What about time can you depend on?
You can't. Time is a completely relative concept. If you expect order, use a sequence.
Exactly.
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Earlier quoted context omitted.
Actually, almost no country outside the British Empire (and not even Scotland inside it) implemented the Gregorian reform at the same time. Britain was pretty late in doing so, too. As for "all modern computer systems", Unix time is completely ignorant about anything except seconds.
> Unix time is completely ignorant about anything except seconds. In hindsight, it seems like a brilliant decision.