Some with JavaScript timezone specific date times. My solution is to generally favour https://www.npmjs.com/package/@date-fns/utc so that my code works the same without any effort in any timezone.
The trouble is when you have to deal with timezone-aware business logic. `date-fns-tz` does exist, but the amount of brain contortions required to keep track of everything is frankly exhausting, not to mention error-prone.
