5.93 'in' for periods of time

If you want to mention the period of time in which something happens, you use 'in' with centuries, years, seasons, months, and the periods of the day 'morning' 'afternoon' and 'evening'. You also use 'in' with 'daytime' and 'night-time'.

• In the sixteenth century there were three tennis courts.
• It's true that we expected a great deal in the sixties.
• Americans visiting Sweden in the early 1950's were astounded by its cleanliness.
• If you were to go on holiday on the continent in wintertime what sport could you take part in?
• To be in Cornwall at any time is a pleasure, to be here in summer is a bonus.
• I get strange feelings in the autumn.
• She will preside over the annual meeting of the Court in December.
• In September I travelled to California to see the finished film.
• I'll ring the agent in the morning.
• Well, she does come in to clean the rooms in the day-time.

Note that if 'morning', 'afternoon', and 'evening' are used with a modifier or a qualifier, you use 'on'. See paragraph 5.95 for details.