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use std::time::SystemTime;
use util::HttpDate;

/// `Last-Modified` header, defined in
/// [RFC7232](http://tools.ietf.org/html/rfc7232#section-2.2)
///
/// The `Last-Modified` header field in a response provides a timestamp
/// indicating the date and time at which the origin server believes the
/// selected representation was last modified, as determined at the
/// conclusion of handling the request.
///
/// # ABNF
///
/// ```text
/// Expires = HTTP-date
/// ```
///
/// # Example values
///
/// * `Sat, 29 Oct 1994 19:43:31 GMT`
///
/// # Example
///
/// ```
/// # extern crate headers_ext as headers;
/// use headers::LastModified;
/// use std::time::{Duration, SystemTime};
///
/// let modified = LastModified::from(
///     SystemTime::now() - Duration::from_secs(60 * 60 * 24)
/// );
/// ```
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Header)]
pub struct LastModified(pub(super) HttpDate);

impl From<SystemTime> for LastModified {
    fn from(time: SystemTime) -> LastModified {
        LastModified(time.into())
    }
}

impl From<LastModified> for SystemTime {
    fn from(date: LastModified) -> SystemTime {
        date.0.into()
    }
}