How about make it simple by using sorted(a.values()) ...
>>> a = {}
>>> a['first'] = datetime.datetime.now()
>>> a['second'] = datetime.datetime.now()
>>> a['third'] = datetime.datetime.now()
>>> a['forth'] = datetime.datetime.now()
>>> a['fifth'] = datetime.datetime.now()
>>> sorted(a.values())
[datetime.datetime(2014, 2, 10, 19, 24, 35, 163585), datetime.datetime(2014, 2,
10, 19, 24, 53, 244532), datetime.datetime(2014, 2, 10, 19, 25, 9, 483683),
datetime.datetime(2014, 2, 10, 19, 25, 25, 581743), datetime.datetime(2014, 2,
10, 19, 25, 37, 789907)]
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