irection::Sign`] via [`SpanPrinter::direction`] |
| `+2d 3h` | [`Direction::ForceSign`] via [`SpanPrinter::direction`] |
| `2d 3h ago` | [`Direction::Suffix`] via [`SpanPrinter::direction`] |
| `9.123456789s` | [`FractionalUnit::Second`] via [`SpanPrinter::fractional`] |
| `1y, 2mo` | [`SpanPrinter::comma_after_designator`] |
| `15d 02:59:15.123` | [`SpanPrinter::hours_minutes_seconds`] |

## Bespoke datetime formats via `strptime` and `strftime`

Every datetime type has bespoke formatting routines defined on it. For
example, [`Zoned::strptime`] and [`civil::Date::strftime`]. Additionally, the
[`strtime`] sub-module also provides convenience routines, [`strtime::format`]
and [`strtime::parse`], where the former is generic over any datetime type in
Jiff and the latter provides a [`BrokenDownTime`] for granular parsing.

| Example | Format string |
| ------- | ------------- |
| `2025-05-20` | `%Y-%m-%d` |
| `2025-05-20` | `%F` |
| `2025-W21-2` | `%G-W%V-%u` |
| `05/20/25` | `%m/%d/%y` |
| `Monday, February 10, 2025 at 9:01pm -0500` | `%A, %B %d, %Y at %-I:%M%P %z` |
| `Monday, February 10, 2025 at 9:01pm EST` | `%A, %B %d, %Y at %-I:%M%P %Z` |
| `Monday, February 10, 2025 at 9:01pm America/New_York` | `%A, %B %d, %Y at %-I:%M%P %Q` |

The specific conversion specifiers supported are documented in the [`strtime`]
sub-module. While precise POSIX compatibility is not guaranteed, the conversion
specifiers are generally meant to match prevailing implementations. (Although
there are many such implementations and they each tend to have their own quirks
and features.)

## RFC 2822 parsing and printing

[RFC-2822] support is provided by the [`rfc2822`] sub-module.

| Example | Links |
| ------- | ----- |
| `Thu, 29 Feb 2024 05:34 -0500` | [`rfc2822::parse`] and [`rfc2822::to_string`] |
| `Thu, 01 Jan 1970 00:00:01 GMT` | [`DateTimePrinter::timestamp_to_rfc9110_string`] |

[Temporal]: https://tc39.es/proposal-temporal/#sec-temporal-iso8601grammar
[ISO-8601]: https://www.iso.org/iso-8601-date-and-time-format.html
[RFC-3339]: https://www.rfc-editor.org/rfc/rfc3339
[RFC-9557]: https://www.rfc-editor.org/rfc/rfc9557.html
[ISO-8601]: https://www.iso.org/iso-8601-date-and-time-format.html
[RFC-2822]: https://datatracker.ietf.org/doc/html/rfc2822
[RFC-9110]: https://datatracker.ietf.org/doc/html/rfc9110#section-5.6.7-15
[`Display`]: std::fmt::Display
[`FromStr`]: std::str::FromStr
[`friendly`]: crate::fmt::friendly
[`temporal`]: crate::fmt::temporal
[`rfc2822`]: crate::fmt::rfc2822
[`strtime`]: crate::fmt::strtime
[`civil::DateTime`]: crate::civil::DateTime
[`civil::Date`]: crate::civil::Date
[`civil::Date::strftime`]: crate::civil::Date::strftime
[`civil::Time`]: crate::civil::Time
[`SignedDuration`]: crate::SignedDuration
[`Span`]: crate::Span
[`Timestamp`]: crate::Timestamp
[`Timestamp::display_with_offset`]: crate::Timestamp::display_with_offset
[`Zoned`]: crate::Zoned
[`Zoned::strptime`]: crate::Zoned::strptime

[`Designator::Verbose`]: crate::fmt::friendly::Designator::Verbose
[`Designator::Short`]: crate::fmt::friendly::Designator::Short
[`Designator::Compact`]: crate::fmt::friendly::Designator::Compact
[`Spacing::None`]: crate::fmt::friendly::Spacing::None
[`Spacing::BetweenUnits`]: crate::fmt::friendly::Spacing::BetweenUnits
[`Spacing::BetweenUnitsAndDesignators`]: crate::fmt::friendly::Spacing::BetweenUnitsAndDesignators
[`Direction::Auto`]: crate::fmt::friendly::Direction::Auto
[`Direction::Sign`]: crate::fmt::friendly::Direction::Sign
[`Direction::ForceSign`]: crate::fmt::friendly::Direction::ForceSign
[`Direction::Suffix`]: crate::fmt::friendly::Direction::Suffix
[`FractionalUnit::Second`]: crate::fmt::friendly::FractionalUnit::Second
[`SpanPrinter::designator`]: crate::fmt::friendly::SpanPrinter::designator
[`SpanPrinter::spacing`]: crate::fmt::friendly::SpanPrinter::spacing
[`SpanPrinter::direction`]: crate::fmt::friendly::SpanPrinter::direction
[`SpanPrinter::fractional`]: crate::fmt::friendly::SpanPrinter::fractional
[`SpanPrinter::comma_after_designator`]: crate::fmt::friendly::SpanPrinter::comma_after_designator
[`SpanPrinter::hours_minutes_seconds`]: crate::fmt::friendly::SpanPrinter::hours_minutes_seconds

[`BrokenDownTime`]: crate::fmt::strtime::BrokenDownTime
[`strtime::parse`]: crate::fmt::strtime::parse
[`strtime::format`]: crate::fmt::strtime::format

[`rfc2822::parse`]: crate::fmt::rfc2822::parse
[`rfc2822::to_string`]: crate::fmt::rfc2822::to_string
[`DateTimePrinter::timestamp_to_rfc9110_string`]: crate::fmt::rfc2822::DateTimePrinter::timestamp_to_rfc9110_string