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1. in 1564, on 26th of April, in 1616.

2. at 9am, on Monday morning.

3. at night, in Summer.

4. at the moment, in an hour.

5. at midnight, at 10am, in the morning.

6. at weekends, at weekdays.

7. at Christmas, in Christmas day.

8. in the next century.

9. in December, at Christmas.

10. in the morning, in a cold rainy day.

11. on Tuesday, at nine o'clock in the morning.