1 """

     2     Miscellanous bucket of everything

     3 """

     4 

     5 import datetime

     6 import time

     7 

     8 class LocalTimezone (datetime.tzinfo) :

     9     """

    10         Our platform's (the 'time' module) idea of our local timezone.

    11     """

    12 

    13     ZERO = datetime.timedelta(0)

    14 

    15     STDOFFSET = datetime.timedelta(seconds = -time.timezone)

    16 

    17     if time.daylight:

    18         DSTOFFSET = datetime.timedelta(seconds = -time.altzone)

    19     else:

    20         DSTOFFSET = STDOFFSET

    21 

    22     DSTDIFF = DSTOFFSET - STDOFFSET

    23 

    24     def _isdst (self, dt) :

    25         # time tuple in local time

    26         tt = (dt.year, dt.month, dt.day,

    27               dt.hour, dt.minute, dt.second,

    28               dt.weekday(), 0, -1)

    29         

    30         # to UTC timestamp

    31         stamp = time.mktime(tt)

    32         

    33         # roundtrip..

    34         tt = time.localtime(stamp)

    35         

    36         # to figure out DST flag

    37         return tt.tm_isdst > 0

    38 

    39     def utcoffset (self, dt) :

    40         if self._isdst(dt) :

    41             return self.DSTOFFSET

    42         else:

    43             return self.STDOFFSET

    44 

    45     def dst (self, dt) :

    46         if self._isdst(dt) :

    47             return self.DSTDIFF

    48         else:

    49             return self.ZERO

    50 

    51     def tzname (self, dt) :

    52         # varies by DST

    53         return time.tzname[self._isdst(dt)]

    54 

    55