datum = '2011-03-21'
#1. Berechnung => OK
zeitraum = (datetime.date.today() - datetime.timedelta(10)).strftime('%Y-%m-%d')
>>> 2011-03-11
#2. Berechnung => Nicht OK
zeitraum = (datum - datetime.timedelta(10)).strftime('%Y-%m-%d')
>>> TypeError: unsupported operand type(s) for -: 'str' and 'datetime.timedelta'
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>>> import datetime
>>> import time
>>> from datetime import datetime
>>> from datetime import timedelta
>>> from time import mktime
>>> datum = '2011-03-21'
>>> datum1 = time.strptime(datum, '%Y-%m-%d')
>>> datum2 = (datetime.fromtimestamp(mktime(datum1)) - timedelta(10))
>>> datum2.strftime('%Y-%m-%d')
'2011-03-11'
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