Struct UtcTime

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

Available on crate features fmt and std and time only.

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

To format the current local time instead, use the LocalTime type.

Implementations

impl UtcTime<Rfc3339>

pub fn rfc_3339() -> Self

Returns a formatter that formats the current [UTC time] in the RFC 3339 format, which is a subset of the ISO 8601 timestamp format.

Examples

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

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

impl<F: Formattable> UtcTime<F>

pub fn new(format: F) -> Self

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

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, failing 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::UtcTime};
use time::macros::format_description;

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

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

Using time::format_description::parse:

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

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

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

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

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

Trait Implementations

impl<F: Clone> Clone for UtcTime<F>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<F: Debug> Debug for UtcTime<F>

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

Formats the value using the given formatter.

impl<F> Default for UtcTime<F>

where F: Formattable + Default,

fn default() -> Self

Returns the “default value” for a type.

impl<F> FormatTime for UtcTime<F>

where F: Formattable,

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

Measure and write out the current time.