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import _winreg import struct import datetime handle = _winreg.ConnectRegistry(None, _winreg.HKEY_LOCAL_MACHINE) tzparent = _winreg.OpenKey(handle, "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones") parentsize = _winreg.QueryInfoKey(tzparent)[0] localkey = _winreg.OpenKey(handle, "SYSTEM\\CurrentControlSet\\Control\\TimeZoneInformation") WEEKS = datetime.timedelta(7) def list_timezones(): """Return a list of all time zones known to the system.""" l = [] for i in xrange(parentsize): l.append(_winreg.EnumKey(tzparent, i)) return l class win32tz(datetime.tzinfo): """tzinfo class based on win32's timezones available in the registry. >>> local = win32tz('Central Standard Time') >>> oct1 = datetime.datetime(month=10, year=2004, day=1, tzinfo=local) >>> dec1 = datetime.datetime(month=12, year=2004, day=1, tzinfo=local) >>> oct1.dst() datetime.timedelta(0, 3600) >>> dec1.dst() datetime.timedelta(0) >>> braz = win32tz('E. South America Standard Time') >>> braz.dst(oct1) datetime.timedelta(0) >>> braz.dst(dec1) datetime.timedelta(0, 3600) """ def __init__(self, name): self.data = win32tz_data(name) def utcoffset(self, dt): if self._isdst(dt): return datetime.timedelta(minutes=self.data.dstoffset) else: return datetime.timedelta(minutes=self.data.stdoffset) def dst(self, dt): if self._isdst(dt): minutes = self.data.dstoffset - self.data.stdoffset return datetime.timedelta(minutes=minutes) else: return datetime.timedelta(0) def tzname(self, dt): if self._isdst(dt): return self.data.dstname else: return self.data.stdname def _isdst(self, dt): dat = self.data dston = pickNthWeekday(dt.year, dat.dstmonth, dat.dstdayofweek, dat.dsthour, dat.dstminute, dat.dstweeknumber) dstoff = pickNthWeekday(dt.year, dat.stdmonth, dat.stddayofweek, dat.stdhour, dat.stdminute, dat.stdweeknumber) if dston < dstoff: return (dston <= dt.replace(tzinfo=None) < dstoff) else: return not (dstoff <= dt.replace(tzinfo=None) < dston) def __repr__(self): return "<win32tz - {0!s}>".format(self.data.display) def pickNthWeekday(year, month, dayofweek, hour, minute, whichweek): """dayofweek == 0 means Sunday, whichweek > 4 means last instance""" first = datetime.datetime(year=year, month=month, hour=hour, minute=minute, day=1) weekdayone = first.replace(day=((dayofweek - first.isoweekday()) % 7 + 1)) for n in xrange(whichweek - 1, -1, -1): dt = weekdayone + n * WEEKS if dt.month == month: return dt class win32tz_data(object): """Read a registry key for a timezone, expose its contents.""" def __init__(self, path): """Load path, or if path is empty, load local time.""" if path: keydict = valuesToDict(_winreg.OpenKey(tzparent, path)) self.display = keydict['Display'] self.dstname = keydict['Dlt'] self.stdname = keydict['Std'] #see http://ww_winreg.jsiinc.com/SUBA/tip0300/rh0398.htm tup = struct.unpack('=3l16h', keydict['TZI']) self.stdoffset = -tup[0] - tup[1] # Bias + StandardBias * -1 self.dstoffset = self.stdoffset - tup[2] # + DaylightBias * -1 offset = 3 self.stdmonth = tup[1 + offset] self.stddayofweek = tup[2 + offset] # Sunday=0 self.stdweeknumber = tup[3 + offset] # Last = 5 self.stdhour = tup[4 + offset] self.stdminute = tup[5 + offset] offset = 11 self.dstmonth = tup[1 + offset] self.dstdayofweek = tup[2 + offset] # Sunday=0 self.dstweeknumber = tup[3 + offset] # Last = 5 self.dsthour = tup[4 + offset] self.dstminute = tup[5 + offset] else: keydict = valuesToDict(localkey) self.stdname = keydict['StandardName'] self.dstname = keydict['DaylightName'] sourcekey = _winreg.OpenKey(tzparent, self.stdname) self.display = valuesToDict(sourcekey)['Display'] self.stdoffset = -keydict['Bias'] - keydict['StandardBias'] self.dstoffset = self.stdoffset - keydict['DaylightBias'] #see http://ww_winreg.jsiinc.com/SUBA/tip0300/rh0398.htm tup = struct.unpack('=8h', keydict['StandardStart']) offset = 0 self.stdmonth = tup[1 + offset] self.stddayofweek = tup[2 + offset] # Sunday=0 self.stdweeknumber = tup[3 + offset] # Last = 5 self.stdhour = tup[4 + offset] self.stdminute = tup[5 + offset] tup = struct.unpack('=8h', keydict['DaylightStart']) self.dstmonth = tup[1 + offset] self.dstdayofweek = tup[2 + offset] # Sunday=0 self.dstweeknumber = tup[3 + offset] # Last = 5 self.dsthour = tup[4 + offset] self.dstminute = tup[5 + offset] def valuesToDict(key): """Convert a registry key's values to a dictionary.""" d = {} size = _winreg.QueryInfoKey(key)[1] for i in xrange(size): d[_winreg.EnumValue(key, i)[0]] = _winreg.EnumValue(key, i)[1] return d def _test(): import win32tz, doctest doctest.testmod(win32tz, verbose=0) if __name__ == '__main__': _test()