holli++ - very useful
For the sake of completeness, here's sample output:
a: Day of Week (short, text) Thu
A: Day of Week (long, text) Thursday
b: Monthname (short, text) Feb
B: Monthname (long, text) February
c: Full datetime (number, long) 02/24/2005 12:53:26 PM
d: Day (number) 24
H: Hour (24 hour) (number) 12
I: Hour (12 hour) (number) 12
j: Day of year (number) 055
m: Month (number) 02
M: Minutes (number) 53
p: am/pm/empty (text) PM
S: Seconds (number) 26
U: Week of Year (number) 08
w: Day of week (number) 4
W: Week of Year (number) 08
x: date (number) 02/24/2005
X: time (number) 12:53:26 PM
y: year (short, number) 05
Y: year (long, number) 2005
Z: timezone (text) Pacific Standard Time
Update: This is a Win2K system, Locale set to English(US)