number-of-elapsed-seconds-between-two-times

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Algorithms

You are given two valid times <code>startTime</code> and <code>endTime</code>, each represented as a string in the format <code>&quot;HH:MM:SS&quot;</code>.

Return the number of seconds that have elapsed from <code>startTime</code> to <code>endTime</code>.

&nbsp;
Example 1:

<div class="example-block">
Input: startTime = &quot;01:00:00&quot;, endTime = &quot;01:00:25&quot;

Output: 25

Explanation:
<code>endTime</code> is 25 seconds ahead of <code>startTime</code>.</div>

Example 2:

<div class="example-block">
Input: startTime = &quot;12:34:56&quot;, endTime = &quot;13:00:00&quot;

Output: 1504

Explanation:

<code>endTime</code> is 25 minutes and 4 seconds ahead of <code>startTime</code>, which equals 1504 seconds.
</div>

&nbsp;
Constraints:

<ul>
	<li><code>startTime.length == 8</code></li>
	<li><code>endTime.length == 8</code></li>
	<li><code>startTime</code> and <code>endTime</code> are valid times in the format <code>&quot;HH:MM:SS&quot;</code></li>
	<li><code>00 &lt;= HH &lt;= 23</code></li>
	<li><code>00 &lt;= MM &lt;= 59</code></li>
	<li><code>00 &lt;= SS &lt;= 59</code></li>
	<li><code>endTime</code> is not earlier than <code>startTime</code></li>
</ul>