Struct tracing_subscriber::fmt::time::LocalTime

pub struct LocalTime<F> { /* private fields */ }

Available on crate feature fmt and crate feature std and unsound_local_offset and crate feature local-time and crate feature time only.

Formats the current local time using a formatter from the time crate.

To format the current UTC time instead, use the UtcTime type.

    Warning: The time
    crate must be compiled with --cfg unsound_local_offset in order to use
    local timestamps. When this cfg is not enabled, local timestamps cannot be recorded, and
    events will be logged without timestamps.
Alternatively, OffsetTime can log with a local offset if it is initialized early.
See the time
documentation for more details.

Implementations

impl LocalTime<Rfc3339>

pub fn rfc_3339() -> Self

Returns a formatter that formats the current local time in the RFC 3339 format (a subset of the ISO 8601 timestamp format).

Examples

use tracing_subscriber::fmt::{self, time};

let subscriber = tracing_subscriber::fmt()
    .with_timer(time::LocalTime::rfc_3339());

impl<F: Formattable> LocalTime<F>

pub fn new(format: F) -> Self

Returns a formatter that formats the current local time using the time crate with the provided provided format. The format may be any type that implements the Formattable trait.

    Warning: The 
    time crate must be compiled with --cfg
    unsound_local_offset in order to use local timestamps. When this
    cfg is not enabled, local timestamps cannot be recorded, and
    events will be logged without timestamps.
See the 
time documentation for more details.

Typically, the format will be a format description string, or one of the time crate’s well-known formats.

If the format description is statically known, then the format_description! macro should be used. This is identical to the time::format_description::parse method, but runs at compile-time, throwing an error if the format description is invalid. If the desired format is not known statically (e.g., a user is providing a format string), then the time::format_description::parse method should be used. Note that this method is fallible.

See the time book for details on the format description syntax.

Examples

Using the format_description! macro:

use tracing_subscriber::fmt::{self, time::LocalTime};
use time::macros::format_description;

let timer = LocalTime::new(format_description!("[hour]:[minute]:[second]"));
let subscriber = tracing_subscriber::fmt()
    .with_timer(timer);

Using time::format_description::parse:

use tracing_subscriber::fmt::{self, time::LocalTime};

let time_format = time::format_description::parse("[hour]:[minute]:[second]")
    .expect("format string should be valid!");
let timer = LocalTime::new(time_format);
let subscriber = tracing_subscriber::fmt()
    .with_timer(timer);

Using the format_description! macro requires enabling the time crate’s “macros” feature flag.

Using a well-known format (this is equivalent to LocalTime::rfc_3339):

use tracing_subscriber::fmt::{self, time::LocalTime};

let timer = LocalTime::new(time::format_description::well_known::Rfc3339);
let subscriber = tracing_subscriber::fmt()
    .with_timer(timer);

Trait Implementations

impl<F: Clone> Clone for LocalTime<F>

fn clone(&self) -> LocalTime<F>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<F: Debug> Debug for LocalTime<F>

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

Formats the value using the given formatter.

impl<F> Default for LocalTime<F>

where F: Formattable + Default,

fn default() -> Self

Returns the “default value” for a type.

impl<F> FormatTime for LocalTime<F>

where F: Formattable,

fn format_time(&self, w: &mut Writer<'_>) -> Result

Measure and write out the current time.