As a Real Programmer(tm) I have developed such a deep fear of anything time and date related that I would fully endorse dispatching an API call to the tz_database instead of attempting any fucking part of this.

Kids, it's fine to meme about silly stuff... but date and time is deadly serious, regardless of how careful you think you're being you are wrong.

Do you know how many timezones there are in Indiana? No? Look it up and scream in horror.