1.0.0[−][src]Trait frame_support::dispatch::fmt::Display
Format trait for an empty format, {}
.
Display
is similar to Debug
, but Display
is for user-facing
output, and so cannot be derived.
For more information on formatters, see the module-level documentation.
Examples
Implementing Display
on a type:
use std::fmt; struct Point { x: i32, y: i32, } impl fmt::Display for Point { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { write!(f, "({}, {})", self.x, self.y) } } let origin = Point { x: 0, y: 0 }; assert_eq!(format!("The origin is: {}", origin), "The origin is: (0, 0)");
Required methods
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>
Formats the value using the given formatter.
Examples
use std::fmt; struct Position { longitude: f32, latitude: f32, } impl fmt::Display for Position { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { write!(f, "({}, {})", self.longitude, self.latitude) } } assert_eq!("(1.987, 2.983)", format!("{}", Position { longitude: 1.987, latitude: 2.983, }));
Implementations on Foreign Types
impl<'_> Display for Display<'_>
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impl Display for FromVecWithNulError
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impl<W> Display for IntoInnerError<W>
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impl Display for SocketAddr
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impl Display for FromBytesWithNulError
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impl Display for SocketAddrV4
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impl Display for Ipv6Addr
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Write an Ipv6Addr, conforming to the canonical style described by RFC 5952.
impl Display for Ipv4Addr
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impl<T> Display for PoisonError<T>
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impl<T> Display for SendError<T>
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impl<T> Display for TryLockError<T>
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impl<'_, T> Display for RwLockWriteGuard<'_, T> where
T: Display + ?Sized,
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T: Display + ?Sized,
impl Display for ExitStatus
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impl Display for AccessError
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impl Display for AddrParseError
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impl<'_, T> Display for RwLockReadGuard<'_, T> where
T: Display + ?Sized,
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T: Display + ?Sized,
impl Display for SystemTimeError
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impl Display for StripPrefixError
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impl Display for SocketAddrV6
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impl Display for TryRecvError
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impl Display for VarError
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impl<T> Display for TrySendError<T>
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impl Display for Backtrace
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impl Display for IntoStringError
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impl Display for JoinPathsError
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impl<'_, T> Display for MutexGuard<'_, T> where
T: Display + ?Sized,
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T: Display + ?Sized,
impl Display for RecvTimeoutError
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impl Display for NulError
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impl Display for Error
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impl Display for IpAddr
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impl Display for RecvError
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impl<'a> Display for EscapeUnicode<'a>
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impl Display for ParseBoolError
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impl<'_, T> Display for RefMut<'_, T> where
T: Display + ?Sized,
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T: Display + ?Sized,
impl Display for NonZeroU16
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impl Display for NonZeroI8
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impl Display for i8
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impl<'_, T> Display for &'_ T where
T: Display + ?Sized,
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T: Display + ?Sized,
impl Display for EscapeUnicode
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impl<'_> Display for Location<'_>
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impl Display for NonZeroI32
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impl Display for ParseIntError
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impl Display for i32
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impl Display for Utf8Lossy
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impl Display for NonZeroI128
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impl<T> Display for Wrapping<T> where
T: Display,
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T: Display,
impl<'a> Display for EscapeDebug<'a>
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impl Display for BorrowMutError
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impl Display for CharTryFromError
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impl Display for u8
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impl Display for char
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impl Display for !
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impl Display for i128
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impl Display for i64
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impl Display for ParseCharError
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impl Display for ToLowercase
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impl Display for NonZeroI64
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impl<'_, T> Display for Ref<'_, T> where
T: Display + ?Sized,
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T: Display + ?Sized,
impl Display for isize
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impl Display for u64
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impl Display for NonZeroI16
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impl Display for Utf8Error
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impl Display for EscapeDebug
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impl Display for usize
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impl Display for u128
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impl Display for NonZeroU32
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impl Display for f64
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impl<'a> Display for EscapeDefault<'a>
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impl Display for bool
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impl Display for u16
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impl Display for NonZeroUsize
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impl Display for BorrowError
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impl<P> Display for Pin<P> where
P: Display,
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P: Display,
impl Display for LayoutErr
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impl Display for ParseFloatError
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impl Display for str
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impl Display for u32
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impl Display for ToUppercase
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impl Display for EscapeDefault
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impl Display for Infallible
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impl Display for EscapeDefault
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impl Display for NonZeroU64
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impl<'_> Display for PanicInfo<'_>
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impl Display for f32
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impl Display for NonZeroU8
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impl Display for NonZeroIsize
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impl Display for TryFromSliceError
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impl Display for DecodeUtf16Error
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impl Display for AllocErr
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impl Display for NonZeroU128
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impl<'_, T> Display for &'_ mut T where
T: Display + ?Sized,
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T: Display + ?Sized,
impl Display for TryFromIntError
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impl Display for i16
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impl<T> Display for Rc<T> where
T: Display + ?Sized,
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T: Display + ?Sized,
impl Display for FromUtf16Error
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impl<T> Display for Arc<T> where
T: Display + ?Sized,
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T: Display + ?Sized,
impl Display for String
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impl Display for FromUtf8Error
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impl<T> Display for Box<T> where
T: Display + ?Sized,
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T: Display + ?Sized,
impl<'_, B> Display for Cow<'_, B> where
B: Display + ToOwned + ?Sized,
<B as ToOwned>::Owned: Display,
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B: Display + ToOwned + ?Sized,
<B as ToOwned>::Owned: Display,
impl Display for TryReserveError
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impl Display for Error
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impl<A> Display for ArrayString<A> where
A: Array<Item = u8> + Copy,
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A: Array<Item = u8> + Copy,
impl<T> Display for CapacityError<T>
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impl Display for Error
impl<'a> Display for Unexpected<'a>
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impl Display for Error
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impl<'a> Display for dyn Expected + 'a
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impl Display for Field
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impl Display for dyn Value + 'static
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impl Display for FieldSet
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impl Display for SetGlobalDefaultError
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impl Display for Level
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impl Display for LevelFilter
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impl<'a> Display for ValueSet<'a>
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impl Display for ParseLevelError
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impl Display for ParseLevelFilterError
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impl<T> Display for DisplayValue<T> where
T: Display,
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T: Display,
impl Display for FromEnvError
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impl Display for Error
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impl Display for TryInitError
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impl Display for ParseError
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impl Display for Directive
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impl<E> Display for FormattedFields<E>
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impl Display for BadName
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impl Display for EnvFilter
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impl Display for Error
impl Display for Regex
impl Display for Regex
impl Display for Error
impl Display for Error
impl Display for Ast
Print a display representation of this Ast.
This does not preserve any of the original whitespace formatting that may have originally been present in the concrete syntax from which this Ast was generated.
This implementation uses constant stack space and heap space proportional
to the size of the Ast
.
impl Display for Hir
Print a display representation of this Hir.
The result of this is a valid regular expression pattern string.
This implementation uses constant stack space and heap space proportional
to the size of the Hir
.
impl Display for ErrorKind
impl Display for UnicodeWordError
impl Display for ErrorKind
impl Display for Error
impl Display for CaseFoldError
impl Display for Error
impl Display for Error
impl Display for ParseLevelError
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impl Display for SetLoggerError
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impl Display for Level
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impl Display for LevelFilter
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impl<'a> Display for ANSIGenericStrings<'a, str>
impl<'a> Display for ANSIGenericString<'a, str>
impl Display for Suffix
impl Display for Prefix
impl Display for Infix
impl Display for Value
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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>
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Display a JSON value as a string.
let json = json!({ "city": "London", "street": "10 Downing Street" }); // Compact format: // // {"city":"London","street":"10 Downing Street"} let compact = format!("{}", json); assert_eq!(compact, "{\"city\":\"London\",\"street\":\"10 Downing Street\"}"); // Pretty format: // // { // "city": "London", // "street": "10 Downing Street" // } let pretty = format!("{:#}", json); assert_eq!(pretty, "{\n \"city\": \"London\",\n \"street\": \"10 Downing Street\"\n}");
impl Display for Error
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impl Display for Number
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impl Display for NaiveDate
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The Display
output of the naive date d
is the same as
d.format("%Y-%m-%d")
.
The string printed can be readily parsed via the parse
method on str
.
Example
use chrono::NaiveDate; assert_eq!(format!("{}", NaiveDate::from_ymd(2015, 9, 5)), "2015-09-05"); assert_eq!(format!("{}", NaiveDate::from_ymd( 0, 1, 1)), "0000-01-01"); assert_eq!(format!("{}", NaiveDate::from_ymd(9999, 12, 31)), "9999-12-31");
ISO 8601 requires an explicit sign for years before 1 BCE or after 9999 CE.
assert_eq!(format!("{}", NaiveDate::from_ymd( -1, 1, 1)), "-0001-01-01"); assert_eq!(format!("{}", NaiveDate::from_ymd(10000, 12, 31)), "+10000-12-31");
impl Display for NaiveTime
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The Display
output of the naive time t
is the same as
t.format("%H:%M:%S%.f")
.
The string printed can be readily parsed via the parse
method on str
.
It should be noted that, for leap seconds not on the minute boundary, it may print a representation not distinguishable from non-leap seconds. This doesn't matter in practice, since such leap seconds never happened. (By the time of the first leap second on 1972-06-30, every time zone offset around the world has standardized to the 5-minute alignment.)
Example
use chrono::NaiveTime; assert_eq!(format!("{}", NaiveTime::from_hms(23, 56, 4)), "23:56:04"); assert_eq!(format!("{}", NaiveTime::from_hms_milli(23, 56, 4, 12)), "23:56:04.012"); assert_eq!(format!("{}", NaiveTime::from_hms_micro(23, 56, 4, 1234)), "23:56:04.001234"); assert_eq!(format!("{}", NaiveTime::from_hms_nano(23, 56, 4, 123456)), "23:56:04.000123456");
Leap seconds may also be used.
assert_eq!(format!("{}", NaiveTime::from_hms_milli(6, 59, 59, 1_500)), "06:59:60.500");
impl Display for RoundingError
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impl Display for Weekday
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impl<'a, I, B> Display for DelayedFormat<I> where
B: Borrow<Item<'a>>,
I: Clone + Iterator<Item = B>,
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B: Borrow<Item<'a>>,
I: Clone + Iterator<Item = B>,
impl Display for Utc
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impl<Tz> Display for Date<Tz> where
Tz: TimeZone,
<Tz as TimeZone>::Offset: Display,
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Tz: TimeZone,
<Tz as TimeZone>::Offset: Display,
impl<Tz> Display for DateTime<Tz> where
Tz: TimeZone,
<Tz as TimeZone>::Offset: Display,
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Tz: TimeZone,
<Tz as TimeZone>::Offset: Display,
impl Display for FixedOffset
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impl Display for ParseError
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impl Display for NaiveDateTime
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The Debug
output of the naive date and time dt
is the same as
dt.format("%Y-%m-%d %H:%M:%S%.f")
.
It should be noted that, for leap seconds not on the minute boundary, it may print a representation not distinguishable from non-leap seconds. This doesn't matter in practice, since such leap seconds never happened. (By the time of the first leap second on 1972-06-30, every time zone offset around the world has standardized to the 5-minute alignment.)
Example
use chrono::NaiveDate; let dt = NaiveDate::from_ymd(2016, 11, 15).and_hms(7, 39, 24); assert_eq!(format!("{}", dt), "2016-11-15 07:39:24");
Leap seconds may also be used.
let dt = NaiveDate::from_ymd(2015, 6, 30).and_hms_milli(23, 59, 59, 1_500); assert_eq!(format!("{}", dt), "2015-06-30 23:59:60.500");
impl Display for ParseError
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impl<'a> Display for TmFmt<'a>
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impl Display for SteadyTime
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impl Display for Duration
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impl Display for OutOfRangeError
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impl Display for ParseFloatError
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impl Display for CryptoTypePublicPair
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impl Display for ParseError
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impl Display for Public
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impl Display for CodeNotFound
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impl<'a> Display for HexDisplay<'a>
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impl Display for AccountId32
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impl Display for Public
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impl Display for Error
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impl Display for Ss58AddressFormat
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impl Display for Public
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impl Display for Trap
impl Display for Error
impl Display for Error
impl Display for ValueType
impl Display for Instruction
impl Display for Error
impl Display for Error
impl<T> Display for Ratio<T> where
T: Display + Eq + One,
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T: Display + Eq + One,
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>
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Renders as numer/denom
. If denom=1, renders as numer.
impl Display for ParseRatioError
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impl Display for BigUint
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impl Display for ParseBigIntError
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impl Display for BigInt
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impl Display for U256
impl Display for U128
impl Display for H160
impl Display for H512
impl Display for H256
impl Display for U512
impl Display for FromHexError
impl Display for WeightedError
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impl Display for ReadError
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impl Display for BernoulliError
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impl Display for Error
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impl Display for Error
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impl Display for FromDecStrErr
impl<A> Display for ArrayString<A> where
A: Array<Item = u8>,
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A: Array<Item = u8>,
impl<T> Display for CapacityError<T>
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impl Display for InvalidOutputSize
impl<'a, R, G, T> Display for MappedReentrantMutexGuard<'a, R, G, T> where
G: 'a + GetThreadId,
R: 'a + RawMutex,
T: 'a + Display + ?Sized,
G: 'a + GetThreadId,
R: 'a + RawMutex,
T: 'a + Display + ?Sized,
impl<'a, R, T> Display for MappedRwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + Display + ?Sized,
R: 'a + RawRwLock,
T: 'a + Display + ?Sized,
impl<'a, R, T> Display for RwLockUpgradableReadGuard<'a, R, T> where
R: 'a + RawRwLockUpgrade,
T: 'a + Display + ?Sized,
R: 'a + RawRwLockUpgrade,
T: 'a + Display + ?Sized,
impl<'a, R, G, T> Display for ReentrantMutexGuard<'a, R, G, T> where
G: 'a + GetThreadId,
R: 'a + RawMutex,
T: 'a + Display + ?Sized,
G: 'a + GetThreadId,
R: 'a + RawMutex,
T: 'a + Display + ?Sized,
impl<'a, R, T> Display for MutexGuard<'a, R, T> where
R: 'a + RawMutex,
T: 'a + Display + ?Sized,
R: 'a + RawMutex,
T: 'a + Display + ?Sized,
impl<'a, R, T> Display for RwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + Display + ?Sized,
R: 'a + RawRwLock,
T: 'a + Display + ?Sized,
impl<'a, R, T> Display for MappedMutexGuard<'a, R, T> where
R: 'a + RawMutex,
T: 'a + Display + ?Sized,
R: 'a + RawMutex,
T: 'a + Display + ?Sized,
impl<'a, R, T> Display for RwLockReadGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + Display + ?Sized,
R: 'a + RawRwLock,
T: 'a + Display + ?Sized,
impl<'a, R, T> Display for MappedRwLockReadGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + Display + ?Sized,
R: 'a + RawRwLock,
T: 'a + Display + ?Sized,
impl Display for Error
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impl Display for InvalidOutputSize
impl Display for InvalidKeyLength
impl Display for MacError
impl Display for MultiSignatureStage
impl Display for SignatureError
impl Display for MnemonicType
impl Display for ErrorKind
impl Display for Mnemonic
impl Display for Backtrace
impl Display for Error
impl<D> Display for Context<D> where
D: 'static + Send + Sync + Display,
D: 'static + Send + Sync + Display,
impl<E> Display for Compat<E> where
E: Display,
E: Display,
impl<T> Display for SyncFailure<T> where
T: Display,
T: Display,
impl<'a> Display for BytesOrWideString<'a>
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impl<'a> Display for SymbolName<'a>
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impl<'a> Display for Demangle<'a>
impl Display for DwCfa
impl Display for DwCc
impl Display for DwLns
impl Display for DwInl
impl Display for DwEnd
impl Display for DwDsc
impl Display for DwAccess
impl Display for DwVirtuality
impl Display for DwDefaulted
impl Display for DwLang
impl Display for DwRle
impl Display for DwId
impl Display for DwEhPe
impl Display for DwTag
impl Display for Error
impl Display for DwMacro
impl Display for DwOp
impl Display for DwLle
impl Display for DwUt
impl Display for DwChildren
impl Display for DwForm
impl Display for DwOrd
impl Display for DwLne
impl Display for DwLnct
impl Display for DwAt
impl Display for DwAddr
impl Display for DwDs
impl<R, Offset> Display for LineInstruction<R, Offset> where
Offset: ReaderOffset,
R: Reader<Offset = Offset>,
Offset: ReaderOffset,
R: Reader<Offset = Offset>,
impl Display for DwAte
impl Display for DwIdx
impl Display for DwVis
impl Display for Error
impl<'a, R, T> Display for RwLockReadGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + Display + ?Sized,
R: 'a + RawRwLock,
T: 'a + Display + ?Sized,
impl<'a, R, G, T> Display for MappedReentrantMutexGuard<'a, R, G, T> where
G: 'a + GetThreadId,
R: 'a + RawMutex,
T: 'a + Display + ?Sized,
G: 'a + GetThreadId,
R: 'a + RawMutex,
T: 'a + Display + ?Sized,
impl<'a, R, T> Display for MappedRwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + Display + ?Sized,
R: 'a + RawRwLock,
T: 'a + Display + ?Sized,
impl<'a, R, T> Display for RwLockWriteGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + Display + ?Sized,
R: 'a + RawRwLock,
T: 'a + Display + ?Sized,
impl<'a, R, T> Display for MutexGuard<'a, R, T> where
R: 'a + RawMutex,
T: 'a + Display + ?Sized,
R: 'a + RawMutex,
T: 'a + Display + ?Sized,
impl<'a, R, T> Display for MappedMutexGuard<'a, R, T> where
R: 'a + RawMutex,
T: 'a + Display + ?Sized,
R: 'a + RawMutex,
T: 'a + Display + ?Sized,
impl<'a, R, T> Display for RwLockUpgradableReadGuard<'a, R, T> where
R: 'a + RawRwLockUpgrade,
T: 'a + Display + ?Sized,
R: 'a + RawRwLockUpgrade,
T: 'a + Display + ?Sized,
impl<'a, R, T> Display for MappedRwLockReadGuard<'a, R, T> where
R: 'a + RawRwLock,
T: 'a + Display + ?Sized,
R: 'a + RawRwLock,
T: 'a + Display + ?Sized,
impl<'a, R, G, T> Display for ReentrantMutexGuard<'a, R, G, T> where
G: 'a + GetThreadId,
R: 'a + RawMutex,
T: 'a + Display + ?Sized,
G: 'a + GetThreadId,
R: 'a + RawMutex,
T: 'a + Display + ?Sized,
impl<I> Display for Decompositions<I> where
I: Clone + Iterator<Item = char>,
I: Clone + Iterator<Item = char>,
impl<I> Display for Recompositions<I> where
I: Clone + Iterator<Item = char>,
I: Clone + Iterator<Item = char>,
impl<A> Display for TinyVec<A> where
A: Array,
<A as Array>::Item: Display,
A: Array,
<A as Array>::Item: Display,
impl<A> Display for ArrayVec<A> where
A: Array,
<A as Array>::Item: Display,
A: Array,
<A as Array>::Item: Display,
impl Display for Error
impl Display for FromHexError
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impl<T, Item> Display for ReuniteError<T, Item>
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impl<T> Display for ReuniteError<T>
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impl Display for Aborted
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impl Display for SpawnError
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impl Display for Canceled
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impl Display for SendError
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impl Display for TryRecvError
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impl<T> Display for TrySendError<T>
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impl Display for EnterError
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impl Display for ExecutionError
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impl Display for Error
impl<HO, CE> Display for Error<HO, CE> where
CE: Error,
HO: Debug,
CE: Error,
HO: Debug,
impl<T, E> Display for TrieError<T, E> where
E: MaybeDebug,
T: MaybeDebug,
E: MaybeDebug,
T: MaybeDebug,
impl Display for RuntimeString
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impl<Block> Display for BlockId<Block> where
Block: Block,
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Block: Block,
impl Display for MultiSigner
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impl Display for Public
impl Display for Public
impl Display for Public
impl Display for FixedI64
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impl Display for FixedI128
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impl Display for FixedU128
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impl<L, R> Display for Either<L, R> where
L: Display,
R: Display,
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L: Display,
R: Display,