Bug report: Date change by saving

[derdaniel23]

Bug description

If you add a date in a recurrence rule and save this the date will be automatically changed to one day earlyer

Steps to reproduce

Go to co.radiocorax.de, open schedule/4051/ or any other, press Add date, add Date 2020-10-13, press "sichern und weiter editieren"

Actual result

You added the date Mondy, Oktober 12, 2020

Expected result

Save the same date as added

Workaround

Calculate a day later to save the actually wanted date

[stefan-walluhn]

Issue is caused by mix of timezone aware and timezone unaware date processing. Dates are casted to UTC, but are stored timezone unaware in the recurrence ruleset.

We have to fix timezone awarenes one more time, or have to switch back to timezone unaware processing at all.

[stefan-walluhn]

jazzband/django-recurrence#70