title: difference in calendar days, solution other than date-fns/moment?
body: <p>Im trying to just get the difference in days between 2 dates ie july 17th and july 19th is a difference of 2 days.  Im currently using the date-fns library and utilizing the differenceInCalendarDays and unfortunately this is inaccurate it returns 1 day difference between july 17th and july19th. Ive created this repl to demonstrate the inaccurate functionality of the method. I've also tried using momentjs and am getting the same result.</p>
  <p>repl - <a href="https://repl.it/@yazmnh87/CumbersomeLightsalmonTheories#index.js" rel="nofollow noreferrer">https://repl.it/@yazmnh87/CumbersomeLightsalmonTheories#index.js</a></p>
  <p>gitHub issue date-fns - <a href="https://github.com/date-fns/date-fns/issues/1877" rel="nofollow noreferrer">https://github.com/date-fns/date-fns/issues/1877</a></p>
  <p>one solution I've thought of is setting the times to noon or something before saving to the DB so I get consistent results.  Any help on how to approach this easily is greatly appreciated.</p>