檳榔嶼

For years, months, seasons, centuries and times of day, use the preposition in:
 - I first met John  in  1987.
 - It's always cold  in  January
 - Easter falls  in  spring each year.
 - The Second World War occurred  in  the 20th century.
 - We eat breakfast  in  the morning.
For days, dates and specific holiday days, use the preposition on.
 - We go to school  on  Mondays, but not  on  Sunday
 - Christmas is  on  December 25th.
 - Buy me a present  on  my birthday.
For times, indicators of exception and festivals, use the preposition at:
 - Families often argue  at  Christmas time.
 - I work faster  at  night.
 - Her shift finished  at  7pm.
Before  and  after  should be much easier to understand than the other examples of prepositions of time. Both are used to explain when something happened, happens or will happen, but specifically in relation to another thing.
 - Before  I discovered this bar, I used to go straight home  after  work.
 - We will not leave  before  3pm.
 - David comes  before  Bryan in the line, but  after  Louise.
Other prepositions of time could include: During, about, around, until and throughout.
 - The concert will be staged  throughout  the month of May.
 - I learned how to ski  during  the holidays.
 - He usually arrives  around  3pm.
 - It was  about  six in the morning when we made it to bed.
 - The store is open  until  midnight.