Student or Learner
I think I know the rules about prepositions of time, but could someone help me find out the rule about the phrase ' at night'?
For example, should I say 'I went to the cinema at Saturday night 'o r 'I went to the cinema Saturday night'?
Thank you very much,
'I went to the cinema on Saturday night' or (informally) 'I went to the cinema Saturday night'.