Quick Examples
Serial 1: January 1, 1900
Serial 44927: January 1, 2023
Serial 45292: January 1, 2024
Serial 25569: January 1, 1970 (Unix Epoch)