The calendar is currently very neat.
However it would be somewhat improved if one could simply be capable to manually enter a year/month/(full date?) to effortlessly revisit a distant period in time.
For example: When I currently wish to head back to the old millienium I need to click a minimum of 20+ times to reach that period.
Another thing that bugs me is the fact that if after I went all the way back in time and my mouse the focus goes away from the calendar then it closes and I lost my navigation so I need to reembark on a 20+ clicking mission to get back to then. Sucks that all Dolorians were already taken...
In another set of mind: (And after having done a quick search on this topic already) how much complicated would it be to include the moon phases in the present calendar? I am thinking either to natively scrape data off something similar to https://www.timeanddate.com/moon/phases/ or be able to import that functionality via a plugin.
Doubtful that the plugin import suggestion is the solution as there is not even a plugin import functionality (also not sure how much it would really be useful over time)