Prepositions with time: The preposition ON

[richard]

English Language Tests, Intermediate level

ESL/EFL Test #205 "Prepositions of Time and Date (3)", question 5

My vacation starts ......... July 3. Wendy will fill in for me while I'm gone.

(a) on
(b) at
(c) in

English Language Tests, Intermediate level

ESL/EFL Test #205 "Prepositions of Time and Date (3)", answer 5

My vacation starts on July 3. Wendy will fill in for me while I'm gone.

Correct answer: (a) on

Your answer was: incorrect
My vacation starts at July 3. Wendy will fill in for me while I'm gone.
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i dont think so at will turn up as answer for this question

richard

[Pamela]

The preposition "on" is used to indicate specific times. For example: on Monday 22nd and so on. Moreover there is a general rule of usage for the following prepositions:
At: a time: at 5, at night
On: a day: on Monday, on July 22nd
In: a month, year, etc: in April, in 1983, in the 21st century.

Hope, it's clear.