There have been a number of changes to DateTime since Zope 1.9. Many of these related to numeric/date conversion and math. We are going to make a 1.10 pre-release today. Please see if the new DateTime gives you any trouble. It did the right thing for me with the expressions below. Jim Ty Sarna wrote:

I'm getting unexpected results when doing computations on DateTime instances. For example, the following should always result in 'd' being the first of the previous month to 'date':

d = date - date.day() # 1999/5/14 - 13 = 1999/4/30 d = d - (d.day() - 1) # 1999/4/30 - (30 - 1) = # 1999/4/30 - 29 = 1999/4/1

Thie works great, unless 'date' is in May, in which case I end up with 1999/3/31 instead. A similar computation to find the first of the next month also gives strange results if the start date is in March. In other words, if the correct result is April Fool's, I get something else instead!

Another, more involved set of calculations gives incorrect results for most dates in October, but is fine for any other month. What's going on?

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