Subtract the two Date
objects and divide by the number of milliseconds in an hour to get the difference (in hours) between them.
const getHoursDiffBetweenDates = (dateInitial, dateFinal) =>
(dateFinal - dateInitial) / (1000 * 3600);
// EXAMPLE
getHoursDiffBetweenDates(
new Date('2021-04-24 10:25:00'),
new Date('2021-04-25 10:25:00')
); // 24
Source
https://www.30secondsofcode.org/js/s/get-hours-diff-between-dates