Is there a Rust crate that implements the SQL date and interval types?

I went looking for a Rust crate (on lib.rs) that implements DateTime and found chrono.rs. However, I have two issues. 1. I cannot find a function that takes a string representing an SQL date and converts that into the external representation. I found a variety of conversion functions but they all require format strings specifying how the date is laid out in the string, but I don't know what the format specifier should be. The parser for SQL is simply handing me this date as a string and I don't know how the string is formatted. (The code I am parsing is one of the tpch queries, so it includes both a date and an interval, which I'm hoping can be converted to a "duration".) 2. The backend code which I am connecting to expects the date to be represented as a 64-bit unsigned integer. Is there a specific representation that is used for such? (Note, I asked on the Rust discord server, but only got the answer that the task should be "easy".)