The sibling thread of my comment seems to imply this is proper grammar. And, English not being my mother tongue, I won't disagree. (and I'll be happy to be corr

The sibling thread of my comment seems to imply this is proper grammar. And, English not being my mother tongue, I won't disagree. (and I'll be happy to be corrected) However, it doesn't sound quite proper to me and I haven't heard it before. Instead I use and hear/read "Let me know what time/day works for you".