A small Rust program to change timezone to JST. Uses tzutil.

changeTZ.rs

//A small program to change/revert timezone so I can play kancolle.
use std::fs;
use std::ffi::OsStr;
use std::process::Command;

fn main() {
    //if .tzdata exists
    if fs::read_dir(".").unwrap().any(|x|x.unwrap().file_name() == OsStr::new(".tzdata")) {
        let last_tz = fs::read_to_string(".tzdata").unwrap();
        let current_tz = Command::new("tzutil")
            .arg("/g")
            .output()
            .unwrap()
            .stdout;

        //if the original tz is different than the current (changed previously) then change back
        if last_tz != String::from_utf8_lossy(&current_tz) {
            //set the tz back
            let last_tz = last_tz.as_str();
            let res = Command::new("tzutil")
                .args(&["/s", last_tz])
                .output()
                .unwrap()
                .stdout;
            let res = String::from_utf8_lossy(&res);
            if res == "" {
                println!("Done reverting timezone.");
            } else {
                println!("Failed to revert timezone.");
            }
        } else {
            //switch to tokyo's
            let res = Command::new("tzutil")
            .args(&["/s", "Tokyo Standard Time"])
            .output()
            .unwrap()
            .stdout;

            let res = String::from_utf8_lossy(&res);
            if res == "" {
                println!("Done setting the timezone to Tokyo Standard Time.");
            } else {
                println!("Failed to set timezone.");
            }
        }
    } else {
        //run tzutil to get stuff and put it into a file
        let cmd_out = Command::new("tzutil")
            .arg("/g")
            .output()
            .unwrap()
            .stdout;

        fs::write(".tzdata", cmd_out).unwrap();

        //run a command to change tz
        Command::new("tzutil")
            .args(&["/s", "Tokyo Standard Time"])
            .spawn()
            .unwrap();

        //tell people about it
        println!("Done setting the timezone to Tokyo Standard Time.");
    }
}

I am still new to Rust, so if anyone have suggestions to improve this please say it out!