Doing something at a time convenient for the user is a recurring (sic!) challenge with web applications. And the more users you have across a multitude of time zones, the more pressing it becomes to do it well. It is actually not that hard, but it does have a few fiddly bits which can be challenging to put together. So, let’s do some time traveling.

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Time zone handling in web applications requires understanding that time zones change over time, making conversions dependent on when they're performed. The key is storing IANA timezone identifiers, using proper libraries like Fugit for scheduling recurring events, and keeping timezone data updated across the entire stack. For user-specific scheduling like daily workday notifications, combine browser-detected timezones with recurring pattern libraries to calculate accurate UTC timestamps.

Scheduling things in user's time zone