当月获取最后一天&&上个月日期

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  <script>  
	//获取当月最后一天日期 
	function getLastDay(year,month)   
	{   
	 var new_year = year;    //取当前的年份   
	 var new_month = month++;//取下一个月的第一天,方便计算(最后一天不固定)   
	 if(month>12)            //如果当前大于12月,则年份转到下一年   
	 {   
	  new_month -=12;        //月份减   
	  new_year++;            //年份增   
	 }   
	 var new_date = new Date(new_year,new_month,1);                //取当年当月中的第一天   
	 alert(new_date.getTime());
	 return (new Date(new_date.getTime()-1000*60*60*24)).getDate();//获取当月最后一天日期   

	}
	//获取当前月日期起始
	var date = new Date();
	year = date.getYear();
	month = date.getMonth()+1;
	//获取当前月上月日期
	date.setMonth(date.getMonth()-1); 
	lastDateOfYear = date.getYear();
	lastDateOfMonth = date.getMonth()+1;

	alert(year+"-"+month+"-"+getLastDay(year,month));
	alert(lastDateOfYear+"-"+lastDateOfMonth+"-"+"1");
	</script>
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转载自lncdzh.iteye.com/blog/2299751