excel date to unix timestamp
'VBA functions to convert between Excel and Unix date-times. 'These work on Windows and optionally the Mac: Function UnixDateTime#(ExcelDateTime As Date, Optional Mac As Boolean) Dim OSOffset: OSOffset = IIf(Mac, 24107, 25569) UnixDateTime = (ExcelDateTime - OSOffset) * 86400 End Function Function ExcelDateTime(UnixDateTime#, Optional Mac As Boolean) As Date Dim OSOffset: OSOffset = IIf(Mac, 24107, 25569) ExcelDateTime = (UnixDateTime / 86400) + OSOffset End Function