The first example will get you what you need, the others are just for reference:
Q: (year of it as string & month of it as two digits & day_of_month of it as string) of current date & “-” & concatenation of characters (0; 1; 3; 4) of (current time_of_day as string)
A: 20090521-0933
Q: concatenation of characters (0; 1; 3; 4; 6; 7) of (current time_of_day as string)
A: 091055
Q: current time_of_day (local time zone)
A: 09:10:55 -0700
Q: time of current time_of_day
A: 09:10:55
Q: two digit hour of time (local time zone) of now
A: 09
Q: two digit minute of time (local time zone) of now
A: 10
Q: two digit second of time (local time zone) of now