On Jan 24, 2012, at 4:51 PM, Mark Calabretta wrote: > > On Tue 2012/01/24 16:23:17 PDT, Warner Losh wrote > in a message to: Leap Second Discussion List <[email protected]> > >>> In the latter, the second hand would move continuously past 60 to 01 >>> second and immediately flick back to 60, thus making it possible to >>> reckon time during a leap second. >> >> Or it could move from 00 back to 59... >> >> And the number of choices here is illustrative of the implementation >> details elsewhere :) > > TF460-6 specifies that time during a leap second be represented as, > for example, 23:59:60.7, which suggests to me that the second hand > should move past 60 to "61".
But then it would be in the wrong minute. What's the right answer: both. The standard is silent on the issue since there is no '60' on the clock. One can get the minute and hour wrong by repeating the first 6-degrees of the dial and have the 'wrap' be like you suggest. One can get the minute and hour right, but with a less "modulus"ly beautiful 60 - 00. There's no standard for mapping a non-uniform radix onto a uniform-radix device. Implementations on POSIX time_t based systems suffer similar ambiguity. Warner _______________________________________________ LEAPSECS mailing list [email protected] http://six.pairlist.net/mailman/listinfo/leapsecs
