Hello, sameeerali — and welcome to English Forums. 'Yesternight' (like 'yestereven') is not a new word but an old word, no longer used except in poetry, for instance. It means 'last night'.
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sameeerali but I was asking that is it formal or infromal to use in official mailsDid you read my post? I have just told you that it is no longer used except in poetry. Are you composing a poem for official mail?
sameeeraliwhat does it mean "yestereven" ?I think you can guess that one, sameeerali—what do you think?
sameeeraliso now I understand that i can use the word "yesternight" in fb postsGood idea. You can use most anything at FB.
sameeeraliits changing and changing..It's not changing that fast.
sameeeralii wanna learn new styles..I suggest that you perfect standard English first.