Compare las fechas en JS
var date1 = new Date('December 25, 2017 01:30:00');
var date2 = new Date('June 18, 2016 02:30:00');
//best to use .getTime() to compare dates
if(date1.getTime() === date2.getTime()){
//same date
}
if(date1.getTime() > date2.getTime()){
//date 1 is newer
}
Grepper