java.text.SimpleDateFormat

Let  Date or Time          Component   Presentation Examples
G    Era designator        Text        AD
y    Year                  Year        1996; 96
M    Month in year         Month       July; Jul; 07
w    Week in year          Number      27
W    Week in month         Number      2
D    Day in year           Number      189
d    Day in month          Number      10
F    Day of week in month  Number      2
E    Day in week           Text        Tuesday; Tue
a    Am/pm marker          Text        PM
H    Hour in day (0-23)    Number      0
k    Hour in day (1-24)    Number      24
K    Hour in am/pm (0-11)  Number      0
h    Hour in am/pm (1-12)  Number      12
m    Minute in hour        Number      30
s    Second in minute      Number      55
S    Millisecond           Number      978
z    Time zone             General     GMT-08:00
Z    Time zone             RFC 822     -0800