Dear IANA TZ,
Since the last time change Chile has been in GMT-3 (i.e. Chile is right
now in GMT-3).
Chile is going to GMT-4 in May,14th midnight and returning to GMT-3 in
August, 13th midnight.
That means clocks will go back 1 hour at 00:00 May 15th (jumping back to
May 14th); and will go forward by 1 hour on 00:00, August 14th.
In tzdata2016c I can see this new rules for Chile:
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Chile 2016 max - May Sun>=9 3:00u 0 -
Rule Chile 2016 max - Aug Sun>=9 4:00u 1:00 S
And I can see this Chile zone definition:
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Santiago -4:42:46 - LMT 1890
-4:42:46 - SMT 1910 Jan 10 # Santiago Mean Time
-5:00 - CLT 1916 Jul 1 # Chile Time
-4:42:46 - SMT 1918 Sep 10
-4:00 - CLT 1919 Jul 1
-4:42:46 - SMT 1927 Sep 1
-5:00 Chile CL%sT 1932 Sep 1
-4:00 - CLT 1942 Jun 1
-5:00 - CLT 1942 Aug 1
-4:00 - CLT 1946 Jul 15
-4:00 1:00 CLST 1946 Sep 1 # central Chile
-4:00 - CLT 1947 Apr 1
-5:00 - CLT 1947 May 21 23:00
-4:00 Chile CL%sT
But with these two information I'm not sure that in the midnight of May,
14th this tzdata2016c will change the TZ of Chile from GMT-3 to GMT-4.
Can you please explain me how these structures in tzdata2016c work to
accomplish the necessary TZ change in Chile.
Thank you very much, best regards.
Luis