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< Prepositions

Prepositions: Prepositions: Using "On" for Time

Dennis Oliver

Prepositions #2:
Using On for Time

The preposition on is often used in time phrases.
When on is used in this way, it is followed by noun
phrases that show a specific calendar time.

Examples:

I'll see you on Tuesday.

I'm not going to be here on February 23rd.

He went there on the 15th of January.

U.S. Independence Day is celebrated on July 4th.

The Winter Solstice is on December 21st.

She always has a party on her birthday.


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Special Notes:

1.

Do not use on with general clock or
calendar times:

wrong: *I'll see you on 10 o'clock
tomorrow morning.

wrong: *U.S. Independence Day is
on July.
2.

The fixed expression on time means
"at the scheduled time."

Examples:

The meeting was scheduled to begin
at 9:00 AM. It began at 9:00 AM.
The meeting began on time.

The plane was scheduled to leave at
12:10 PM. It left at 12:15, not at 12:10.
The plane didn't leave on time.
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