Date format for disc labels

[Guest Loren Jones]

I would like the option of a $yr metatag for a two-digit year along with the $year 4-digit year option. Also, I haven't confirmed the latest version's handling of time, but the $hour and $minute tags should always use two digits for formatting consistency (01 instead of 1 for 1 a.m.)

Thanks.

[floele]

I'll add "$yr", $minute and $hour are already two digits.