dateutil に感動した

python 
>>> from datetime import datetime
>>> from dateutil.relativedelta import relativedelta
>>> now = datetime.now()
datetime.datetime(2009, 4, 22, 15, 1, 2, 502637)
>>> now + relativedelta(days=+1)
datetime.datetime(2009, 4, 23, 15, 1, 2, 502637)
>>> now + relativedelta(days=+0.5)
datetime.datetime(2009, 4, 23, 3, 1, 2, 502637)
>>> now + relativedelta(days=+0.3)
datetime.datetime(2009, 4, 22, 22, 13, 2, 502637)

標準化して欲しい。