title: Get number of days between two dates using alternate day as a variable
body: <p>I have an excel userform that contains four text boxes: <code>start date</code>, <code>end date</code>, <code>Alternate Day number</code> &amp; <code>result</code>.</p>
  <p>A user enters a starting and ending date. For example <code>Start Date: 01/oct/2020</code> and <code>End Date: 04/jan/2021</code>.</p>
  <p>In the <code>Alternate Day number</code> text box, the user enters an alternate day number, say <code>4</code>. This represents that an action begins on every <code>4th</code> day.</p>
  <p>How could I code it so that VBA can work out the total number of alternate days between the two dates?</p>