Crow Tech

Free utility

Excel Serial Date Converter

Convert bounded spreadsheet serial dates in the 1900 or 1904 system.

All free utilities

Processing stays on this device. Your input is not uploaded, sent to an external service, or saved by Crow Tech.

Workbench

Inputs stay on this page. Use the explicit action to validate and produce a result.

Implements the 1900 and 1904 serial systems. Serial 60 in the 1900 system is explicitly returned as the fictitious compatibility date 1900-02-29 rather than a real instant.