获取时间的毫秒数

public static void main(String[] args) throws Exception {

 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");//24小时制

//yyyy-MM-dd hh:mm 12小时制，获取的毫秒数会有问题，小错误

 
 String str1 = "2017-11-29 12:31";
 long millionSeconds1 = sdf.parse(str1).getTime();//毫秒
 System.out.println(millionSeconds1);
 
 String str2= "2017-11-29 07:20";
 long millionSeconds2 = sdf.parse(str2).getTime();//毫秒
 System.out.println(millionSeconds2);
 
 String str3 = "2017-11-29 13:00";
 long millionSeconds3 = sdf.parse(str3).getTime();//毫秒
 System.out.println(millionSeconds3);
 
 if(millionSeconds1<=millionSeconds2 && millionSeconds2<millionSeconds3){
 System.out.println("----------"); 
 }
}