This is a pretty long post from Jon Skeet on storing and converting UTC. For those interested in more of a tldr, the conclusion at the end of the post is “intended to be read in a standalone fashion.”
When I read Stack Overflow questions involving time zones, there’s almost always someone giving the advice to only ever store UTC. Convert to UTC as soon as you can, and convert back to a target time zone as late as you can, for display purposes, and you’ll never have a time zone issue again, they say.
This blog post is intended to provide a counterpoint to that advice. I’m certainly not saying storing UTC is always the wrong thing to do, but it’s not always the right thing to do either.