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I have a legacy spreadsheet (meaning I can't really modify it, and have no one to ask). I have it open in OpenOffice but I checked it in Excel and the same thing happens.

There are two date columns that have the user-defined format code [$-409]DD-MMM-YYYY;@ (see screenshot).

The cells in these columns will not accept any date format I've tried. It says 'invalid value'.

I did some research here on Stack overflow: excel-number-format-what-is-409 so now I know the $=409 is a locale code.

So now my question is: when entering data manually, how can I arrange my date input to satisfy that condition?

Screengrab from .XLSX file opened in OpenOffice

DaveC426913
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