Date 1904 - How to convert to Date 1900?

[Alex St-Pierre]

Hi!
Does anyone know how to convert an excel file where
the date are in function of 1-1-1904 to an excel where the
date are based on 1-1-1900? I know I can do it manually,
by unchecked the case "use date 1-1-1904" but all the date
change when I uncheck it... (I would like like to
uncheck "using date from 1-1-1904" without having the
effect of the date movement (- 4 years).

Thanks,

Alex

 

[Dave Peterson]

From a previous post:

Just some more info:

One workbook was using a base year of 1900 and the other was using 1904.
(tools|options|calculation tab|1904 date system)

One way to add those four years back is to find an empty cell, put 1462 into
that cell.

Copy that cell.

Select your range that contains the dates. Edit|PasteSpecial|click Add (in the
operation box).

You may have to reformat the cell as a date (mine turned to a 5 digit number).
But it should work.

You may want to do it against a copy...just in case.

(I'm not sure which one you'll fix. You may want to edit|pastespecial|click
subtract.)

Most windows users use 1900 as the base date. Mac users (mostly??) use 1904 as
the base date.