Answers for "moment object to duration from now"

moment calculate duration

moment
 .duration(moment(endTime, 'YYYY/MM/DD HH:mm')
 .diff(moment(startTime, 'YYYY/MM/DD HH:mm'))
 ).asHours()

Moment.js: Date between dates

You can use one of the moment plugin -> moment-range to deal with date range:

var startDate = new Date(2013, 1, 12)
  , endDate   = new Date(2013, 1, 15)
  , date  = new Date(2013, 2, 15)
  , range = moment().range(startDate, endDate);

range.contains(date); // false