twelve o'clock at night

He will stand at his desk folding and pasting and cutting until twelve o’clock at night.

From "All Quiet on the Western Front: A Novel" by Erich Maria Remarque

Dr. Whitman arrived at his station about twelve o’clock at night, attended upon the sick, and retired.

From A History of Oregon, 1792-1849 Drawn From Personal Observation and Authentic Information by William Henry Gray

Here they concealed themselves till towards twelve o'clock at night.

From Christmas Stories by Edward Berens

It is twelve o'clock at night; but I must just write you a word before I go to bed.

From Charlotte Bront? A Monograph by T. Wemyss Reid

Well, sir," he replied, "I hear cursing and swearing all day long, up till twelve o'clock at night, and you are the only man who speaks really good words.

From The Man with the Book or, The Bible Among the People. by John Matthias Weylland