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Thanks for bringing this onto my radar. I've already settled with arrow, but when I can go without it, I combine datetime with pytz, which is so much faster at applying/changing timezones than arrow. I still need to check out 3.9's built-in timezones.

I have only used Pendulum and skimmed Arrow's API just now.

Pendulum does more. It has tools for manipulating a date. Add days, compare to other dates, etc.

Arrow appears primarily focused on parsing and formatting.

No, Arrow is much more than parsing/formatting.

Each Arrow object has a `shift` method, which is how you can add or subtract units of time. Greater/less/equal comparisons work exactly as you'd expect them to.

Pendulum is better