find the last modified date of a json file in rust

To find the last modified date of a JSON file in Rust, we need to use the std::fs::metadata function to get the metadata for the file, which includes the last modified date.

Here is an example code snippet that demonstrates how to do this:

main.rs
use std::fs;

fn main() -> std::io::Result<()> {
    let file_path = "data.json";
    let metadata = fs::metadata(file_path)?;
    let modified = metadata.modified()?;
    println!("Last modified: {:?}", modified);
    Ok(())
}
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In this example, we first define the path to the JSON file as file_path. We then use fs::metadata to get the metadata for the file. This returns a std::fs::Metadata struct, which contains information about the file, including its last modified timestamp.

We then extract the last modified timestamp from the metadata using the modified function, which returns a std::io::Result<SystemTime> struct. Finally, we print out the last modified timestamp using println!.

Note that the ? operator is used throughout this code to handle potential errors when accessing the file metadata.