I was testing the input_date_tag WITHOUT rich text, and I noticed that the values generated for the html select for months and days go without a leading zero.
For exemple (1 => January, 2 => February, etc). Instead of 01 => January, 02 => February...
I'm currently using sqlite and there's a major problem with it. Because for Sqlite a date like 2007-01-01 is different from 2007-1-1. In fact the second form does not work at all, apparently sqlite does not support date data type.
Botton line, I think it would be nice to have an option for the input_date tag called 'leading_zero', which would put the leading zeros for values from 1-9.