What problems can possibly be caused by the 1904 date system? It can
display negative times if the OP chooses, and it doesn't include any
imaginary dates the way the 1900 system does...

Certainly blindly mixing date systems can result in problems when
copying from a workbook using one system to a workbook using the other,
but that's not a problem caused by either system...

In article ,
"T. Valko" wrote:

The 1904 date system can cause other problems so I would
recommend not using it.