Why does parsing '23:00 PM' with SimpleDateFormat(“hh:mm aa”) return 11 a.m.?

Question

Why does parsing \'23:00 PM\' with SimpleDateFormat(\"hh:mm aa\") return 11 a.m.?

Answer 1

Here are the formatting options specifed in the javadoc

H     Hour in day (0-23)    
k   Hour in day (1-24)  
K   Hour in am/pm (0-11)    
h   Hour in am/pm (1-12) 

Notice that "h" would be for hours 1-12. If you want to handle 1-24, try "k". for 0-23 try "H". But I would not expect valid results if you are putting in impossible data.