I did try 0001 -- dates before 0099 get converted to 1899.

Maybe we should switch to the Mayan calendar. They could track dates back 
to the 5th century BC.

On Sunday, August 4, 2019 at 2:32:32 PM UTC-7, TonyM wrote:
>
> I belive it has being very common to calculate dates based on 1900 01 01 
> of which the result above is the day before. Years come with leap days and 
> some centuries turn over without a leap day. As a result to be accurate 
> over a long period is quite involved.
>
> Try any date except 0, perhaps 00010000 and see what happens. Zero is 
> famous for divide by zero errors and perhaps year zero never existed. 
>
> Calendars are supprisingly complex.
>
> Regards
> Tony
>
>

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