http://robots.thoughtbot.com/post/12890232727/how-to-find-a-time-format-for-rubys-strftime
a Tue Thu Sat
b Nov Nov Dec
c Tue Nov 1 00:00:00 2011 Thu Nov 17 00:14:27 2011 Sat Dec 31 23:59:59 2011
d 01 17 31
e 1 17 31
f %f %f %f
g 11 11 11
h Nov Nov Dec
i %i %i %i
j 305 321 365
k 0 0 23
l 12 12 11
m 11 11 12
n
o %o %o %o
p AM AM PM
q %q %q %q
r 12:00:00 AM 12:14:27 AM 11:59:59 PM
s 1320120000 1321506867 1325393999
t
u 2 4 6
v 1-NOV-2011 17-NOV-2011 31-DEC-2011
w 2 4 6
x 11/01/11 11/17/11 12/31/11
y 11 11 11
z -0400 -0500 -0500
A Tuesday Thursday Saturday
B November November December
C 20 20 20
D 11/01/11 11/17/11 12/31/11
E %E %E %E
F 2011-11-01 2011-11-17 2011-12-31
G 2011 2011 2011
H 00 00 23
I 12 12 11
J %J %J %J
K %K %K %K
L 000 599 999
M 00 14 59
N 000000000 599545000 999999998
O %O %O %O
P am am pm
Q %Q %Q %Q
R 00:00 00:14 23:59
S 00 27 59
T 00:00:00 00:14:27 23:59:59
U 44 46 52
V 44 46 52
W 44 46 52
X 00:00:00 00:14:27 23:59:59
Y 2011 2011 2011
Z EDT EST EST