Hi, are these two cases of using the preposition ‘of’ too exotic or they are real? I found them in the Longman dictionary.
The first one.
22 American English spoken used in giving the time, to mean 'before' synonym 'to' British English
It's a quarter OF seven (=6.45). Instead of It’s a quarter TO seven.
The second one
25 of an evening/of a weekend etc British English in the evenings, at weekends etc:
We often used to walk by the river OF an evening.
We often used to walk by the river in the evenings.