On 2014-04-06 14:21, Ben Finney wrote:
> I assume you mean you will be creating ‘datetime.date’ objects. What
> will you set as the month and day?
>
> Alternatively, if you just want to do integer arithmetic on the
> year, you don't need the ‘datetime’ module at all.
Even if you do the arithmetic by hand, it's still nice to use the
datetime module to parse for sane dates:
year = 2004
month = 2
day = 29
what should month & day be if you increment/decrement the year by
one? The datetime module will throw a ValueError which is a nice
check for a valid date. I've had to do things like this in a loop to
sanitize dates (depending on which field is being inc/dec'ed, by how
much, and which direction it's going) and it's nice to just have a
y,m,d = initial = some_date.timetuple()[:3] #
result = None
while result is None:
y,m,d = twiddle(y, m, d)
try:
result = datetime(y, m, d)
except ValueError:
result = None
log.info("Shifted %r -> %r", initial, result)
where twiddle() is whatever business logic I need for this particular
case. For me usually, it's adjusting by one month for billing
purposes.
-tkc
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