Re: [tz] may be a small mistake in the localtime.c code

Olson, Arthur David (NIH/NCI) [E] wrote:

For (so far unused in the real word) double leap seconds,

There ain't no such thing. The C standardisation committee, needing to precisely define struct tm, got misled by the fact that current procedures allow for up to two leap seconds per *year*, and mistakenly thought that the two leap seconds could occur on in the same minute. In fact the definition of UTC only allows for one leap second at a time, always at the end of a Gregorian month (so up to twelve per year, if the current preferences between months were overridden). The latest C and POSIX specs are clear that tm_sec only goes up to 60. -zefram