How can i custom this kind of date

[Accidentals_genius]

How can I custom this kind of date in format cells

what do I type in the Type box 

Wednesday, March 14, 2012

[#2 · Accepted solution]

@Accidentals_genius Try this:
dddd, mmmm dd, yyyy

[#3]

thank you for your reply but it returned as Wednesday, Jul 27, 2016
can you make the "month" not being short

[#4]

oh i did it, thank you so much