问如何从提醒时间查找前一小时和后一小时

EN

var countDownDate = new Date($('#end_time').val()).getTime();
 var countStartDate = new Date($('#start_time').val()).getTime();
var now = new Date().getTime();
var dsr = <?=$todo['dsr']?>;
if(dsr.length> 0){
let dsr_str ='<ul>';
$.each(dsr, function(index, item){
 let now = new moment(item['reminder_date']);
 var start_distance = countStartDate - now;
if(start_distance < 0){
var distance = countDownDate - now;
 dsr_str += '<li>'+item['company']+' | '+item['phone']+' | <b>'+now.format("hh:mm A")+'</b></li>';});
 dsr_str +='</ul>'
 $(document).Toasts('create', {
 title: 'DSR Reminder',
 class: 'bg-success', 
  body: dsr_str
  })
  }
 if (distance < 0) {
 clearInterval(x);
 location.reload(true);
  }
}
}, 1000); 
  
});