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Remove Tz::Offset: Display requirement from DateTime::to_rfc* #1160

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Jun 30, 2023
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Remove Tz::Offset: Display requirement from DateTime::to_rfc* #1160

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193 changes: 97 additions & 96 deletions src/datetime/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -488,6 +488,103 @@ impl<Tz: TimeZone> DateTime<Tz> {
}
}

/// Returns an RFC 2822 date and time string such as `Tue, 1 Jul 2003 10:52:37 +0200`.
///
/// # Panics
///
/// Panics if the date can not be represented in this format: the year may not be negative and
/// can not have more than 4 digits.
#[cfg(any(feature = "alloc", feature = "std"))]
#[cfg_attr(docsrs, doc(cfg(any(feature = "alloc", feature = "std"))))]
#[must_use]
pub fn to_rfc2822(&self) -> String {
let mut result = String::with_capacity(32);
crate::format::write_rfc2822(&mut result, self.naive_local(), self.offset.fix())
.expect("writing rfc2822 datetime to string should never fail");
result
}

/// Returns an RFC 3339 and ISO 8601 date and time string such as `1996-12-19T16:39:57-08:00`.
#[cfg(any(feature = "alloc", feature = "std"))]
#[cfg_attr(docsrs, doc(cfg(any(feature = "alloc", feature = "std"))))]
#[must_use]
pub fn to_rfc3339(&self) -> String {
let mut result = String::with_capacity(32);
crate::format::write_rfc3339(&mut result, self.naive_local(), self.offset.fix())
.expect("writing rfc3339 datetime to string should never fail");
result
}

/// Return an RFC 3339 and ISO 8601 date and time string with subseconds
/// formatted as per `SecondsFormat`.
///
/// If `use_z` is true and the timezone is UTC (offset 0), uses `Z` as
/// per [`Fixed::TimezoneOffsetColonZ`]. If `use_z` is false, uses
/// [`Fixed::TimezoneOffsetColon`]
///
/// # Examples
///
/// ```rust
/// # use chrono::{FixedOffset, SecondsFormat, TimeZone, Utc, NaiveDate};
/// let dt = NaiveDate::from_ymd_opt(2018, 1, 26).unwrap().and_hms_micro_opt(18, 30, 9, 453_829).unwrap().and_local_timezone(Utc).unwrap();
/// assert_eq!(dt.to_rfc3339_opts(SecondsFormat::Millis, false),
/// "2018-01-26T18:30:09.453+00:00");
/// assert_eq!(dt.to_rfc3339_opts(SecondsFormat::Millis, true),
/// "2018-01-26T18:30:09.453Z");
/// assert_eq!(dt.to_rfc3339_opts(SecondsFormat::Secs, true),
/// "2018-01-26T18:30:09Z");
///
/// let pst = FixedOffset::east_opt(8 * 60 * 60).unwrap();
/// let dt = pst.from_local_datetime(&NaiveDate::from_ymd_opt(2018, 1, 26).unwrap().and_hms_micro_opt(10, 30, 9, 453_829).unwrap()).unwrap();
/// assert_eq!(dt.to_rfc3339_opts(SecondsFormat::Secs, true),
/// "2018-01-26T10:30:09+08:00");
/// ```
#[cfg(any(feature = "alloc", feature = "std"))]
#[cfg_attr(docsrs, doc(cfg(any(feature = "alloc", feature = "std"))))]
#[must_use]
pub fn to_rfc3339_opts(&self, secform: SecondsFormat, use_z: bool) -> String {
use crate::format::Numeric::*;
use crate::format::Pad::Zero;
use crate::SecondsFormat::*;

debug_assert!(secform != __NonExhaustive, "Do not use __NonExhaustive!");

const PREFIX: &[Item<'static>] = &[
Item::Numeric(Year, Zero),
Item::Literal("-"),
Item::Numeric(Month, Zero),
Item::Literal("-"),
Item::Numeric(Day, Zero),
Item::Literal("T"),
Item::Numeric(Hour, Zero),
Item::Literal(":"),
Item::Numeric(Minute, Zero),
Item::Literal(":"),
Item::Numeric(Second, Zero),
];

let ssitem = match secform {
Secs => None,
Millis => Some(Item::Fixed(Fixed::Nanosecond3)),
Micros => Some(Item::Fixed(Fixed::Nanosecond6)),
Nanos => Some(Item::Fixed(Fixed::Nanosecond9)),
AutoSi => Some(Item::Fixed(Fixed::Nanosecond)),
__NonExhaustive => unreachable!(),
};

let tzitem = Item::Fixed(if use_z {
Fixed::TimezoneOffsetColonZ
} else {
Fixed::TimezoneOffsetColon
});

let dt = self.fixed_offset();
match ssitem {
None => dt.format_with_items(PREFIX.iter().chain([tzitem].iter())).to_string(),
Some(s) => dt.format_with_items(PREFIX.iter().chain([s, tzitem].iter())).to_string(),
}
}

/// The minimum possible `DateTime<Utc>`.
pub const MIN_UTC: DateTime<Utc> = DateTime { datetime: NaiveDateTime::MIN, offset: Utc };
/// The maximum possible `DateTime<Utc>`.
Expand Down Expand Up @@ -701,102 +798,6 @@ impl<Tz: TimeZone> DateTime<Tz>
where
Tz::Offset: fmt::Display,
{
/// Returns an RFC 2822 date and time string such as `Tue, 1 Jul 2003 10:52:37 +0200`.
///
/// # Panics
///
/// Panics if the date can not be represented in this format: the year may not be negative and
/// can not have more than 4 digits.
#[cfg(any(feature = "alloc", feature = "std"))]
#[cfg_attr(docsrs, doc(cfg(any(feature = "alloc", feature = "std"))))]
#[must_use]
pub fn to_rfc2822(&self) -> String {
let mut result = String::with_capacity(32);
crate::format::write_rfc2822(&mut result, self.naive_local(), self.offset.fix())
.expect("writing rfc2822 datetime to string should never fail");
result
}

/// Returns an RFC 3339 and ISO 8601 date and time string such as `1996-12-19T16:39:57-08:00`.
#[cfg(any(feature = "alloc", feature = "std"))]
#[cfg_attr(docsrs, doc(cfg(any(feature = "alloc", feature = "std"))))]
#[must_use]
pub fn to_rfc3339(&self) -> String {
let mut result = String::with_capacity(32);
crate::format::write_rfc3339(&mut result, self.naive_local(), self.offset.fix())
.expect("writing rfc3339 datetime to string should never fail");
result
}

/// Return an RFC 3339 and ISO 8601 date and time string with subseconds
/// formatted as per `SecondsFormat`.
///
/// If `use_z` is true and the timezone is UTC (offset 0), uses `Z` as
/// per [`Fixed::TimezoneOffsetColonZ`]. If `use_z` is false, uses
/// [`Fixed::TimezoneOffsetColon`]
///
/// # Examples
///
/// ```rust
/// # use chrono::{FixedOffset, SecondsFormat, TimeZone, Utc, NaiveDate};
/// let dt = NaiveDate::from_ymd_opt(2018, 1, 26).unwrap().and_hms_micro_opt(18, 30, 9, 453_829).unwrap().and_local_timezone(Utc).unwrap();
/// assert_eq!(dt.to_rfc3339_opts(SecondsFormat::Millis, false),
/// "2018-01-26T18:30:09.453+00:00");
/// assert_eq!(dt.to_rfc3339_opts(SecondsFormat::Millis, true),
/// "2018-01-26T18:30:09.453Z");
/// assert_eq!(dt.to_rfc3339_opts(SecondsFormat::Secs, true),
/// "2018-01-26T18:30:09Z");
///
/// let pst = FixedOffset::east_opt(8 * 60 * 60).unwrap();
/// let dt = pst.from_local_datetime(&NaiveDate::from_ymd_opt(2018, 1, 26).unwrap().and_hms_micro_opt(10, 30, 9, 453_829).unwrap()).unwrap();
/// assert_eq!(dt.to_rfc3339_opts(SecondsFormat::Secs, true),
/// "2018-01-26T10:30:09+08:00");
/// ```
#[cfg(any(feature = "alloc", feature = "std"))]
#[cfg_attr(docsrs, doc(cfg(any(feature = "alloc", feature = "std"))))]
#[must_use]
pub fn to_rfc3339_opts(&self, secform: SecondsFormat, use_z: bool) -> String {
use crate::format::Numeric::*;
use crate::format::Pad::Zero;
use crate::SecondsFormat::*;

debug_assert!(secform != __NonExhaustive, "Do not use __NonExhaustive!");

const PREFIX: &[Item<'static>] = &[
Item::Numeric(Year, Zero),
Item::Literal("-"),
Item::Numeric(Month, Zero),
Item::Literal("-"),
Item::Numeric(Day, Zero),
Item::Literal("T"),
Item::Numeric(Hour, Zero),
Item::Literal(":"),
Item::Numeric(Minute, Zero),
Item::Literal(":"),
Item::Numeric(Second, Zero),
];

let ssitem = match secform {
Secs => None,
Millis => Some(Item::Fixed(Fixed::Nanosecond3)),
Micros => Some(Item::Fixed(Fixed::Nanosecond6)),
Nanos => Some(Item::Fixed(Fixed::Nanosecond9)),
AutoSi => Some(Item::Fixed(Fixed::Nanosecond)),
__NonExhaustive => unreachable!(),
};

let tzitem = Item::Fixed(if use_z {
Fixed::TimezoneOffsetColonZ
} else {
Fixed::TimezoneOffsetColon
});

match ssitem {
None => self.format_with_items(PREFIX.iter().chain([tzitem].iter())).to_string(),
Some(s) => self.format_with_items(PREFIX.iter().chain([s, tzitem].iter())).to_string(),
}
}

/// Formats the combined date and time with the specified formatting items.
#[cfg(any(feature = "alloc", feature = "std"))]
#[cfg_attr(docsrs, doc(cfg(any(feature = "alloc", feature = "std"))))]
Expand Down