TimeStamp format

Many of us use the time format in our code

But very few of us knows the meaning of using the format.

Here is the explaination of these codes,very useful --- 

TimeStamp format as follows:
H = 24 Hour
HH = 24 Hour with leading zero
h = 12 Hour
hh = 12 Hour with leading zero
m = Minutes
mm = Minutes with leading zero
s = Seconds
ss = Seconds with leading zero
t = A/P
tt = AM/PM

Example:

[H:mm]------------->[23:59] (24 hour time)
[h:mm]------------->[11:59] (12 hour time)
[H:mm:ss]--------->[23:59:59] (24 hour with seconds counter)
[h:mm:ss]--------->[11:59:59] (12 hour with seconds counter)
[H:mm:sstt]------->[23:59:59pm] (24 hour with seconds counter and AM/PM) but its 24 hour, you shouldnt need it.
[h:mm:sstt]------->[11:59:59] (12 hour with seconds counter and AM/PM)

You are not required to use the [Square Bracket notation] you may use anything just so long as it contains a TimeStamp format. Note: Please ensure that you use the correct case (UPPER/lower)