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Add example for formatting chrono::DateTime

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Add example for formatting chrono::DateTime
This commit is contained in:
Henri Lunnikivi 2017-10-27 18:16:48 +03:00 committed by Michał Budzyński
parent 477d82f4b4
commit 00af9d15c0
3 changed files with 35 additions and 0 deletions
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31
src/basics.md
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@ -26,6 +26,7 @@
| [Check number of logical cpu cores][ex-check-cpu-cores] | [![num_cpus-badge]][num_cpus] | [![cat-hardware-support-badge]][cat-hardware-support] |
| [Obtain backtrace of complex error scenarios][ex-error-chain-backtrace] | [![error-chain-badge]][error-chain] | [![cat-rust-patterns-badge]][cat-rust-patterns] |
| [Measure elapsed time][ex-measure-elapsed-time] | [![std-badge]][std] | [![cat-time-badge]][cat-time] |
| [Display formatted date and time][ex-format-datetime] | [![chrono-badge]][chrono] | [![cat-date-and-time-badge]][cat-date-and-time] |
[ex-std-read-lines]: #ex-std-read-lines
<a name="ex-std-read-lines"></a>
@ -1217,6 +1218,30 @@ fn main() {
}
```
[ex-format-datetime]: #ex-format-datetime
<a name="ex-format-datetime"></a>
## Display formatted date and time
[![chrono-badge]][chrono] [![cat-date-and-time-badge]][cat-date-and-time]
Gets and displays the current time in UTC using [`Utc::now`]. Formats the
current time in the well-known formats [RFC 2822] using [`DateTime::to_rfc2822`]
and [RFC 3339] using [`DateTime::to_rfc3339`], and in a custom format using
[`DateTime::format`].
```rust
extern crate chrono;
use chrono::{DateTime, Utc};
fn main() {
let now: DateTime<Utc> = Utc::now();
println!("UTC now is: {}", now);
println!("UTC now in RFC 2822 is: {}", now.to_rfc2822());
println!("UTC now in RFC 3339 is: {}", now.to_rfc3339());
println!("UTC now in a custom format is: {}", now.format("%a %b %e %T %Y"));
}
```
{{#include links.md}}
<!-- API Reference -->
@ -1268,6 +1293,10 @@ fn main() {
[`SecureRandom::fill`]: https://docs.rs/ring/*/ring/rand/trait.SecureRandom.html#tymethod.fill
[`seek`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.seek
[`Stdio::piped`]: https://doc.rust-lang.org/std/process/struct.Stdio.html
[`Utc::now`]: https://docs.rs/chrono/*/chrono/offset/struct.Utc.html#method.now
[`DateTime::to_rfc2822`]: https://docs.rs/chrono/*/chrono/struct.DateTime.html#method.to_rfc2822
[`DateTime::to_rfc3339`]: https://docs.rs/chrono/*/chrono/struct.DateTime.html#method.to_rfc3339
[`DateTime::format`]: https://docs.rs/chrono/*/chrono/struct.DateTime.html#method.format
[rand-distributions]: https://doc.rust-lang.org/rand/rand/distributions/index.html
[replacement string syntax]: https://docs.rs/regex/*/regex/struct.Regex.html#replacement-string-syntax
@ -1275,5 +1304,7 @@ fn main() {
[race-condition-file]: https://en.wikipedia.org/wiki/Race_condition#File_systems
[raw string literals]: https://doc.rust-lang.org/reference/tokens.html#raw-string-literals
[RFC 2822]: https://www.ietf.org/rfc/rfc2822.txt
[RFC 3339]: https://www.ietf.org/rfc/rfc3339.txt
[twitter hashtag regex]: https://github.com/twitter/twitter-text/blob/c9fc09782efe59af4ee82855768cfaf36273e170/java/src/com/twitter/Regex.java#L255
[uniform distribution]: https://en.wikipedia.org/wiki/Uniform_distribution_(continuous)

2
src/intro.md
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@ -44,6 +44,7 @@ community. It needs and welcomes help. For details see
| [Check number of logical cpu cores][ex-check-cpu-cores] | [![num_cpus-badge]][num_cpus] | [![cat-hardware-support-badge]][cat-hardware-support] |
| [Obtain backtrace of complex error scenarios][ex-error-chain-backtrace] | [![error-chain-badge]][error-chain] | [![cat-rust-patterns-badge]][cat-rust-patterns] |
| [Measure elapsed time][ex-measure-elapsed-time] | [![std-badge]][std] | [![cat-time-badge]][cat-time] |
| [Display formatted date and time][ex-format-datetime] | [![chrono-badge]][chrono] | [![cat-date-and-time-badge]][cat-date-and-time] |
## [Encoding](encoding.html)
@ -159,6 +160,7 @@ community. It needs and welcomes help. For details see
[ex-csv-serde]: encoding.html#ex-csv-serde
[ex-csv-read]: encoding.html#ex-csv-read
[ex-csv-delimiter]: encoding.html#ex-csv-delimiter
[ex-format-datetime]: basics.html#ex-format-datetime
[ex-threadpool-fractal]: concurrency.html#ex-threadpool-fractal
[ex-threadpool-walk]: concurrency.html#ex-threadpool-walk
[ex-dedup-filenames]: app.html#ex-dedup-filenames

2
src/links.md
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@ -17,6 +17,8 @@ Keep lines sorted.
[cat-concurrency]: https://crates.io/categories/concurrency
[cat-cryptography-badge]: https://badge-cache.kominick.com/badge/cryptography--x.svg?style=social
[cat-cryptography]: https://crates.io/categories/cryptography
[cat-date-and-time-badge]: https://badge-cache.kominick.com/badge/date_and_time--x.svg?style=social
[cat-date-and-time]: https://crates.io/categories/date-and-time
[cat-debugging-badge]: https://badge-cache.kominick.com/badge/debugging--x.svg?style=social
[cat-debugging]: https://crates.io/categories/debugging
[cat-development-tools-badge]: https://badge-cache.kominick.com/badge/development_tools--x.svg?style=social