Python for Windows extensions

Tracker: Bugs

5 PyTime's .msec method always returns 0 - ID: 2209864

Last Update: Comment added ( davidfraser )

Details:

PyTime stores times internally as DATE objects, which support fractional
second resolution (since they are just a double number of days).

However the method to retrieve attributes including msec uses the Win32
VariantTimeToSystemTime function to convert the m_time to a SYSTEMTIME.

This function is known not to convert the fractional part of seconds (see
http://support.microsoft.com/kb/297463, and
http://www.codeproject.com/KB/datetime/SysTimeToVarTimeWMillisec.aspx for
some example workaround code).

So although the fractional part is actually stored in the PyTime object, it
cannot be retrieved.

Submitted:

David Fraser ( davidfraser ) - 2008-10-30 14:36

Priority:

Status:

Open

Resolution:

None

Assigned:

Nobody/Anonymous

Category:

win32

Group:

None

Visibility:

Public

Comments ( 2 )

Date: 2008-10-30 15:06 Sender: davidfraser I've attached a very simple patch that calculates the .msec value on request. Note that since .msec has never returned anything but 0, and the builtin datetime object has a microsecond attribute, it may be worthwhile to repurpose this .msec attribute to mean "microseconds" rather than "seconds" It would also be worthwhile to patch the various Time constructors to ensure that they preserve sub-second resolution if given (e.g. pywintypes.Time(time.time()) currently discards it) File Added: pywin32-pytime-calc-msec.patch
Date: 2008-10-30 14:47 Sender: davidfraser A fairly simple workaround is to convert the PyTime directly to a float. For example, the following code converts to datetime: def WinPyTimeToDate(pytime): """Converts a pywintypes.PyTime object into a date object""" microseconds = int(((float(pytime)246060) % 1)1000000) return date(pytime.year, pytime.month, pytime.day, pytime.hour, pytime.minute, pytime.second, microseconds)

Date: 2008-10-30 15:06
Sender: davidfraser

I've attached a very simple patch that calculates the .msec value on
request.
Note that since .msec has never returned anything but 0, and the builtin
datetime object has a microsecond attribute, it may be worthwhile to
repurpose this .msec attribute to mean "microseconds" rather than
"seconds"

It would also be worthwhile to patch the various Time constructors to
ensure that they preserve sub-second resolution if given (e.g.
pywintypes.Time(time.time()) currently discards it)
File Added: pywin32-pytime-calc-msec.patch

Date: 2008-10-30 14:47
Sender: davidfraser

A fairly simple workaround is to convert the PyTime directly to a float.
For example, the following code converts to datetime:

def WinPyTimeToDate(pytime):
"""Converts a pywintypes.PyTime object into a date object"""
microseconds = int(((float(pytime)*24*60*60) % 1)*1000000)
return date(pytime.year, pytime.month, pytime.day, pytime.hour,
pytime.minute, pytime.second, microseconds)

Attached File ( 1 )

Filename	Description	Download
pywin32-pytime-calc-msec.patch	Patch to PyTime.cpp to calculate milliseconds	Download

Change ( 1 )

Field	Old Value	Date	By
File Added	299550: pywin32-pytime-calc-msec.patch	2008-10-30 15:06	davidfraser

Python for Windows extensions

Tracker: Bugs

Comments ( 2 )

Attached File ( 1 )

Change ( 1 )

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