Historic events in nextcloud calendar?

Hallo,
I tried to see historic events I inserted in my Android Handy and tried to sync with “whole calendar” caldavsync, (i.e. 1957) in my nextcloud calendar.
The Calendar shows up nothing for this year on the Web-Interface (so I think its a nextcloud issue) and syncs nothing to thunderbird.
Is there a calendar limit for historic data? Can I change a parameter to make this possible? Or is it a bug?
Thanks for help!

The minimum date is 01.01.1970.

We set this limit for technical reasons, it can’t be changed.

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Ok, thanks for the quick reply.