https://eriksvensen.wordpress.com/2020/01/15/quick-powerquery-trick-get-duration-days-between-two-dates/
is good.
@Chalfie started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
https://eriksvensen.wordpress.com/2020/01/15/quick-powerquery-trick-get-duration-days-between-two-dates/
is good.