1) At 7 oclock.
... at seven oclock in the morning
2)At 10 oclock.
...at ten oclock in the morning
3) At 12 oclock
...at twelve oclock
4)At 1 oclock
...at one oclock in the evening
5)At 2 oclock
... at two oclock in the evening
6) At 8 oclock
...at eight oclock in the evening
7) At 11 oclock
...at eleventh oclock in the evening.
P.M. - это если вечер
A.M. - это если утро