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I'm pretty sure that it's 23 because some time passed between keystrokes, so the delta was 23:59:50, and he only keeps the most significant digit. I had to do this exact thing yesterday for timetaco.com.

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Shouldn't it be immutable? I'd expect this to be a default behaviour.

Not in this case. The entire proposition of slang_time is that it returns human readable time difference with respect to now (i.e., the moment when called).

In this case, consistency would imply the immutability of time.

Shouldn't it round up?

If it's 01:00:01, is it two hours?

If it's 00:59:50, is it 0 hours?

i have the feeling his natural answer to both questions is no...

Fine, rounding up fails.

Round to nearest time unit, instead.

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