确定当天的开始和结束时间（UTC）（JAVASCRIPT）

我试图以UTC确定当天的开始和结束时间

目前这是我的解决方案`

var starttime = date.getTime() -(date.getHours() * 3600000 ); //subtracting a hours to go back to start time of the day.
var endtime = low + 86400000; //adding 24 hours to the start time 
   `

---

感谢您的帮助！谢谢大家

谢谢大家。这对我来说很有用！！：）

重复问题：

 var d = new Date();
 var year = d.getUTCFullYear();
 var month = d.getUTCMonth();
 var day = d.getUTCDate();

 var startHour =Date.UTC(year,month,day,0,0,0,0);
 var endHour = startHour + 86400000;