js 得到当前时间

<SCRIPT LANGUAGE="JavaScript">
<!--
var myDate = new Date();
  myDate.getYear(); //获取当前年份(2位)
  myDate.getFullYear(); //获取完整的年份(4位,1970-????)
  myDate.getMonth(); //获取当前月份(0-11,0代表1月)
  myDate.getDate(); //获取当前日(1-31)
  myDate.getDay(); //获取当前星期X(0-6,0代表星期天)
  myDate.getTime(); //获取当前时间(从1970.1.1开始的毫秒数)
  myDate.getHours(); //获取当前小时数(0-23)
  myDate.getMinutes(); //获取当前分钟数(0-59)
  myDate.getSeconds(); //获取当前秒数(0-59)
  myDate.getMilliseconds(); //获取当前毫秒数(0-999)
  myDate.toLocaleDateString(); //获取当前日期
  var mytime=myDate.toLocaleTimeString(); //获取当前时间
  myDate.toLocaleString( ); //获取日期与时间

if (mytime<"23:30:00")
{
alert(mytime);
}
//-->

</SCRIPT>

today = new Date();

  var todayStr = today.getYear() + "-";
  if(today.getMonth()<10){
  todayStr=todayStr+"0"+today.getMonth();
  }
  else{
  todayStr=todayStr+today.getMonth();
  }
   
  if(today.getDay()<10){
  todayStr=todayStr+"-0"+today.getDay();
  }
  else{
  todayStr=todayStr+today.getDay();
  }
  todayStr = todayStr +" "
   
  if(today.getHours()<10){
  todayStr=todayStr+today.getHours();
  }
  else{
  todayStr=todayStr+today.getHours();
  }

  if(today.getMinutes()<10){
  todayStr=todayStr+":0"+today.getMinutes();
  }
  else{
  todayStr=todayStr+":"+today.getMinutes();
  }
  todayStr = todayStr + ":00";