Number of Days Between Two Dates LeetCode solution in JavaScript

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var daysBetweenDates = function (date1, date2) {
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  let miliSecondInaDay = 24 * 60 * 60 * 1000;
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  if (date1 > date2)
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    return (new Date(date1) - new Date(date2)) / miliSecondInaDay;
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  else return (new Date(date2) - new Date(date1)) / miliSecondInaDay;
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};