Keith Roberts <ke...@karsites.net> wrote: > From: http://www.sqlite.org/lang_datefunc.html > > "Thus, for example, the data 2001-03-31 modified by '+1 > month' initially yields 2001-04-31, but April only has 30 > days so the date is normalized to 2001-05-01." > > When I add '+1 month' to the example data, the example date > has 31 days added to it. Which is correct. > > When I subtract '-1 month' the date only gets 28 days > subtracted from it.
By the same logic, subtracting one month from 2001-03-31 leads to 2001-02-31, but Feburary only has 28 days, so this gets normalized to 2001-03-03. It's not about the number of days. If you want to add or subtract a particular number of days, say so. > Surely adding or subtracting a month modifier to a date > should be the same number of days in each direction? If that were the case, then these two equalities could not be both true: date('2001-03-01', '-1 month') = '2001-02-01' date('2001-03-01', '+1 month') = '2001-04-01' Which one of the above do you believe is incorrect? Igor Tandetnik _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users