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<main>
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<h1 id="解析和显示"><a class="header" href="#解析和显示">解析和显示</a></h1>
|
|
|
<h3 id="检查日期和时间"><a class="header" href="#检查日期和时间">检查日期和时间</a></h3>
|
|
|
<p>通过 <a href="https://docs.rs/chrono/*/chrono/struct.DateTime.html">DateTime</a> 获取当前的 UTC 时间:</p>
|
|
|
<ul>
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|
<li><a href="https://docs.rs/chrono/*/chrono/trait.Timelike.html">Timelike</a>, 时/分/秒</li>
|
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|
<li><a href="https://docs.rs/chrono/*/chrono/trait.Datelike.html">Datelike</a>, 年/月/日</li>
|
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</ul>
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<pre><pre class="playground"><code class="language-rust editable edition2021">use chrono::{Datelike, Timelike, Utc};
|
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fn main() {
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let now = Utc::now();
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let (is_pm, hour) = now.hour12();
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println!(
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"The current UTC time is {:02}:{:02}:{:02} {}",
|
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|
hour,
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|
now.minute(),
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|
now.second(),
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|
if is_pm { "PM" } else { "AM" }
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|
);
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|
println!(
|
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|
"And there have been {} seconds since midnight",
|
|
|
now.num_seconds_from_midnight()
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|
);
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|
let (is_common_era, year) = now.year_ce();
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|
println!(
|
|
|
"The current UTC date is {}-{:02}-{:02} {:?} ({})",
|
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|
year,
|
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|
now.month(),
|
|
|
now.day(),
|
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|
now.weekday(),
|
|
|
if is_common_era { "CE" } else { "BCE" }
|
|
|
);
|
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|
println!(
|
|
|
"And the Common Era began {} days ago",
|
|
|
now.num_days_from_ce()
|
|
|
);
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|
}
|
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</code></pre></pre>
|
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<h3 id="日期和时间戳的相互转换"><a class="header" href="#日期和时间戳的相互转换">日期和时间戳的相互转换</a></h3>
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<pre><pre class="playground"><code class="language-rust editable edition2021">use chrono::{NaiveDate, NaiveDateTime};
|
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|
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|
fn main() {
|
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|
// 生成一个具体的日期时间
|
|
|
let date_time: NaiveDateTime = NaiveDate::from_ymd(2017, 11, 12).and_hms(17, 33, 44);
|
|
|
println!(
|
|
|
"Number of seconds between 1970-01-01 00:00:00 and {} is {}.",
|
|
|
// 打印日期和日期对应的时间戳
|
|
|
date_time, date_time.timestamp());
|
|
|
|
|
|
// 计算从 1970 1月1日 0:00:00 UTC 开始，10亿秒后是什么日期时间
|
|
|
let date_time_after_a_billion_seconds = NaiveDateTime::from_timestamp(1_000_000_000, 0);
|
|
|
println!(
|
|
|
"Date after a billion seconds since 1970-01-01 00:00:00 was {}.",
|
|
|
date_time_after_a_billion_seconds);
|
|
|
}
|
|
|
</code></pre></pre>
|
|
|
<h3 id="显示格式化的日期和时间"><a class="header" href="#显示格式化的日期和时间">显示格式化的日期和时间</a></h3>
|
|
|
<p>通过 <a href="https://docs.rs/chrono/*/chrono/offset/struct.Utc.html#method.now">Utc::now</a> 可以获取当前的 UTC 时间。</p>
|
|
|
<pre><pre class="playground"><code class="language-rust editable edition2021">use chrono::{DateTime, Utc};
|
|
|
|
|
|
fn main() {
|
|
|
let now: DateTime<Utc> = Utc::now();
|
|
|
|
|
|
println!("UTC now is: {}", now);
|
|
|
// 使用 RFC 2822 格式显示当前时间
|
|
|
println!("UTC now in RFC 2822 is: {}", now.to_rfc2822());
|
|
|
// 使用 RFC 3339 格式显示当前时间
|
|
|
println!("UTC now in RFC 3339 is: {}", now.to_rfc3339());
|
|
|
// 使用自定义格式显示当前时间
|
|
|
println!("UTC now in a custom format is: {}", now.format("%a %b %e %T %Y"));
|
|
|
}
|
|
|
</code></pre></pre>
|
|
|
<h3 id="将字符串解析为-datetime-结构体"><a class="header" href="#将字符串解析为-datetime-结构体">将字符串解析为 DateTime 结构体</a></h3>
|
|
|
<p>我们可以将多种格式的日期时间字符串转换成 <a href="https://docs.rs/chrono/*/chrono/struct.DateTime.html">DateTime</a> 结构体。<a href="https://docs.rs/chrono/*/chrono/struct.DateTime.html#method.parse_from_str">DateTime::parse_from_str</a> 使用的转义序列可以在 <a href="https://docs.rs/chrono/0.4.19/chrono/format/strftime/index.html">chrono::format::strftime</a> 找到.</p>
|
|
|
<p>只有当能唯一的标识出日期和时间时，才能创建 <code>DateTime</code>。如果要在没有时区的情况下解析日期或时间，你需要使用 <a href="https://docs.rs/chrono/*/chrono/naive/struct.NaiveDate.html"><code>NativeDate</code></a> 等函数。</p>
|
|
|
<pre><pre class="playground"><code class="language-rust editable edition2021">use chrono::{DateTime, NaiveDate, NaiveDateTime, NaiveTime};
|
|
|
use chrono::format::ParseError;
|
|
|
|
|
|
|
|
|
fn main() -> Result<(), ParseError> {
|
|
|
let rfc2822 = DateTime::parse_from_rfc2822("Tue, 1 Jul 2003 10:52:37 +0200")?;
|
|
|
println!("{}", rfc2822);
|
|
|
|
|
|
let rfc3339 = DateTime::parse_from_rfc3339("1996-12-19T16:39:57-08:00")?;
|
|
|
println!("{}", rfc3339);
|
|
|
|
|
|
let custom = DateTime::parse_from_str("5.8.1994 8:00 am +0000", "%d.%m.%Y %H:%M %P %z")?;
|
|
|
println!("{}", custom);
|
|
|
|
|
|
let time_only = NaiveTime::parse_from_str("23:56:04", "%H:%M:%S")?;
|
|
|
println!("{}", time_only);
|
|
|
|
|
|
let date_only = NaiveDate::parse_from_str("2015-09-05", "%Y-%m-%d")?;
|
|
|
println!("{}", date_only);
|
|
|
|
|
|
let no_timezone = NaiveDateTime::parse_from_str("2015-09-05 23:56:04", "%Y-%m-%d %H:%M:%S")?;
|
|
|
println!("{}", no_timezone);
|
|
|
|
|
|
Ok(())
|
|
|
}
|
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