1var date1 = new Date('December 25, 2017 01:30:00');
2var date2 = new Date('June 18, 2016 02:30:00');
3
4//best to use .getTime() to compare dates
5if(date1.getTime() === date2.getTime()){
6    //same date
7}
8
9if(date1.getTime() > date2.getTime()){
10    //date 1 is newer
11}

1var d1 = Date.parse("2012-11-01");
2var d2 = Date.parse("2012-11-04");
3if (d1 < d2) {
4    alert ("Error!");
5}

1// solution is convert date to time by getTime()
2start 		= startDate.getTime();
3end 		= endDate.getTime();
4current 	= date.getTime();
5
6if (start <= current && current <= end) {
7  // do something here
8}