function dayexec(str){
		var Date1 = new Date(str.replace('-','/'));
		var Date2 = new Date();
		var Date3 = new Date(Date2.getFullYear(),Date2.getMonth(),Date2.getDate());
		var d=(Date3.getTime()-Date1.getTime())/1000/3600/24;
		//alert(d);
		if (d<=0)
		{
			document.write("<font color=red>今天 "+Date1.toTimeString().substr(0,5)+"</font>");
		}else if(d<=1){
			document.write("<font color=green>昨天 "+Date1.toTimeString().substr(0,5)+"</font>");
		}else if(d<=2){
			document.write("<font color=blue>前天 "+Date1.toTimeString().substr(0,5)+"</font>");
		}else{
			document.write(str);
		}
	}