[Info-vax] EU will abandon daylight savings time in 2021

[John Reagan]

On Thursday, March 28, 2019 at 3:20:18 PM UTC-4, Dave Froble wrote:
> On 3/28/2019 3:00 PM, Stephen Hoffman wrote:
> > On 2019-03-28 18:39:34 +0000, John Reagan said:
> >
> >> ...and figure out that format.
> >
> > There's no need to rummage the constituent files.
> >
> > Use the tz-related tools; zic and friends.
> >
> > Quite possibly download the current set of the timezone files as part of
> > each system build, and as part of any UPDATE kitting y'all might be
> > planning.
> >
> > Reading:
> > http://www.hoffmanlabs.com/vmsfaq/vmsfaq_005.html#timezic
> > https://www.iana.org/time-zones
> > https://en.wikipedia.org/wiki/Tz_database
> >
> >
> >
> 
> Why?
> 
> Why is it incumbent upon the OS vendor to have to do all the TZ stuff?
> 
> Don't know if it works on later versions, but, on WEENDOZE XP I have a 
> utility that sets the two dates and times when DST is enabled or 
> disabled.  I'm happy with it, and, if there is a problem (dummy forget 
> to set up new TZ rules) it's my problem.
> 
> Sure beats some OS vendor patch or such.
> 
> KISS !
> 
> And if some dummy cannot do something so simple, well, that's why he's 
> suppose to be paying me the big bucks.
> 
> -- 
> David Froble                       Tel: 724-529-0450
> Dave Froble Enterprises, Inc.      E-Mail: davef at tsoft-inc.com
> DFE Ultralights, Inc.
> 170 Grimplin Road
> Vanderbilt, PA  15486

It isn't quite that simple as just the current time.  You still need to be able to difftime() and get the # of seconds between two dates.  You have to know if those dates are using DST or not even after 2021 rolls around.  Think about how to compute the difference between a 12:00 in New York City on March 1st to 12:00 in Sydney on Nov 1st.  Those TZ files have a full history of all the different timezones.