--- /dev/null
+use crate::error::{Error, Result};
+use crate::iter::Iter;
+use crate::{time, token};
+use proc_macro::Group;
+use std::fmt::{self, Display};
+
+#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Date {
+ pub year: u16,
+ pub month: u8,
+ pub day: u8,
+}
+
+impl Display for Date {
+ fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+ write!(
+ formatter,
+ "{:04}-{:02}-{:02}",
+ self.year, self.month, self.day,
+ )
+ }
+}
+
+pub fn parse(paren: Group, iter: Iter) -> Result<Date> {
+ try_parse(iter).map_err(|_| {
+ let msg = format!("expected nightly date, like {}", time::today());
+ Error::group(paren, msg)
+ })
+}
+
+fn try_parse(iter: Iter) -> Result<Date, ()> {
+ let year = token::parse_literal(iter).map_err(drop)?;
+ token::parse_punct(iter, '-').map_err(drop)?;
+ let month = token::parse_literal(iter).map_err(drop)?;
+ token::parse_punct(iter, '-').map_err(drop)?;
+ let day = token::parse_literal(iter).map_err(drop)?;
+
+ let year = year.to_string().parse::<u64>().map_err(drop)?;
+ let month = month.to_string().parse::<u64>().map_err(drop)?;
+ let day = day.to_string().parse::<u64>().map_err(drop)?;
+ if year >= 3000 || month > 12 || day > 31 {
+ return Err(());
+ }
+
+ Ok(Date {
+ year: year as u16,
+ month: month as u8,
+ day: day as u8,
+ })
+}