timezone argument %z and %Z

[luofeiyu]

I feel it is necessary to start a new post to go on the discussion about 
timezone.

In my system : win7+ python3.4 .
related  official material.
https://docs.python.org/3.4/library/datetime.html#strftime-and-strptime
%z 	UTC offset in the form +HHMM or -HHMM (empty string if the the 
object is naive). 	(empty), +0000, -0400, +1030 	(6)
%Z 	Time zone name (empty string if the object is naive). 	(empty), UTC, 
EST, CST 	


1.%z  (lowercase)

import datetime
t1='Sat, 09 Aug 2014 07:36:46 -0700'     # - is after      backword
t2='Sat, 09 Aug 2014 07:36:46 +0700'    #+ is before   foreward
dt1=datetime.datetime.strptime(t1,"%a, %d %b %Y %H:%M:%S %z")
dt2=datetime.datetime.strptime(t2,"%a, %d %b %Y %H:%M:%S %z")
dt1.astimezone(datetime.timezone.utc)
datetime.datetime(2014, 8, 9, 14, 36, 46, tzinfo=datetime.timezone.utc)
  dt2.astimezone(datetime.timezone.utc)
datetime.datetime(2014, 8, 9, 0, 36, 46, tzinfo=datetime.timezone.utc)

%z is sovled by our community.

2.%Z  (uppercase)   Time zone name

problem 1:
There are 24 time zone in the world, does any time zone has the time 
zone name  such as EST,CST ?
Are there 24  time zone  abbreviations in python  ?what are other 22 
except for  EST ,CST ?

problem 2:
t3='Sat, 09 Aug 2014 07:36:46 EST'
dt3=datetime.datetime.strptime(t3,"%a, %d %b %Y %H:%M:%S %Z")
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File "D:\Python34\lib\_strptime.py", line 500, in _strptime_datetime
     tt, fraction = _strptime(data_string, format)
   File "D:\Python34\lib\_strptime.py", line 337, in _strptime
     (data_string, format))
ValueError: time data 'Sat, 09 Aug 2014 07:36:46 EST' does not match 
format '%a,
  %d %b %Y %H:%M:%S %Z'

does %Z  remain problem?is it a bug in python datetime module?







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