Thought Palace

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Link reblogged from Infinite Undo

Falsehoods programmers believe about time

http://infiniteundo.com/post/25326999628/falsehoods-programmers-believe-about-time

infiniteundo:

I have repeatedly been confounded to discover just how many mistakes in both test and application code stem from misunderstandings or misconceptions about time. By this I mean both the interesting way in which computers handle time, and the fundamental gotchas inherent in how we humans have constructed our calendar — daylight savings being just the tip of the iceberg.
In fact I have seen so many of these misconceptions crop up in other people’s (and my own) programs that I thought it would be worthwhile to collect a list of the more common problems here…

A great list that shows how tricky timekeeping is, especially when two computers have to communicate timestamps to each other (I had an awful bug once in a P2P app I was writing that only manifested when two peers were in different time zones…)
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  So you think there are 24 hours in a day? Time is much more complicated than we often realise. You’d better read this.
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  Oldie but goodie:
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  Once, I reprogrammed my microwave clock to 24 hour time. :/
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  Date & Time Gothas.
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  I admit to some of them…
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