Konwersja czasu do liczby sekund w Excelu

Times are stored internally by Excel as fractions of a 24-hour day, so that 12:00:00 would be stored as 0.5 and 18:00:00 as 0.75. Consequently, to convert a time to seconds, you must multiply by the number of seconds in a day - it is easier to remember this as *24*60*60 rather than the actual number (86400). ¹