Next to that option in your profile is the text:
"The syntax used is identical to the PHP date() function" and there, as well as here, the underlined "date()" part is a link to an explanation of the codes used.
So, "D M d, Y g:i a" means:
D - textual representation of a day, three letters (Mon through Sun)
M - short textual representation of a month, three letters (Jan through Dec)
d - day of the month, 2 digits with leading zeros (01 to 31)
, - a literal comma
Y - full numeric representation of a year, 4 digits
g - 12-hour format of an hour without leading zeros
: - a literal colon
i - minutes with leading zeros
a - lower-case am or pm as appropriate
The spaces between these symbols are also used literally.
Therefore: "Mon Jun 16, 2014 10:42 am"
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Giraffe: a ruminant with a view.
16 Jun 2014, 4:19 am
