Zone Antarctica/Palmer is currently defined as -

# Zone        NAME                GMTOFF        RULES        FORMAT        [UNTIL]
Zone Antarctica/Palmer        0        -        zzz        1965
                        -4:00        ArgAQ        AR%sT        1969 Oct 5
                        -3:00        ArgAQ        AR%sT        1982 May
                        -4:00        ChileAQ        CL%sT

The comment mentions that Palmer station keeps the same time as Punta Arenas, Chile.

# From Ethan Dicks (1996-10-06):
# It keeps the same time as Punta Arenas, Chile, because, just like us
# and the South Pole, that's the other end of their supply line....
# I verified with someone who was there that since 1980,
# Palmer has followed Chile.  Prior to that, before the Falklands War,
# Palmer used to be supplied from Argentina.

The rule ChileAQ in antarctica was copied from southamerica file and the current effective rules are below -

Rule        ChileAQ        1999        max        -        Oct        Sun>=9        4:00u        1:00        S
Rule        ChileAQ        2000        max        -        Mar        Sun>=9        3:00u        0        -

However, Rule Chile in southamerica was updated in 2008a, 2010d, 2011c and 2011e. The rules for Chile after 1999 are defined as below in the current version.

Rule        Chile        1999        2010        -        Oct        Sun>=9        4:00u        1:00        S
Rule        Chile        2011        only        -        Aug        Sun>=16        4:00u        1:00        S
Rule        Chile        2012        max        -        Oct        Sun>=9        4:00u        1:00        S
Rule        Chile        2000        2007        -        Mar        Sun>=9        3:00u        0        -
# N.B.: the end of March 29 in Chile is March 30 in Universal time,
# which is used below in specifying the transition.
Rule        Chile        2008        only        -        Mar        30        3:00u        0        -
Rule        Chile        2009        only        -        Mar        Sun>=9        3:00u        0        -
Rule        Chile        2010        only        -        Apr        Sun>=1        3:00u        0        -
Rule        Chile        2011        only        -        May        Sun>=2        3:00u        0        -
Rule        Chile        2012        max        -        Mar        Sun>=9        3:00u        0        -

If the comment for Antarctica/Palmer is still true, then I think ChileAQ in antarctica should be also updated. Does anyone know if ChileAQ in antarctica was intentionally unchanged or, it's just an error?


Thanks,
Yoshito