function DateAdd(strInterval, NumDay, dtDate) {
	var dtTmp = new Date(dtDate);
	if (isNaN(dtTmp))
		dtTmp = new Date();
	switch (strInterval) {
	case "s":
		dtTmp = new Date(Date.parse(dtTmp) + (1000 * NumDay));
		break;
	case "n":
		dtTmp = new Date(Date.parse(dtTmp) + (60000 * NumDay));
		break;
	case "h":
		dtTmp = new Date(Date.parse(dtTmp) + (3600000 * NumDay));
		break;
	case "d":
		dtTmp = new Date(Date.parse(dtTmp) + (86400000 * NumDay));
		break;
	case "w":
		dtTmp = new Date(Date.parse(dtTmp) + ((86400000 * 7) * NumDay));
		break;
	case "m":
		dtTmp = new Date(dtTmp.getFullYear(), (dtTmp.getMonth()) + NumDay,
				dtTmp.getDate(), dtTmp.getHours(), dtTmp.getMinutes(), dtTmp
						.getSeconds());
		break;
	case "y":
		dtTmp = new Date((dtTmp.getFullYear() + NumDay), dtTmp.getMonth(),
				dtTmp.getDate(), dtTmp.getHours(), dtTmp.getMinutes(), dtTmp
						.getSeconds());
		break;
	}
	var mStr = new String(dtTmp.getMonth() + 1);
	var dStr = new String(dtTmp.getDate());
	if (mStr.length == 1) {
		mStr = "0" + mStr;
	}
	if (dStr.length == 1) {
		dStr = "0" + dStr;
	}
	return dtTmp.getFullYear() + "-" + mStr + "-" + dStr;
}
function getendday(periodValidity) {
	var str = document.getElementById("selectTimeInput").value;
	var t = periodValidity;
	var temp = DateAdd("d", t - 1, str.replace("-", "/").replace("-", "/"));
	var date = str + " 00:00 至 " + temp + " 23:59";
	document.getElementById("endtime").innerHTML = date;
}