Having had to deal with nice simple problems like "What if a person is in timezone A, working with times from timezone B", I am very glad that I don't have to deal with anything more complex.
For a brief understanding why dates and times are so complex, watch this. It's theoretically about computers, but actually it's mostly about the fact that questions like "How much time passed between this date and that date" are not actually simple at all.
For a brief understanding why dates and times are so complex, watch this. It's theoretically about computers, but actually it's mostly about the fact that questions like "How much time passed between this date and that date" are not actually simple at all.