Struct time::UtcOffset

pub struct UtcOffset { /* fields omitted */ }

An offset from UTC.

This struct can store values up to ±23:59:59. If you need support outside this range, please file an issue with your use case.

Implementations

impl UtcOffset

pub const UTC: Self

A UtcOffset that is UTC.

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

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 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 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 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>

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>

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>

Format the UtcOffset using the provided format description.

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

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");

Trait Implementations

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 Display for UtcOffset

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

Formats the value using the given formatter.

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, 

Feeds a slice of this type into the given Hasher.

impl Neg for UtcOffset

type Output = Self

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

Compares and returns the maximum of two values.

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

Compares and returns the minimum of two values.

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

Restrict a value to a certain interval.

impl PartialEq<UtcOffset> for UtcOffset

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl PartialOrd<UtcOffset> 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

This method tests less than (for self and other) and is used by the < operator.

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

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

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

This method tests greater than (for self and other) and is used by the > operator.

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

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

impl Copy for UtcOffset

impl Eq for UtcOffset

impl StructuralEq for UtcOffset

impl StructuralPartialEq for UtcOffset