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