Mask option: date?

[John Doe]

Stick the masks in a mask file: https://hashcat.net/wiki/doku.php?id=mas...mask_files

How will this help? AFAIKS that's automating the problem with an inefficient key space.
What I'm actually looking for is something like:

-1 {01,02,03..,31}
-2 {01,02,03..,12}
-3 {1970,1971,1972..,2016}

And crack dates (DDMMYYYY) with ?1?2?3, with DDMM within 9 bits.

Cheers,

John