js设置新的日期时间

function getHalfHourDate(){

var nDate = new Date();

var nYear = nDate.getFullYear(),

nMonth = nDate.getMonth(),

nDay = nDate.getDate(),

nHour = nDate.getHours(),

nMinit = nDate.getMinutes(),

nSecond = nDate.getSeconds();

var newDate = new Date(nYear,nMonth,nDay,nHour,nMinit+30,nSecond);

var newYear = newDate.getFullYear(),

newMonth = newDate.getMonth() + 1,

newDay = newDate.getDate(),

newHour = newDate.getHours(),

newMinit = newDate.getMinutes(),

newSecond = newDate.getSeconds(),

dateStr = [];

dateStr[0] = newYear;

newMonth = newMonth < 10 ? "0" + newMonth : newMonth;

dateStr[1] = newMonth;

newDay = newDay < 10 ? "0" + newDay : newDay;

dateStr[2] = newDay;

newHour = newHour < 10 ? "0" + newHour : newHour;

dateStr[3] = newHour;

newMinit = newMinit < 10 ? "0" + newMinit : newMinit;

dateStr[4] = newMinit;

newSecond = newSecond < 10 ? "0" + newSecond : newSecond;

dateStr[5] = newSecond;

var timestamp = dateStr[0]+'-'+dateStr[1]+'-'+dateStr[2]+' '+dateStr[3]+':'+dateStr[4];

return timestamp;

}