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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">std</span>::{<span class="ident">cmp</span>, <span class="ident">ops</span>};

<span class="kw">use</span> <span class="ident">anyhow::Result</span>;
<span class="kw">use</span> <span class="ident">ordered_float::NotNan</span>;
<span class="kw">use</span> <span class="ident">serde</span>::{<span class="ident">Deserialize</span>, <span class="ident">Serialize</span>};

<span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">deserialize_f64</span>, <span class="ident">serialize_f64</span>, <span class="ident">trim_f64</span>, <span class="ident">Duration</span>};

<span class="doccomment">/// In seconds since midnight. Can&#39;t be negative.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">PartialOrd</span>, <span class="ident">Serialize</span>, <span class="ident">Deserialize</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Time</span>(
    <span class="attribute">#[<span class="ident">serde</span>(<span class="ident">serialize_with</span> <span class="op">=</span> <span class="string">&quot;serialize_f64&quot;</span>, <span class="ident">deserialize_with</span> <span class="op">=</span> <span class="string">&quot;deserialize_f64&quot;</span>)]</span> <span class="ident">f64</span>,
);

<span class="comment">// By construction, Time is a finite f64 with trimmed precision.</span>
<span class="kw">impl</span> <span class="ident">Eq</span> <span class="kw">for</span> <span class="ident">Time</span> {}

<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy::derive_ord_xor_partial_ord</span>)]</span> <span class="comment">// false positive</span>
<span class="kw">impl</span> <span class="ident">Ord</span> <span class="kw">for</span> <span class="ident">Time</span> {
    <span class="kw">fn</span> <span class="ident">cmp</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&amp;</span><span class="ident">Time</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">cmp::Ordering</span> {
        <span class="self">self</span>.<span class="ident">partial_cmp</span>(<span class="ident">other</span>).<span class="ident">unwrap</span>()
    }
}

<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">clippy::derive_hash_xor_eq</span>)]</span> <span class="comment">// false positive</span>
<span class="kw">impl</span> <span class="ident">std::hash::Hash</span> <span class="kw">for</span> <span class="ident">Time</span> {
    <span class="kw">fn</span> <span class="ident">hash</span><span class="op">&lt;</span><span class="ident">H</span>: <span class="ident">std::hash::Hasher</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">state</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">H</span>) {
        <span class="ident">NotNan::new</span>(<span class="self">self</span>.<span class="number">0</span>).<span class="ident">unwrap</span>().<span class="ident">hash</span>(<span class="ident">state</span>);
    }
}

<span class="kw">impl</span> <span class="ident">Time</span> {
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">START_OF_DAY</span>: <span class="ident">Time</span> <span class="op">=</span> <span class="ident">Time</span>(<span class="number">0.0</span>);

    <span class="comment">// No direct public constructors. Explicitly do Time::START_OF_DAY + duration.</span>
    <span class="kw">fn</span> <span class="ident">seconds_since_midnight</span>(<span class="ident">value</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Time</span> {
        <span class="kw">if</span> <span class="op">!</span><span class="ident">value</span>.<span class="ident">is_finite</span>() <span class="op">|</span><span class="op">|</span> <span class="ident">value</span> <span class="op">&lt;</span> <span class="number">0.0</span> {
            <span class="macro">panic!</span>(<span class="string">&quot;Bad Time {}&quot;</span>, <span class="ident">value</span>);
        }

        <span class="ident">Time</span>(<span class="ident">trim_f64</span>(<span class="ident">value</span>))
    }

    <span class="doccomment">/// (hours, minutes, seconds, centiseconds)</span>
    <span class="kw">fn</span> <span class="ident">get_parts</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> (<span class="ident">usize</span>, <span class="ident">usize</span>, <span class="ident">usize</span>, <span class="ident">usize</span>) {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">remainder</span> <span class="op">=</span> <span class="self">self</span>.<span class="number">0</span>;
        <span class="kw">let</span> <span class="ident">hours</span> <span class="op">=</span> (<span class="ident">remainder</span> <span class="op">/</span> <span class="number">3600.0</span>).<span class="ident">floor</span>();
        <span class="ident">remainder</span> <span class="op">-</span><span class="op">=</span> <span class="ident">hours</span> <span class="op">*</span> <span class="number">3600.0</span>;
        <span class="kw">let</span> <span class="ident">minutes</span> <span class="op">=</span> (<span class="ident">remainder</span> <span class="op">/</span> <span class="number">60.0</span>).<span class="ident">floor</span>();
        <span class="ident">remainder</span> <span class="op">-</span><span class="op">=</span> <span class="ident">minutes</span> <span class="op">*</span> <span class="number">60.0</span>;
        <span class="kw">let</span> <span class="ident">seconds</span> <span class="op">=</span> <span class="ident">remainder</span>.<span class="ident">floor</span>();
        <span class="ident">remainder</span> <span class="op">-</span><span class="op">=</span> <span class="ident">seconds</span>;
        <span class="kw">let</span> <span class="ident">centis</span> <span class="op">=</span> (<span class="ident">remainder</span> <span class="op">/</span> <span class="number">0.1</span>).<span class="ident">floor</span>();

        (
            <span class="ident">hours</span> <span class="kw">as</span> <span class="ident">usize</span>,
            <span class="ident">minutes</span> <span class="kw">as</span> <span class="ident">usize</span>,
            <span class="ident">seconds</span> <span class="kw">as</span> <span class="ident">usize</span>,
            <span class="ident">centis</span> <span class="kw">as</span> <span class="ident">usize</span>,
        )
    }
    <span class="doccomment">/// Rounded down. 6:59:00 is hour 6.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_hours</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">usize</span> {
        <span class="self">self</span>.<span class="ident">get_parts</span>().<span class="number">0</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ampm_tostring</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">String</span> {
        <span class="kw">let</span> (<span class="kw-2">mut</span> <span class="ident">hours</span>, <span class="ident">minutes</span>, <span class="ident">seconds</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_parts</span>();
        <span class="kw">let</span> <span class="ident">next_day</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">hours</span> <span class="op">&gt;</span><span class="op">=</span> <span class="number">24</span> {
            <span class="kw">let</span> <span class="ident">days</span> <span class="op">=</span> <span class="ident">hours</span> <span class="op">/</span> <span class="number">24</span>;
            <span class="ident">hours</span> <span class="op">%</span><span class="op">=</span> <span class="number">24</span>;
            <span class="macro">format!</span>(<span class="string">&quot; (+{} days)&quot;</span>, <span class="ident">days</span>)
        } <span class="kw">else</span> {
            <span class="string">&quot;&quot;</span>.<span class="ident">to_string</span>()
        };
        <span class="kw">let</span> <span class="ident">suffix</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">hours</span> <span class="op">&lt;</span> <span class="number">12</span> { <span class="string">&quot;AM&quot;</span> } <span class="kw">else</span> { <span class="string">&quot;PM&quot;</span> };
        <span class="kw">if</span> <span class="ident">hours</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
            <span class="ident">hours</span> <span class="op">=</span> <span class="number">12</span>;
        } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">hours</span> <span class="op">&gt;</span><span class="op">=</span> <span class="number">24</span> {
            <span class="ident">hours</span> <span class="op">-</span><span class="op">=</span> <span class="number">24</span>;
        } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">hours</span> <span class="op">&gt;</span> <span class="number">12</span> {
            <span class="ident">hours</span> <span class="op">-</span><span class="op">=</span> <span class="number">12</span>;
        }

        <span class="macro">format!</span>(
            <span class="string">&quot;{:02}:{:02}:{:02} {}{}&quot;</span>,
            <span class="ident">hours</span>, <span class="ident">minutes</span>, <span class="ident">seconds</span>, <span class="ident">suffix</span>, <span class="ident">next_day</span>
        )
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_filename</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">String</span> {
        <span class="kw">let</span> (<span class="ident">hours</span>, <span class="ident">minutes</span>, <span class="ident">seconds</span>, <span class="ident">remainder</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_parts</span>();
        <span class="macro">format!</span>(
            <span class="string">&quot;{0:02}h{1:02}m{2:02}.{3:01}s&quot;</span>,
            <span class="ident">hours</span>, <span class="ident">minutes</span>, <span class="ident">seconds</span>, <span class="ident">remainder</span>
        )
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">string</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Time</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">parts</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">string</span>.<span class="ident">split</span>(<span class="string">&#39;:&#39;</span>).<span class="ident">collect</span>();
        <span class="kw">if</span> <span class="ident">parts</span>.<span class="ident">is_empty</span>() {
            <span class="macro">bail!</span>(<span class="string">&quot;Time {}: no :&#39;s&quot;</span>, <span class="ident">string</span>);
        }

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">seconds</span> <span class="op">=</span> <span class="ident">parts</span>.<span class="ident">last</span>().<span class="ident">unwrap</span>().<span class="ident">parse</span>::<span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span>()<span class="question-mark">?</span>;
        <span class="kw">match</span> <span class="ident">parts</span>.<span class="ident">len</span>() {
            <span class="number">1</span> <span class="op">=</span><span class="op">&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">Time::seconds_since_midnight</span>(<span class="ident">seconds</span>)),
            <span class="number">2</span> <span class="op">=</span><span class="op">&gt;</span> {
                <span class="comment">// They&#39;re really minutes</span>
                <span class="ident">seconds</span> <span class="kw-2">*</span><span class="op">=</span> <span class="number">60.0</span>;
                <span class="ident">seconds</span> <span class="op">+</span><span class="op">=</span> <span class="number">3600.0</span> <span class="op">*</span> <span class="ident">parts</span>[<span class="number">0</span>].<span class="ident">parse</span>::<span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span>()<span class="question-mark">?</span>;
                <span class="prelude-val">Ok</span>(<span class="ident">Time::seconds_since_midnight</span>(<span class="ident">seconds</span>))
            }
            <span class="number">3</span> <span class="op">=</span><span class="op">&gt;</span> {
                <span class="ident">seconds</span> <span class="op">+</span><span class="op">=</span> <span class="number">60.0</span> <span class="op">*</span> <span class="ident">parts</span>[<span class="number">1</span>].<span class="ident">parse</span>::<span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span>()<span class="question-mark">?</span>;
                <span class="ident">seconds</span> <span class="op">+</span><span class="op">=</span> <span class="number">3600.0</span> <span class="op">*</span> <span class="ident">parts</span>[<span class="number">0</span>].<span class="ident">parse</span>::<span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span>()<span class="question-mark">?</span>;
                <span class="prelude-val">Ok</span>(<span class="ident">Time::seconds_since_midnight</span>(<span class="ident">seconds</span>))
            }
            <span class="kw">_</span> <span class="op">=</span><span class="op">&gt;</span> <span class="macro">bail!</span>(<span class="string">&quot;Time {}: weird number of parts&quot;</span>, <span class="ident">string</span>),
        }
    }

    <span class="comment">// TODO These are a little weird, so don&#39;t operator overload yet</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">percent_of</span>(<span class="self">self</span>, <span class="ident">p</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Time</span> {
        <span class="kw">if</span> <span class="op">!</span>(<span class="number">0.0</span>..<span class="op">=</span><span class="number">1.0</span>).<span class="ident">contains</span>(<span class="kw-2">&amp;</span><span class="ident">p</span>) {
            <span class="macro">panic!</span>(<span class="string">&quot;Bad percent_of input: {}&quot;</span>, <span class="ident">p</span>);
        }
        <span class="ident">Time::seconds_since_midnight</span>(<span class="self">self</span>.<span class="number">0</span> <span class="op">*</span> <span class="ident">p</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_percent</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Time</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">f64</span> {
        <span class="self">self</span>.<span class="number">0</span> <span class="op">/</span> <span class="ident">other</span>.<span class="number">0</span>
    }

    <span class="doccomment">/// For RNG range generation. Don&#39;t abuse.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">inner_seconds</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">f64</span> {
        <span class="self">self</span>.<span class="number">0</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clamped_sub</span>(<span class="self">self</span>, <span class="ident">dt</span>: <span class="ident">Duration</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Time</span> {
        <span class="ident">Time::seconds_since_midnight</span>((<span class="self">self</span>.<span class="number">0</span> <span class="op">-</span> <span class="ident">dt</span>.<span class="ident">inner_seconds</span>()).<span class="ident">max</span>(<span class="number">0.0</span>))
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">round_seconds</span>(<span class="self">self</span>, <span class="ident">s</span>: <span class="ident">f64</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Time</span> {
        <span class="ident">Time::seconds_since_midnight</span>(<span class="ident">s</span> <span class="op">*</span> (<span class="self">self</span>.<span class="number">0</span> <span class="op">/</span> <span class="ident">s</span>).<span class="ident">round</span>())
    }
}

<span class="comment">// 24-hour format by default</span>
<span class="kw">impl</span> <span class="ident">std::fmt::Display</span> <span class="kw">for</span> <span class="ident">Time</span> {
    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">std::fmt::Formatter</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">std::fmt::Result</span> {
        <span class="kw">let</span> (<span class="ident">hours</span>, <span class="ident">minutes</span>, <span class="ident">seconds</span>, <span class="ident">remainder</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">get_parts</span>();
        <span class="macro">write!</span>(
            <span class="ident">f</span>,
            <span class="string">&quot;{0:02}:{1:02}:{2:02}.{3:01}&quot;</span>,
            <span class="ident">hours</span>, <span class="ident">minutes</span>, <span class="ident">seconds</span>, <span class="ident">remainder</span>
        )
    }
}

<span class="kw">impl</span> <span class="ident">ops::Add</span><span class="op">&lt;</span><span class="ident">Duration</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Time</span> {
    <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Time</span>;

    <span class="kw">fn</span> <span class="ident">add</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Duration</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Time</span> {
        <span class="ident">Time::seconds_since_midnight</span>(<span class="self">self</span>.<span class="number">0</span> <span class="op">+</span> <span class="ident">other</span>.<span class="ident">inner_seconds</span>())
    }
}

<span class="kw">impl</span> <span class="ident">ops::AddAssign</span><span class="op">&lt;</span><span class="ident">Duration</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Time</span> {
    <span class="kw">fn</span> <span class="ident">add_assign</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Duration</span>) {
        <span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span> <span class="op">+</span> <span class="ident">other</span>;
    }
}

<span class="kw">impl</span> <span class="ident">ops::Sub</span><span class="op">&lt;</span><span class="ident">Duration</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Time</span> {
    <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Time</span>;

    <span class="kw">fn</span> <span class="ident">sub</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Duration</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Time</span> {
        <span class="ident">Time::seconds_since_midnight</span>(<span class="self">self</span>.<span class="number">0</span> <span class="op">-</span> <span class="ident">other</span>.<span class="ident">inner_seconds</span>())
    }
}

<span class="kw">impl</span> <span class="ident">ops::Sub</span> <span class="kw">for</span> <span class="ident">Time</span> {
    <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Duration</span>;

    <span class="kw">fn</span> <span class="ident">sub</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Time</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Duration</span> {
        <span class="ident">Duration::seconds</span>(<span class="self">self</span>.<span class="number">0</span> <span class="op">-</span> <span class="ident">other</span>.<span class="number">0</span>)
    }
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
    <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">parse</span>() {
        <span class="macro">assert_eq!</span>(
            <span class="ident">Time::START_OF_DAY</span> <span class="op">+</span> <span class="ident">Duration::seconds</span>(<span class="number">42.3</span>),
            <span class="ident">Time::parse</span>(<span class="string">&quot;42.3&quot;</span>).<span class="ident">unwrap</span>()
        );
        <span class="macro">assert_eq!</span>(
            <span class="ident">Time::START_OF_DAY</span> <span class="op">+</span> <span class="ident">Duration::hours</span>(<span class="number">7</span>) <span class="op">+</span> <span class="ident">Duration::minutes</span>(<span class="number">30</span>),
            <span class="ident">Time::parse</span>(<span class="string">&quot;07:30&quot;</span>).<span class="ident">unwrap</span>()
        );
        <span class="macro">assert_eq!</span>(
            <span class="ident">Time::START_OF_DAY</span>
                <span class="op">+</span> <span class="ident">Duration::hours</span>(<span class="number">7</span>)
                <span class="op">+</span> <span class="ident">Duration::minutes</span>(<span class="number">30</span>)
                <span class="op">+</span> <span class="ident">Duration::seconds</span>(<span class="number">5.0</span>),
            <span class="ident">Time::parse</span>(<span class="string">&quot;07:30:05&quot;</span>).<span class="ident">unwrap</span>()
        );
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">get_hours</span>() {
        <span class="macro">assert_eq!</span>((<span class="ident">Time::START_OF_DAY</span> <span class="op">+</span> <span class="ident">Duration::hours</span>(<span class="number">6</span>)).<span class="ident">get_hours</span>(), <span class="number">6</span>);
        <span class="macro">assert_eq!</span>(
            (<span class="ident">Time::START_OF_DAY</span> <span class="op">+</span> <span class="ident">Duration::hours</span>(<span class="number">6</span>) <span class="op">+</span> <span class="ident">Duration::seconds</span>(<span class="number">1.0</span>)).<span class="ident">get_hours</span>(),
            <span class="number">6</span>
        );
        <span class="macro">assert_eq!</span>(
            (<span class="ident">Time::START_OF_DAY</span> <span class="op">+</span> <span class="ident">Duration::hours</span>(<span class="number">6</span>) <span class="op">+</span> <span class="ident">Duration::minutes</span>(<span class="number">59</span>)).<span class="ident">get_hours</span>(),
            <span class="number">6</span>
        );
    }
}
</pre></div>
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