On Sun, 12 Mar 2023 18:28:35 -0500, Paul Gilmartin <[email protected]> wrote:
> >The PoOps says: > The former term, Greenwich Mean Time (GMT), is now obsolete and > has been replaced with the more precise UTC. > >( Do they mean to say "more precise" or "more accuratre"?) GMT is (was?) >Mean Solar Time at the Prime Meridian. UTC is atomic time (TAI) adjusted >by occasional by occasional Leap Seconds. Why is one called "more precise" >than the other? Perhaps they mean the term GMT is not precise, in that as you say GMT is astronomical time, UTC is atomic time. However GMT is also a time zone, so if you are, for example, in Iceland the time zone is GMT but any clocks are set to UTC. Same in the UK, so whilst as far as I can ascertain, the legal definition of UK time is GMT but in practice all our clocks are set to UTC. However whilst UTC is un-ambiguous, I am pretty sure if you return a time in UTC to a UK user 95% of them will have no idea what it means. > >Should the Assembler Services Ref. mention that GMT is obsolete and should >be deprecated? > I think it should explain the issue. >If an administrator in my timezone, (POSIX) MST7MDT,M3.2.0,M11.1.0 wishes >tomorrow to convert a timestamp recorded yesterday to displayable UTC and >local time, what services does z/OS provide? > >-- >gil > Dave ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
