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That require you to know the offset. That's no different than knowing what hour their morning starts.

Kids usually go to school around 8am and that families eat dinner around 7pm. Those times are similar in many places. I try to remember events throughout the day, not just when they arrive at work because I tend to make judgement calls about scheduling people's time based on what I know about their entire daily schedule.

All you have to remember is the offset and everything else fits.

You have to know the offset though. And if it is with multiple people you might even have multiple offsets. There's nothing easier about offsets over differing work times

All you care about is the offset, regardless of whether time zones exist or not. Knowing the east coast is 3 hours ahead of us, I know calling at 8PM is probably a bad idea. You don’t need that intermediate step of figuring out what number is associated with that on the east coast.

You don’t care that Bob is in EST, you just need to know that he’s 3 hours ahead of you.

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