On Apr 8, 1:54 am, Jamie Wilkinson <[email protected]> wrote: > I don't understand what you mean; TAI has been around since 1955. > What is special about next month that we go back to 1955?
TAI can be extrapolated back to 1955, but it has only existed since 1971, and for all practical purposes it was irrelevant to any time stamp until 1972. TAI is not defined for any instant until the publication of the issue of BIPM Circular T that covers that instant. Circular T is published monthly. It is not possible to assert the value of TAI now, only some approximation of TAI. Only BIPM can assert what is or is not TAI lest things get confused as people start abusing phrases such as "official TAI" as made distinct from something which is not TAI but which gets called TAI. http://www.bipm.org/jsp/en/TimeFtp.jsp?TypePub=publication#TAIPubFormPubli2 > > That exists and it's called zoneinfo and it gets updated all the > > time as a result of arbitrary and unpredictable human fiat. > > zoneinfo is for timezones, it doesn't convert between timescales. At a technical level I don't see a substantive difference. POSIX demands that zoneinfo handle offsets of seconds. -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
