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In Ruby, on Halloween:
Date.today - 6.months + 6.months != Date.today
Do we need to update Ruby’s date implementation? Do other languages have the same issue?
This happens if you do it to any month that doesn’t have 31 days (i.e. 3 months would work just fine, but 1 month, or 6, or 8 would all make this happen).
If you do
Date.today - 1.month, it looks like Rails sees that 9/31/2011 isn’t a valid date, so it kicks it back an extra day to make it a valid date. However, when you go one month forward from the end of September, it’ll leave it at 10/30/2011 since that’s a valid date. Basically, Rails just tries to increment (or decrement) the month field and as long as it’s a valid date, it won’t adjust the day field.One way to work around this is to use the
.end_of_month(or.beginning_of_month) method on aDateobject in Rails to make sure you’re consistently getting the end or beginning of a month.