On Sunday / Sunday

I found it on CNN.com. American English is so different from British English. Here is an example as follows:

E.g.:Envoys to deadlocked North Korean nuclear talks will take a recess, the Chinese government announced Sunday, without giving a date for negotiations to resume.

"ON" is missing in the sentence. I am wondering if it is acceptable from a grammatical point of view.

And, If the British see this kind of sentence, will they regard it as completely wrong?

Eimai_Anglos wrote:

As a native Br. English speaker, this looks like a lazy American construction. I would not find it acceptable. At the very least, I would expect two commas: "... announced, Sunday, that ...".

As a 'colonist', I don't see anything lazy about it.  It's just a difference that has evolved over the years.  The use of 'on' with a day of the week is common here across the pond; I don't think anyone here sees the difference as lazy.