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Comment by DannoHung | Hacker News Reader

As long as we're posting wikpedia links: http://en.wikipedia.org/wiki/Leap_second

I wouldn't trust any time unit larger than seconds if I was concerned about my units staying consistent. Hopefully time-keeping bodies don't decide we need leap-millis at some point.

Which is only to say that this is a problem that can't be solved simply by discarding some concepts that you find problematic. There's a lot of shit about timekeeping that's problematic. I'd advise tossing all the problematic shit when trying to figure out some internal representation for the underlying time that more or less always makes sense and then building out more human-usable representations with the uglyness on top of it.

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> Which is only to say that this is a problem that can't be solved simply by discarding some concepts that you find problematic.

> I'd advise tossing all the problematic shit when trying to figure out some internal representation for the underlying time that more or less always makes sense and then building out more human-usable representations with the uglyness on top of it.

I don't mean to be snarky, but these two sentences seem contradictory—you say that the problem can't be solved by discarding problematic concepts, then advise to discard problematic concepts. Are you making the point that, even if internally we work with an un-problematic representation of time (if such a thing exists!), at some point we have to convert to and fro? Certainly I agree with that. Though I seem to have said it badly, that's really what I meant to say above: trying to work directly with months (and, perhaps less dramatically, with days), which are not units of time, allows the problematic real-world notion of time to contaminate what should be the clean internal representation of it.

I guess? I'm saying that you can't realistically avoid working with the problematic units. Like, if you want to have a monthly payment system, at some point, you have to bake in the human concept of months into your system, warts and all.

When my cell plan was with T-mobile, I was on a pre-paid plan. My bill was due once a month, so I set up monthly automatic billing. Well, the system that enabled or disabled my service depending on if I had paid considered that to be "every 30 days". The system that handled the automatic payments considered that to be the same day every month (IIRC, it charged my card on the 18th of every month; when I set it up my bill was due on the 20th). A couple of 31-day months later, and I lose service for a day because the automatic payments didn't keep up with the bill being due.

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