tzconvert/src/est2cet.rs

use structopt::StructOpt;
use chrono::prelude::*;

#[derive(StructOpt, Debug)]
#[structopt(author = env!("CARGO_PKG_AUTHORS"))]
struct Opt {
    /// time to convert
    #[structopt(value_name = "HH:MM")]
    time: String,

    /// specify the date on which the time lies. defaults to today.
    #[structopt(long, short)]
    date: Option<NaiveDate>,
}

fn main() {
    let Opt { time, date } = Opt::from_args();
    tzconvert::convert("EST", "Europe/Brussels",  &time, date);
}