Struct UtcOffset

pub struct UtcOffset {
    hours: RangedI8<-25, 25>,
    minutes: RangedI8<{ _ }, { _ }>,
    seconds: RangedI8<{ _ }, { _ }>,
}

An offset from UTC.

This struct can store values up to ±25:59:59. If you need support outside this range, please file an issue with your use case.

Fields

hours: RangedI8<-25, 25>

minutes: RangedI8<{ _ }, { _ }>

seconds: RangedI8<{ _ }, { _ }>

Implementations

impl UtcOffset

pub const UTC: Self = _

A UtcOffset that is UTC.

assert_eq!(UtcOffset::UTC, offset!(UTC));

#[doc(hidden)] pub const unsafe fn __from_hms_unchecked( hours: i8, minutes: i8, seconds: i8, ) -> Self

Create a UtcOffset representing an offset of the hours, minutes, and seconds provided, the validity of which must be guaranteed by the caller. All three parameters must have the same sign.

Safety

• Hours must be in the range -25..=25.
• Minutes must be in the range -59..=59.
• Seconds must be in the range -59..=59.

While the signs of the parameters are required to match to avoid bugs, this is not a safety invariant.

pub const fn from_hms( hours: i8, minutes: i8, seconds: i8, ) -> Result<Self, ComponentRange>

Create a UtcOffset representing an offset by the number of hours, minutes, and seconds provided.

The sign of all three components should match. If they do not, all smaller components will have their signs flipped.

assert_eq!(UtcOffset::from_hms(1, 2, 3)?.as_hms(), (1, 2, 3));
assert_eq!(UtcOffset::from_hms(1, -2, -3)?.as_hms(), (1, 2, 3));

pub(crate) const fn from_hms_ranged_unchecked( hours: RangedI8<-25, 25>, minutes: RangedI8<{ _ }, { _ }>, seconds: RangedI8<{ _ }, { _ }>, ) -> Self

Create a UtcOffset representing an offset of the hours, minutes, and seconds provided. All three parameters must have the same sign.

While the signs of the parameters are required to match, this is not a safety invariant.

pub(crate) const fn from_hms_ranged( hours: RangedI8<-25, 25>, minutes: RangedI8<{ _ }, { _ }>, seconds: RangedI8<{ _ }, { _ }>, ) -> Self

Create a UtcOffset representing an offset by the number of hours, minutes, and seconds provided.

The sign of all three components should match. If they do not, all smaller components will have their signs flipped.

pub const fn from_whole_seconds(seconds: i32) -> Result<Self, ComponentRange>

Create a UtcOffset representing an offset by the number of seconds provided.

assert_eq!(UtcOffset::from_whole_seconds(3_723)?.as_hms(), (1, 2, 3));

pub(crate) const fn from_whole_seconds_ranged( seconds: RangedI32<{ _ }, { _ }>, ) -> Self

Create a UtcOffset representing an offset by the number of seconds provided.

assert_eq!(
    UtcOffset::from_whole_seconds_ranged(RangedI32::new_static::<3_723>()).as_hms(),
    (1, 2, 3)
);

pub const fn as_hms(self) -> (i8, i8, i8)

Obtain the UTC offset as its hours, minutes, and seconds. The sign of all three components will always match. A positive value indicates an offset to the east; a negative to the west.

assert_eq!(offset!(+1:02:03).as_hms(), (1, 2, 3));
assert_eq!(offset!(-1:02:03).as_hms(), (-1, -2, -3));

pub(crate) const fn as_hms_ranged( self, ) -> (RangedI8<-25, 25>, RangedI8<{ _ }, { _ }>, RangedI8<{ _ }, { _ }>)

Available on crate feature quickcheck only.

Obtain the UTC offset as its hours, minutes, and seconds. The sign of all three components will always match. A positive value indicates an offset to the east; a negative to the west.

pub const fn whole_hours(self) -> i8

Obtain the number of whole hours the offset is from UTC. A positive value indicates an offset to the east; a negative to the west.

assert_eq!(offset!(+1:02:03).whole_hours(), 1);
assert_eq!(offset!(-1:02:03).whole_hours(), -1);

pub const fn whole_minutes(self) -> i16

Obtain the number of whole minutes the offset is from UTC. A positive value indicates an offset to the east; a negative to the west.

assert_eq!(offset!(+1:02:03).whole_minutes(), 62);
assert_eq!(offset!(-1:02:03).whole_minutes(), -62);

pub const fn minutes_past_hour(self) -> i8

Obtain the number of minutes past the hour the offset is from UTC. A positive value indicates an offset to the east; a negative to the west.

assert_eq!(offset!(+1:02:03).minutes_past_hour(), 2);
assert_eq!(offset!(-1:02:03).minutes_past_hour(), -2);

pub const fn whole_seconds(self) -> i32

Obtain the number of whole seconds the offset is from UTC. A positive value indicates an offset to the east; a negative to the west.

assert_eq!(offset!(+1:02:03).whole_seconds(), 3723);
assert_eq!(offset!(-1:02:03).whole_seconds(), -3723);

pub const fn seconds_past_minute(self) -> i8

Obtain the number of seconds past the minute the offset is from UTC. A positive value indicates an offset to the east; a negative to the west.

assert_eq!(offset!(+1:02:03).seconds_past_minute(), 3);
assert_eq!(offset!(-1:02:03).seconds_past_minute(), -3);

pub const fn is_utc(self) -> bool

Check if the offset is exactly UTC.

assert!(!offset!(+1:02:03).is_utc());
assert!(!offset!(-1:02:03).is_utc());
assert!(offset!(UTC).is_utc());

pub const fn is_positive(self) -> bool

Check if the offset is positive, or east of UTC.

assert!(offset!(+1:02:03).is_positive());
assert!(!offset!(-1:02:03).is_positive());
assert!(!offset!(UTC).is_positive());

pub const fn is_negative(self) -> bool

Check if the offset is negative, or west of UTC.

assert!(!offset!(+1:02:03).is_negative());
assert!(offset!(-1:02:03).is_negative());
assert!(!offset!(UTC).is_negative());

pub fn local_offset_at( datetime: OffsetDateTime, ) -> Result<Self, IndeterminateOffset>

Available on crate feature local-offset only.

Attempt to obtain the system’s UTC offset at a known moment in time. If the offset cannot be determined, an error is returned.

let local_offset = UtcOffset::local_offset_at(OffsetDateTime::UNIX_EPOCH);
assert!(local_offset.is_ok());

pub fn current_local_offset() -> Result<Self, IndeterminateOffset>

Available on crate feature local-offset only.

Attempt to obtain the system’s current UTC offset. If the offset cannot be determined, an error is returned.

let local_offset = UtcOffset::current_local_offset();
assert!(local_offset.is_ok());

impl UtcOffset

pub fn format_into( self, output: &mut impl Write, format: &(impl Formattable + ?Sized), ) -> Result<usize, Format>

Available on crate feature formatting only.

Format the UtcOffset using the provided format description.

pub fn format( self, format: &(impl Formattable + ?Sized), ) -> Result<String, Format>

Available on crate feature formatting only.

Format the UtcOffset using the provided format description.

let format = format_description::parse("[offset_hour sign:mandatory]:[offset_minute]")?;
assert_eq!(offset!(+1).format(&format)?, "+01:00");

impl UtcOffset

pub fn parse( input: &str, description: &(impl Parsable + ?Sized), ) -> Result<Self, Parse>

Available on crate feature parsing only.

Parse a UtcOffset from the input using the provided format description.

let format = format_description!("[offset_hour]:[offset_minute]");
assert_eq!(UtcOffset::parse("-03:42", &format)?, offset!(-3:42));

Trait Implementations

impl Arbitrary for UtcOffset

Available on crate feature quickcheck only.

fn arbitrary(g: &mut Gen) -> Self

Return an arbitrary value.

fn shrink(&self) -> Box<dyn Iterator<Item = Self>>

Return an iterator of values that are smaller than itself.

impl Clone for UtcOffset

fn clone(&self) -> UtcOffset

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for UtcOffset

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a> Deserialize<'a> for UtcOffset

Available on crate feature serde only.

fn deserialize<D: Deserializer<'a>>(deserializer: D) -> Result<Self, D::Error>

Deserialize this value from the given Serde deserializer.

#[doc(hidden)] fn deserialize_in_place<D>( deserializer: D, place: &mut Self, ) -> Result<(), <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

Deserializes a value into self from the given Deserializer.

impl Display for UtcOffset

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Distribution<UtcOffset> for Standard

Available on crate feature rand only.

fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> UtcOffset

Generate a random value of T, using rng as the source of randomness.

fn sample_iter<R>(self, rng: R) -> DistIter<Self, R, T>

where R: Rng, Self: Sized,

Create an iterator that generates random values of T, using rng as the source of randomness.

fn map<F, S>(self, func: F) -> DistMap<Self, F, T, S>

where F: Fn(T) -> S, Self: Sized,

Create a distribution of values of ‘S’ by mapping the output of Self through the closure F

impl Eq for UtcOffset

#[doc(hidden)] fn assert_receiver_is_total_eq(&self)

impl Hash for UtcOffset

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Neg for UtcOffset

type Output = UtcOffset

The resulting type after applying the - operator.

fn neg(self) -> Self::Output

Performs the unary - operation.

impl Ord for UtcOffset

fn cmp(&self, other: &UtcOffset) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for UtcOffset

fn eq(&self, other: &UtcOffset) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for UtcOffset

fn partial_cmp(&self, other: &UtcOffset) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for UtcOffset

Available on crate feature serde only.

fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error>

Serialize this value into the given Serde serializer.

impl SmartDisplay for UtcOffset

type Metadata = UtcOffsetMetadata

User-provided metadata type.

fn metadata(&self, _: FormatterOptions) -> Metadata<'_, Self>

Compute any information needed to format the value. This must, at a minimum, determine the width of the value before any padding is added by the formatter.

fn fmt_with_metadata( &self, f: &mut Formatter<'_>, metadata: Metadata<'_, Self>, ) -> Result

Format the value using the given formatter and metadata. The formatted output should have the width indicated by the metadata. This is before any padding is added by the formatter.

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Format the value using the given formatter. This is the same as Display::fmt.

impl TryFrom<Parsed> for UtcOffset

Available on crate feature parsing only.

type Error = TryFromParsed

The type returned in the event of a conversion error.

fn try_from(parsed: Parsed) -> Result<Self, Self::Error>

Performs the conversion.

impl Copy for UtcOffset

impl StructuralPartialEq for UtcOffset