At Fri, 3 Jun 2011 21:47:04 -0400, "Geoffrey S. Knauth" wrote: > Does any PLT Scheme or Racket code actually track or use > those leap seconds?
For some functions, it depends on the library and configuration provided by the OS. My impression is that leap seconds are typically not tracked. Specifically, the `find-seconds' function is implemented using `seconds->date', which is in turn implemented with localtime() and gmtime(). Whether leap seconds are taken into account by localtime() and gmtime() depends on whether the relevant timezone is configured to include leap-second corrections, and I think timezones are usually configured to omit the correction. Instead, most system rely on NTP to fix up a system's clock, so that the result of `current-seconds' becomes one less than the actual number of seconds that have elapsed since 1970. At least, that's how I think it works. I'm not completely certain beyond the fact that `seconds->date' uses localtime()/gmtime(). _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
