use time::{Date, Time};

	use time::{Date, Time};

    DateTime::new(
        Date::from_calendar_date(year, month.try_into().unwrap(), day).unwrap(),
        Time::from_hms(hour, minute, second).unwrap(),
    )

	DateTime::new(
		Date::from_calendar_date(year, month.try_into().unwrap(), day).unwrap(),
		Time::from_hms(hour, minute, second).unwrap(),
	)

    let start_date = dt(2011, 4, 25, 0, 0, 0);

	let start_date = dt(2011, 4, 25, 0, 0, 0);

    assert_eq!(gigasecond::after(start_date), dt(2043, 1, 1, 1, 46, 40));

	assert_eq!(gigasecond::after(start_date), dt(2043, 1, 1, 1, 46, 40));

    let start_date = dt(1977, 6, 13, 0, 0, 0);

	let start_date = dt(1977, 6, 13, 0, 0, 0);

    assert_eq!(gigasecond::after(start_date), dt(2009, 2, 19, 1, 46, 40));

	assert_eq!(gigasecond::after(start_date), dt(2009, 2, 19, 1, 46, 40));

    let start_date = dt(1959, 7, 19, 0, 0, 0);

	let start_date = dt(1959, 7, 19, 0, 0, 0);

    assert_eq!(gigasecond::after(start_date), dt(1991, 3, 27, 1, 46, 40));

	assert_eq!(gigasecond::after(start_date), dt(1991, 3, 27, 1, 46, 40));

    let start_date = dt(2015, 1, 24, 22, 0, 0);

	let start_date = dt(2015, 1, 24, 22, 0, 0);

    assert_eq!(gigasecond::after(start_date), dt(2046, 10, 2, 23, 46, 40));

	assert_eq!(gigasecond::after(start_date), dt(2046, 10, 2, 23, 46, 40));

    let start_date = dt(2015, 1, 24, 23, 59, 59);

	let start_date = dt(2015, 1, 24, 23, 59, 59);

    assert_eq!(gigasecond::after(start_date), dt(2046, 10, 3, 1, 46, 39));

	assert_eq!(gigasecond::after(start_date), dt(2046, 10, 3, 1, 46, 39));

use time::PrimitiveDateTime as DateTime;

use time::{Duration, PrimitiveDateTime as DateTime};

    unimplemented!("What time is a gigasecond later than {}", start);

	start + Duration::seconds(10_i64.pow(9))