What is the difference between 前と and 前に?


I've seen both used to mean "X ago", e.g. "六日前と" and "3ヶ月前に".




> What is the difference between 前と and 前に?  
>  I've seen both used to been "X ago", e.g. "六日前と" and "3ヶ月前に".

Those you've seen must be both correct, but に is the one to say 'X ago'.

と is used for a different reason such as 六日前と三か月前に, or 六日前と言っていました.

**に** indicates the location of something including **time** or owner of
things or ideas or values or etc.  
**と** **connects** nouns or noun-like words, or is used to describe something
by _indicating the **content** of a quotation or thought or idea,_ and the
form of the content doesn't matter whether it's a word or phrase or clause;
六日前 **と** いう話, 六日前の話 **と** いうことです, 「六日前に彼と会った」と言いました, etc.

