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106 lines
3.7 KiB
Python
106 lines
3.7 KiB
Python
#!/usr/bin/env python3
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# Copyright (c) 2009, David Buxton <david@gasmark6.com>
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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# IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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# TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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"""Tools to convert between Python datetime instances and Microsoft times.
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"""
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from datetime import datetime, timedelta, tzinfo
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from calendar import timegm
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# http://support.microsoft.com/kb/167296
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# How To Convert a UNIX time_t to a Win32 FILETIME or SYSTEMTIME
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EPOCH_AS_FILETIME = 116444736000000000 # January 1, 1970 as MS file time
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HUNDREDS_OF_NANOSECONDS = 10000000
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ZERO = timedelta(0)
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HOUR = timedelta(hours=1)
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class UTC(tzinfo):
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"""UTC"""
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def utcoffset(self, dt):
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return ZERO
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def tzname(self, dt):
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return "UTC"
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def dst(self, dt):
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return ZERO
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utc = UTC()
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def dt_to_filetime(dt):
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"""Converts a datetime to Microsoft filetime format. If the object is
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time zone-naive, it is forced to UTC before conversion.
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>>> "%.0f" % dt_to_filetime(datetime(2009, 7, 25, 23, 0))
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'128930364000000000'
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>>> "%.0f" % dt_to_filetime(datetime(1970, 1, 1, 0, 0, tzinfo=utc))
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'116444736000000000'
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>>> "%.0f" % dt_to_filetime(datetime(1970, 1, 1, 0, 0))
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'116444736000000000'
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>>> dt_to_filetime(datetime(2009, 7, 25, 23, 0, 0, 100))
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128930364000001000
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"""
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if (dt.tzinfo is None) or (dt.tzinfo.utcoffset(dt) is None):
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dt = dt.replace(tzinfo=utc)
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ft = EPOCH_AS_FILETIME + (timegm(dt.timetuple()) * HUNDREDS_OF_NANOSECONDS)
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return ft + (dt.microsecond * 10)
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def filetime_to_dt(ft):
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"""Converts a Microsoft filetime number to a Python datetime. The new
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datetime object is time zone-naive but is equivalent to tzinfo=utc.
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>>> filetime_to_dt(116444736000000000)
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datetime.datetime(1970, 1, 1, 0, 0)
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>>> filetime_to_dt(128930364000000000)
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datetime.datetime(2009, 7, 25, 23, 0)
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>>> filetime_to_dt(128930364000001000)
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datetime.datetime(2009, 7, 25, 23, 0, 0, 100)
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"""
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# Get seconds and remainder in terms of Unix epoch
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(s, ns100) = divmod(ft - EPOCH_AS_FILETIME, HUNDREDS_OF_NANOSECONDS)
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# Convert to datetime object
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dt = datetime.utcfromtimestamp(s)
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# Add remainder in as microseconds. Python 3.2 requires an integer
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dt = dt.replace(microsecond=(ns100 // 10))
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return dt
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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