Datetime question

[Rama]

>
> > In a datetime object I would like to change days and hours.
>
> you'd been pointed to the resources yesterday - please read manuals
> carefully!
>
> a = datetime.datetime(2006, 8, 12, 10, 13, 56, 609000)
> b = a + datetime.timedelta(days=-2, hours=-4)


<Newbie Question>

But wont this create a new object? Whereas if you want to modify the same
object, should we not be using replace? Or does it not matter in the global
picture?

>>> a = datetime.datetime(2006, 8, 12, 10, 13, 56, 609000)
>>> b = a + datetime.timedelta(days=-2, hours=-4)
>>>
>>>
>>> id(a)
21838592
>>> id(b)
21836312
>>> a.replace(day=a.day + 1)
datetime.datetime(2006, 8, 13, 10, 13, 56, 609000)
>>> id(a)
21838592
>>>

</Newbie Question>

thanks,
Rama
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