moment datetime between two hours code example

Example 1: momentjs number of days between two dates

var given = moment("2018-03-10", "YYYY-MM-DD");
var current = moment().startOf('day');

//Difference in number of days
moment.duration(given.diff(current)).asDays();

Example 2: calculate time difference in hrs moment

var duration = moment.duration(end.diff(startTime));
var hours = duration.asHours();