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<a href="." >Custom date format</a>
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<h1 id="date-in-a-custom-format"><a name="date-in-a-custom-format" class="plugin-anchor" href="#date-in-a-custom-format"><i class="fa fa-link" aria-hidden="true"></i></a>Date in a custom format</h1>
<p>This uses the <a href="https://github.com/chronotope/chrono" target="_blank"><code>chrono</code></a> crate to
serialize and deserialize JSON data containing a custom date format. The <code>with</code>
attribute is used to provide the logic for handling the custom representation.</p>
<pre><a class="playground-link" target="_blank" href="https://play.rust-lang.org/?edition=2018&gist=2ef7c347c76b030fe7e8c59ce9efccd3"></a><code class="lang-rust"><span class="hljs-keyword">use</span> chrono::{DateTime, Utc};
<span class="hljs-keyword">use</span> serde::{Serialize, Deserialize};
<span class="hljs-meta">#[derive(Serialize, Deserialize, Debug)]</span>
<span class="hljs-keyword">pub</span> <span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">StructWithCustomDate</span></span> {
<span class="hljs-comment">// DateTime supports Serde out of the box, but uses RFC3339 format. Provide</span>
<span class="hljs-comment">// some custom logic to make it use our desired format.</span>
<span class="hljs-meta">#[serde(with = <span class="hljs-meta-string">"my_date_format"</span>)]</span>
<span class="hljs-keyword">pub</span> timestamp: DateTime<Utc>,
<span class="hljs-comment">// Any other fields in the struct.</span>
<span class="hljs-keyword">pub</span> bidder: <span class="hljs-built_in">String</span>,
}
<span class="hljs-keyword">mod</span> my_date_format {
<span class="hljs-keyword">use</span> chrono::{DateTime, Utc, NaiveDateTime};
<span class="hljs-keyword">use</span> serde::{<span class="hljs-keyword">self</span>, Deserialize, Serializer, Deserializer};
<span class="hljs-keyword">const</span> FORMAT: &<span class="hljs-symbol">'static</span> <span class="hljs-keyword">str</span> = <span class="hljs-string">"%Y-%m-%d %H:%M:%S"</span>;
<span class="hljs-comment">// The signature of a serialize_with function must follow the pattern:</span>
<span class="hljs-comment">//</span>
<span class="hljs-comment">// fn serialize<S>(&T, S) -> Result<S::Ok, S::Error></span>
<span class="hljs-comment">// where</span>
<span class="hljs-comment">// S: Serializer</span>
<span class="hljs-comment">//</span>
<span class="hljs-comment">// although it may also be generic over the input types T.</span>
<span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">serialize</span></span><S>(
date: &DateTime<Utc>,
serializer: S,
) -> <span class="hljs-built_in">Result</span><S::<span class="hljs-literal">Ok</span>, S::Error>
<span class="hljs-keyword">where</span>
S: Serializer,
{
<span class="hljs-keyword">let</span> s = <span class="hljs-built_in">format!</span>(<span class="hljs-string">"{}"</span>, date.format(FORMAT));
serializer.serialize_str(&s)
}
<span class="hljs-comment">// The signature of a deserialize_with function must follow the pattern:</span>
<span class="hljs-comment">//</span>
<span class="hljs-comment">// fn deserialize<'de, D>(D) -> Result<T, D::Error></span>
<span class="hljs-comment">// where</span>
<span class="hljs-comment">// D: Deserializer<'de></span>
<span class="hljs-comment">//</span>
<span class="hljs-comment">// although it may also be generic over the output types T.</span>
<span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">deserialize</span></span><<span class="hljs-symbol">'de</span>, D>(
deserializer: D,
) -> <span class="hljs-built_in">Result</span><DateTime<Utc>, D::Error>
<span class="hljs-keyword">where</span>
D: Deserializer<<span class="hljs-symbol">'de</span>>,
{
<span class="hljs-keyword">let</span> s = <span class="hljs-built_in">String</span>::deserialize(deserializer)?;
<span class="hljs-keyword">let</span> dt = NaiveDateTime::parse_from_str(&s, FORMAT).map_err(serde::de::Error::custom)?;
<span class="hljs-literal">Ok</span>(DateTime::<Utc>::from_naive_utc_and_offset(dt, Utc))
}
}
<span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">main</span></span>() {
<span class="hljs-keyword">let</span> json_str = r#<span class="hljs-string">"
{
"</span>timestamp<span class="hljs-string">": "</span><span class="hljs-number">2017</span>-<span class="hljs-number">02</span>-<span class="hljs-number">16</span> <span class="hljs-number">21</span>:<span class="hljs-number">54</span>:<span class="hljs-number">30</span><span class="hljs-string">",
"</span>bidde<span class="hljs-string">r": "</span>Skrillex<span class="hljs-string">"
}
"</span>#;
<span class="hljs-keyword">let</span> data: StructWithCustomDate = serde_json::from_str(json_str).unwrap();
<span class="hljs-built_in">println!</span>(<span class="hljs-string">"{:#?}"</span>, data);
<span class="hljs-keyword">let</span> serialized = serde_json::to_string_pretty(&data).unwrap();
<span class="hljs-built_in">println!</span>(<span class="hljs-string">"{}"</span>, serialized);
}
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