You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: date.rs
    path of file: ./repos/lettre/src/message/header
    
    the code of the file until where you have to start completion: use std::time::SystemTime;

use httpdate::HttpDate;

use super::{Header, HeaderName, HeaderValue};
use crate::BoxError;

/// Message `Date` header
///
/// Defined in [RFC2822](https://tools.ietf.org/html/rfc2822#section-3.3)
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct Date(HttpDate);

impl Date {
    /// Build a `Date` from [`SystemTime`]
    pub fn new(st: SystemTime) -> Self {
        Sel
    
    fn parse_date() {
        let mut headers = Headers::new();

        headers.insert_raw(HeaderValue::new(
            HeaderName::new_from_ascii_str("Date"),
            "Tue, 15 Nov 1994 08:12:31 +0000".to_owned(),
        ));

        assert_eq!(
            headers.get::<Date>(),
            Some(Date::from(
                SystemTime::UNIX_EPOCH + Duration::from_secs(784887151),
            ))
        );

        headers.insert_raw(HeaderValue::new(
            HeaderName::new_from_ascii_str("Date"),
            "Tue, 15 Nov 1994 08:12:32 +0000".to_owned(),
        ));

        assert_eq!(
            headers.get::<Date>(),
            Some(Date::from(
                SystemTime::UNIX_EPOCH + Duration::from_secs(784887152),
            ))
        );
    }