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<p>Write a program to count the number of days between two dates.</p>
<p>The two dates are given as strings, their format is <code>YYYY-MM-DD</code>&nbsp;as shown in the examples.</p>
<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>
<pre><strong>Input:</strong> date1 = "2019-06-29", date2 = "2019-06-30"
<strong>Output:</strong> 1
</pre><p><strong>Example 2:</strong></p>
<pre><strong>Input:</strong> date1 = "2020-01-15", date2 = "2019-12-31"
<strong>Output:</strong> 15
</pre>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>
<ul>
<li>The given dates are valid&nbsp;dates between the years <code>1971</code> and <code>2100</code>.</li>
</ul>