1、取得当前时间

function getNowFormatDate() {
    var date = new Date();
    var seperator1 = "-";
    var seperator2 = ":";
    var month = date.getMonth() + 1;
    var strDate = date.getDate();
    var hours = date.getHours();
    var minutes = date.getMinutes();
    var seconds = date.getSeconds();
    if (month >= 1 && month <= 9) {
        month = "0" + month;
    }
    if (strDate >= 0 && strDate <= 9) {
        strDate = "0" + strDate;
    }
    if (hours >= 0 && hours <= 9) {
        hours = "0" + hours;
    }
    if (minutes >= 0 && minutes <= 9) {
        minutes = "0" + minutes;
    }
    if (seconds >= 0 && seconds <= 9) {
        seconds = "0" + seconds;
    }
    var currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate
        + " " + hours + seperator2 + minutes + seperator2 + seconds;
    return currentdate;
}

2、取得减30分钟时间

function getNowFormatDate() {
    var date = new Date();
    date.setMinutes(date.getMinutes()-30); //当前时间减30分钟
    var seperator1 = "-";
    var seperator2 = ":";
    var month = date.getMonth() + 1;
    var strDate = date.getDate();
    var hours = date.getHours();
    var minutes = date.getMinutes();
    var seconds = date.getSeconds();
    if (month >= 1 && month <= 9) {
        month = "0" + month;
    }
    if (strDate >= 0 && strDate <= 9) {
        strDate = "0" + strDate;
    }
    if (hours >= 0 && hours <= 9) {
        hours = "0" + hours;
    }
    if (minutes >= 0 && minutes <= 9) {
        minutes = "0" + minutes;
    }
    if (seconds >= 0 && seconds <= 9) {
        seconds = "0" + seconds;
    }
    var currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate
        + " " + hours + seperator2 + minutes + seperator2 + seconds;
    return currentdate;
}
3、各种时间操作

var now = new Date();
   var year = now.getFullYear(); //年
   var month = now.getMonth() + 1; //月
   var day = now.getDate(); //日
   var hour = now.getHours(); //时
   var minute = now.getMinutes(); //分
   var second = now.getSeconds(); //秒