Calendar Please enter a positive whole number.

[Alpha1]

In continuation of:
https://nixfifty.com/threads/1-day-event-becomes-multi-year-event.8479/

While the event was added in 2013, in reality the first celebration of the event started in 1943.
So I tried to edit the event to display the start in 1943.

This results in the following errors:

Please correct the following errors:

• Please enter a positive whole number.
• Please enter a positive whole number.

 

[Naz]

It's not possible to add an event before 1970 since date/time is sorted in Unix time.

Unix time - Wikipedia

 

[Alpha1]

Ah, that makes sense. Thanks!