datetime.strptime with %f loses precision below milliseconds

[pekkaklarck]

C:\Users\peke>ipy
IronPython 2.7.5 (2.7.5.0) on .NET 4.0.30319.18444 (32-bit)
Type "help", "copyright", "credits" or "license" for more information.
>>> from datetime import datetime
>>> datetime.strptime("2013-11-29T16:38:12.507666", "%Y-%m-%dT%H:%M:%S.%f")
datetime.datetime(2013, 11, 29, 16, 38, 12, 507000)
>>>

C:\Users\peke>python
Python 2.7.3 (default, Apr 10 2012, 23:24:47) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from datetime import datetime
>>> datetime.strptime("2013-11-29T16:38:12.507666", "%Y-%m-%dT%H:%M:%S.%f")
datetime.datetime(2013, 11, 29, 16, 38, 12, 507666)
>>>

Notice that prior to IronPython 2.7.5 datetime.strptime didn't support %f at all:
https://ironpython.codeplex.com/workitem/34706

[pekkaklarck]

This problem with fromtimestamp is probably related:

IronPython 2.7.5 (2.7.5.0) on .NET 4.0.30319.18444 (32-bit)
Type "help", "copyright", "credits" or "license" for more information.
>>> from datetime import datetime
>>> datetime.fromtimestamp(1399410716.123).microsecond
122000

IIRC, the above returned 122999 with earlier IronPython versions. IPY 2.7.5 dropping precision below milliseconds would explain how that is turned into 122000.