Prepositions of Time:

(вживання прийменників часу)

in

- parts of day: in the morning, in the afternoon, in the evening
- months: in January, in February, in March, in April, in May, in June, in July, in August, in September, in October, in November, in December
- seasons: in autumn, in winter, in spring, in summer
- years: in 1987, in 2017, in 988

but at night, at noon, at midnight

on

- days of the week: on Sunday, on Monday, on Tuesday, on Wednesday, on Thursday, on Fridy, on Saturday
- dates: on the 21st of September, on May 9th
- events: on Christmas Day, on Easter Day

at

- time: at 5 o'clock, at 8 p.m., at 6:15, at 10 a.m.
- holidays: at Christmas, at Easter