If it’s daytime you can say: at midday / at midday; at noon / at noon.
如果是白天你可以说:at midday /在正午;atnoon /在中午。
The mayor of Munich, Christian Ude, will get the ball rolling at midday on Saturday by knocking a hole in a barrel of beer with the traditional cry of 「Ozapft is」 (It’s been tapped).
I assure you that I shall be here at midday tomorrow.
我向你保证明天中午我一定到这儿。
But it was in mid-week and at midday that Mr Taylor crawled home, with the dog but without the van, with a graze on his chin and his trousers torn, covered in mud and with a thumping headache.