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74 lines
2.7 KiB
Python
74 lines
2.7 KiB
Python
# 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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# 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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def timestamp2filetime(ts):
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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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>>> import calendar
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>>> "%.0f" % timestamp2filetime(calendar.timegm((2009, 7, 25, 23, 0, 0, 0, 0, 0)))
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'128930364000000000'
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>>> "%.0f" % timestamp2filetime(calendar.timegm((1970, 1, 1, 0, 0, 0, 0, 0)))
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'116444736000000000'
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>>> timestamp2filetime(calendar.timegm((2009, 7, 25, 23, 0, 0, 0, 0, 0)) + 0.001)
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128930364000010000
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"""
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return int(ts * HUNDREDS_OF_NANOSECONDS) + EPOCH_AS_FILETIME
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def filetime2timestamp(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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>>> filetime2timestamp(116444736000000000)
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0.0
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>>> filetime2timestamp(128930364000000000)
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1248562800.0
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>>> filetime2timestamp(128930364000001000)
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1248562800.0001
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"""
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# Get seconds and remainder in terms of Unix epoch
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return (ft - EPOCH_AS_FILETIME) / float(HUNDREDS_OF_NANOSECONDS)
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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