I'll never forget the day that/which I met you on.

[z7655431]

a. I'll never forget the day when I met you.
b. I'll never forget the day on which I met you.
c. I'll never forget the day that I met you.
d. I'll never forget the day I met you.
Sentences a, b, c, and d are listed in my grammar book (AZAR). Apparently, they are correct.

But I wonder whether the sentences below are correct or not. And are they common compared to sentences a to d?
e. I'll never forget the day which I met you on.
f. I'll never forget the day that I met you on.

Thanks!

 

[emsr2d2]

A, B, C and D are all grammatically correct. The most natural in BrE is certainly D.

E and F are OK though E sounds awkward.

 

[Charlie Bernstein]

Yes. D is perfect-pitch British and American English. The others are not.

"Which" would not be used in the US, and "on" is very awkward, if not downright ungrammatical.

 

[emsr2d2]

I don't tend to use "on" in those constructions but I don't find it ungrammatical.

I met you on Tuesday = Tuesday is the day I met you on = Tuesday is the day I met you.