Function unix_timestamp 

pub fn unix_timestamp(ntp_server: &str) -> Result<Duration, NtpError>

Retrieve current unix timestamp.

Example

fn main() {
    match unix_timestamp("ntp.aliyun.com:123") {
        Ok(msg) => {
            println!("{:?}", msg);
        }
        Err(err) => println!("{:?}", err)
    }
}