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I've stumbled over an odd datetime.weekday() behaviour in Python 2.7.8 (default, Jun 18 2015, 18:54:19) [GCC 4.9.1] on linux2) under Ubuntu. weekday() is off by 1.
Code to reproduce:
from datetime import datetime
date = datetime.utcfromtimestamp(int('1410446564')) # datetime.datetime(2014, 9, 11, 14, 42, 44)
date.weekday() # should be 4, not 3
I can reproduce this behaviour on our dev and production systems, and just tested it locally with python 3.4.3.
Since I'm not a smart man, I might overlook something silly...