Preposition of places, dates and times
At, On and In
Before place names:
“In” is used before the names of
countries, states, towns, cities, and roads.
Thus, you can say
“I live in Australia / in Kedah / in Petaling Jaya
/ in Dungun / in Jalan Indah.”
“On” is used before the names
of islands and hills.
“She lives on Pulau Langkawi / on the Isle of Man,
on Penang Hill / on Lavender Hill.”
“At” is used for smaller places,
like buildings, blocks of flats, etc.
“I live at Indah Flats and
I work at the Petronas Twin Towers.”
Before dates and times:
“In” is used before months and years,
“on” is used before a day or a particular date in a month, and
“at” is used before a particular time.
For example, you can say:
“I was born on the 3rd of August 1967, at 8.45 am.”
OR “I was born on Monday.”
OR “I was born in August.”
OR “I was born in 1967.”