date format - long system date with

[william humphrey]

I notice that the dates can be formated like yyyy-m-d but I don't see how to
format them yyyy-mm-dd or for example you can get 2007-1-5 but can't get
2007-01-05 because you have a choice of %m for the number of the month but
not to tell it %mm or something to make sure the zero is there.
Please tell me what I am not seeing?  I am experimenting with getting the
useSystemDate function correctly but have old values that need to be
converted (that are missing the leading zeros).