Struct time::UtcOffset

pub struct UtcOffset { /* private fields */ }

An offset from UTC.

Guaranteed to store values up to ±23:59:59. Any values outside this range may have incidental support that can change at any time without notice. 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 east_hours(hours: u8) -> Self

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

assert_eq!(UtcOffset::east_hours(1).as_hours(), 1);
assert_eq!(UtcOffset::east_hours(2).as_minutes(), 120);

pub const fn west_hours(hours: u8) -> Self

Create a UtcOffset representing a westerly offset by the number of hours provided.

assert_eq!(UtcOffset::west_hours(1).as_hours(), -1);
assert_eq!(UtcOffset::west_hours(2).as_minutes(), -120);

pub const fn hours(hours: i8) -> Self

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

assert_eq!(UtcOffset::hours(2).as_minutes(), 120);
assert_eq!(UtcOffset::hours(-2).as_minutes(), -120);

pub const fn east_minutes(minutes: u16) -> Self

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

assert_eq!(UtcOffset::east_minutes(60).as_hours(), 1);

pub const fn west_minutes(minutes: u16) -> Self

Create a UtcOffset representing a westerly offset by the number of minutes provided.

assert_eq!(UtcOffset::west_minutes(60).as_hours(), -1);

pub const fn minutes(minutes: i16) -> Self

Create a UtcOffset representing a offset by the number of minutes provided.

assert_eq!(UtcOffset::minutes(60).as_hours(), 1);
assert_eq!(UtcOffset::minutes(-60).as_hours(), -1);

pub const fn east_seconds(seconds: u32) -> Self

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

assert_eq!(UtcOffset::east_seconds(3_600).as_hours(), 1);
assert_eq!(UtcOffset::east_seconds(1_800).as_minutes(), 30);

pub const fn west_seconds(seconds: u32) -> Self

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

assert_eq!(UtcOffset::west_seconds(3_600).as_hours(), -1);
assert_eq!(UtcOffset::west_seconds(1_800).as_minutes(), -30);

pub const fn seconds(seconds: i32) -> Self

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

assert_eq!(UtcOffset::seconds(3_600).as_hours(), 1);
assert_eq!(UtcOffset::seconds(-3_600).as_hours(), -1);

pub const fn as_seconds(self) -> i32

Get the number of seconds from UTC the value is. Positive is east, negative is west.

assert_eq!(UtcOffset::UTC.as_seconds(), 0);
assert_eq!(UtcOffset::hours(12).as_seconds(), 43_200);
assert_eq!(UtcOffset::hours(-12).as_seconds(), -43_200);

pub const fn as_minutes(self) -> i16

Get the number of minutes from UTC the value is. Positive is east, negative is west.

assert_eq!(UtcOffset::UTC.as_minutes(), 0);
assert_eq!(UtcOffset::hours(12).as_minutes(), 720);
assert_eq!(UtcOffset::hours(-12).as_minutes(), -720);

pub const fn as_hours(self) -> i8

Get the number of hours from UTC the value is. Positive is east, negative is west.

assert_eq!(UtcOffset::UTC.as_hours(), 0);
assert_eq!(UtcOffset::hours(12).as_hours(), 12);
assert_eq!(UtcOffset::hours(-12).as_hours(), -12);

pub fn local_offset_at(datetime: OffsetDateTime) -> Self

👎 Deprecated since 0.2.23:

UTC is returned if the local offset cannot be determined

Obtain the system’s UTC offset at a known moment in time. If the offset cannot be determined, UTC is returned.

let unix_epoch = OffsetDateTime::unix_epoch();
let local_offset = UtcOffset::local_offset_at(unix_epoch);
println!("{}", local_offset.format("%z"));

pub fn try_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 unix_epoch = OffsetDateTime::unix_epoch();
let local_offset = UtcOffset::try_local_offset_at(unix_epoch);
assert!(local_offset.is_ok());

pub fn current_local_offset() -> Self

👎 Deprecated since 0.2.23:

UTC is returned if the local offset cannot be determined

Obtain the system’s current UTC offset. If the offset cannot be determined, UTC is returned.

let local_offset = UtcOffset::current_local_offset();
println!("{}", local_offset.format("%z"));

pub fn try_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::try_current_local_offset();
assert!(local_offset.is_ok());

impl UtcOffset

Methods that allow parsing and formatting the UtcOffset.

pub fn format(self, format: impl AsRef<str>) -> String

Format the UtcOffset using the provided string.

assert_eq!(UtcOffset::hours(2).format("%z"), "+0200");
assert_eq!(UtcOffset::hours(-2).format("%z"), "-0200");

pub fn lazy_format(self, format: impl AsRef<str>) -> impl Display

Format the UtcOffset using the provided string.

assert_eq!(UtcOffset::hours(2).lazy_format("%z").to_string(), "+0200");
assert_eq!(UtcOffset::hours(-2).lazy_format("%z").to_string(), "-0200");

pub fn parse(s: impl AsRef<str>, format: impl AsRef<str>) -> Result<Self, Error>

Attempt to parse the UtcOffset using the provided string.

assert_eq!(UtcOffset::parse("+0200", "%z"), Ok(UtcOffset::hours(2)));
assert_eq!(UtcOffset::parse("-0200", "%z"), Ok(UtcOffset::hours(-2)));

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 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