js获取当前月的第一天和最后一天

js获取当前月的第一天和最后一天:

function getFirstAndLastMonthDay( year, month){  
               var   firstdate = year + '-' + month + '-01';
               var  day = new Date(year,month,0); 
               var lastdate = year + '-' + month + '-' + day.getDate();//获取当月最后一天日期  
  //给文本控件赋值。同下
               return lastdate;
            }

js将String类型转换为Date类型：

function string2Date(aStringDate){
   var datepattern=/^((\d{2}(([02468][048])|([13579][26]))\-((((0[13578])|(1[02]))\-((0[1-9])|([1-2][0-9])|(3[01])))|(((0[469])|(11))\-((0[1-9])|([1-2][0-9])|(30)))|(02\-((0[1-9])|([1-2][0-9])))))|(\d{2}(([02468][1235679])|([13579][01345789]))\-((((0[13578])|(1[02]))\-((0[1-9])|([1-2][0-9])|(3[01])))|(((0[469])|(11))\-((0[1-9])|([1-2][0-9])|(30)))|(02\-((0[1-9])|(1[0-9])|(2[0-8]))))))(\s(((0[0-9])|(1[0-9])|(2[0-3]))\:([0-5][0-9])))$/;
	 if(!datepattern.exec(aStringDate)){
	 	alert("非法日期格式！");
	 	return;
	 	}
	 var year=Number(aStringDate.substring(0,4));
	 var month=Number(aStringDate.substring(5,7));
	 month--;
	 var mydate=Number(aStringDate.substring(8,10));
	 var hour=Number(aStringDate.substring(11,13));
	 var minute=Number(aStringDate.substring(14,16));

	 return new Date(year,month,mydate,hour,minute);	
}

js将Date类型转换为String类型：

function date2String(aDate){
  var year=aDate.getYear();
	var month=aDate.getMonth();
	month++;
	var mydate=aDate.getDate();
	var hour=aDate.getHours();
	var minute=aDate.getMinutes();
	var mytime=year+"-"+(month<10?"0":"")+month+"-"+(mydate<10?"0":"")+mydate+" "+(hour<10?"0":"")+hour+":"+(minute<10?"0":"")+minute;  
  return mytime;
}