Time and date: at, on, by, before, in A at, on

at a time:

at dawn at six at midnight at 4.30

at an age:

at sixteen/at the age of sixteen She got married at seventeen.

on a day/date:,

on Monday on 4 June on Christmas Day

Exceptions at night at Christmas, at Easter (the period, not the day only) on the morning/afternoon/evening/night of a certain date:

We arrived on the morning of the sixth. It is also, of course, possible to say:

this/next Monday etc., any Monday, one Monday

B by, before

by a time/date/period = at that time or before/not later than that date. It often implies 'before that time/date': The train starts at 6.10, so you had better be at the station by 6.00. by + a time expression is often used with a perfect tense, particularly the future perfect (see 216):

By the end of July I'll have read all those books. before can be preposition, conjunction or adverb:

Before signing this... (preposition)

Before you sign this... (conjunction)

I've seen him somewhere before, (adverb) (See 195 B, 342.)

C on time, in time, in good time

on time = at the time arranged, not before, not after:

The 8.15 train started on time. (It started at 8.15.) in time/in time for + noun = not late; in good time (for) =

with a comfortable margin:

Passengers should be in time for their train.

I arrived at the concert hall in good time (for the concert). (Perhaps

the concert began at 7.30 and I arrived at 7.15.)

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