Preposition of time

• AT

at times: at 8pm at 11.30am at night at Christmas
at the weekend at lunchtime at dinnertime at breakfast

• ON

on days: on Monday on your birthday on New Year's Eve
on days + morning/afternoon/evening/night: on Sunday

 morning
on dates: on the 14th July on the 29th November

• IN

in years in 2011 in 1921 in 1452
in months in December in June in October
in decades in the forties in the thirties in the seventies
in seasons in winter in summer in autumn in spring
in the morning in the afternoon in the evening
but at night

There are no prepositions in these terms:

• next week; next year, next month etc
• last night; last year, last month etc
• this morning; this month; this week etc
• every day; every night; every year etc
• today; tomorrow; yesterday