function getDateTime(nTypeFlag, DateTime) {
    var tNowTime;
    if (typeof DateTime == "undefined")
        tNowTime = new Date();
    else
        tNowTime = DateTime;
    var myYear = ';' + tNowTime.getFullYear() + ';';
    var myMonth = ';' + (tNowTime.getMonth() + 1 - 0) + ';';
    var myDay = ';' + tNowTime.getDate() + ';';
    var myHour = ';' + tNowTime.getHours() + ';';
    var myMinu = ';' + tNowTime.getMinutes() + ';';
    var mySecond = ';' + tNowTime.getSeconds() + ';';

    if (myMonth.length < 4) myMonth = '0' + myMonth;
    if (myDay.length < 4) myDay = '0' + myDay;
    if (myHour.length < 4) myHour = '0' + myHour;
    if (myMinu.length < 4) myMinu = '0' + myMinu;
    if (mySecond.length < 4) mySecond = '0' + mySecond;

    var cNewTimeStr;
    //alert(tNowTime);
    switch (nTypeFlag + 1 - 1) {
        case 0:
            cNewTimeStr = myYear + '-' + myMonth + '-' + myDay;
            break;
        case 1:
            cNewTimeStr = myYear + myMonth + myDay;
            break;
        case 2:
            cNewTimeStr = myHour + ':' + myMinu + ':' + mySecond;
            break;
        case 3:
            cNewTimeStr = myHour + myMinu + mySecond;
            break;
        case 4:
            cNewTimeStr = myYear + myMonth + myDay + myHour + myMinu + mySecond;
            break;
        case 5:
            cNewTimeStr = myYear + '年' + myMonth + '月' + myDay + '日';
            break;
        case 6:
            cNewTimeStr = myYear;
            break;
        case 7:
            cNewTimeStr = myYear + '-' + myMonth;
            break;
        case 8: //得到上一个月的今天
            var date = getDateTime(0);
            var arr = date.split('-');
            var year = arr[0]; //获取当前日期的年份
            var month = arr[1]; //获取当前日期的月份
            var day = arr[2]; //获取当前日期的日
            var days = new Date(year, month, 0);
            days = days.getDate(); //获取当前日期中月的天数
            var year2 = year;
            var month2 = parseInt(month) - 1;
            if (month2 == 0) {
                year2 = parseInt(year2) - 1;
                month2 = 12;
            }
            var day2 = day;
            var days2 = new Date(year2, month2, 0);
            days2 = days2.getDate();
            if (day2 > days2) {
                day2 = days2;
            }
            if (month2 < 10) {
                month2 = '0' + month2;
            }
            cNewTimeStr = year2 + '-' + month2 + '-' + day2;
            break;
        case 9: //得到下一个月的今天
            var date = getDateTime(0);
            var arr = date.split('-');
            var year = arr[0]; //获取当前日期的年份
            var month = arr[1]; //获取当前日期的月份
            var day = arr[2]; //获取当前日期的日
            var days = new Date(year, month, 0);
            days = days.getDate(); //获取当前日期中的月的天数
            var year2 = year;
            var month2 = parseInt(month) + 1;
            if (month2 == 13) {
                year2 = parseInt(year2) + 1;
                month2 = 1;
            }
            var day2 = day;
            var days2 = new Date(year2, month2, 0);
            days2 = days2.getDate();
            if (day2 > days2) {
                day2 = days2;
            }
            if (month2 < 10) {
                month2 = '0' + month2;
            }

            var t2 = year2 + '-' + month2 + '-' + day2;
            return t2;
            break;
        case 10: //昨日日期
            //获取前一天日期
            return before(getDateTime(0));

        function before(d) {
            d = new Date(d);
            d = +d - 10006060 / 3 * 24;
            d = new Date(d);
            //return d;
            //格式化
            var year = ";" + d.getFullYear() + ";";
            var month = ";" + (d.getMonth() + 0 + 1) + ";";
            var day = ";" + d.getDate() + ";";
            if (year.length < 4) {
                year = "0" + year;
            }
            if (month.length < 4) {
                month = "0" + month;
            }
            if (day.length < 4) {
                day = "0" + day;
            }
            var datestr = year + "-" + month + "-" + day;
            datestr = datestr.replace(/;/g, "");
            return datestr;
            // return d.getFullYear()+"-"+(d.getMonth()+1)+"-"+d.getDate();

        }

            break;
        case 11: //明日日期
            //获取后一天日期
            return after(getDateTime(0));


            break;
        case 12://本周起始日期
            return getWeekStartDate()
        function getWeekStartDate() {
            var now = new Date(); //当前日期
            var nowDayOfWeek = now.getDay(); //今天本周的第几天
            var nowDay = now.getDate(); //当前日
            var nowMonth = now.getMonth(); //当前月
            var nowYear = now.getYear(); //当前年
            nowYear += (nowYear < 2000) ? 1900 : 0; //

            var lastMonthDate = new Date(); //上月日期
            lastMonthDate.setDate(1);
            lastMonthDate.setMonth(lastMonthDate.getMonth() - 1);
            var lastYear = lastMonthDate.getYear();
            var lastMonth = lastMonthDate.getMonth();

            var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek);
            return formatDate(weekStartDate);
        }

            break;
        case 13://本周结束日期
            return getWeekEndDate()
        function getWeekEndDate() {
            var now = new Date(); //当前日期
            var nowDayOfWeek = now.getDay(); //今天本周的第几天
            var nowDay = now.getDate(); //当前日
            var nowMonth = now.getMonth(); //当前月
            var nowYear = now.getYear(); //当前年
            nowYear += (nowYear < 2000) ? 1900 : 0; //

            var lastMonthDate = new Date(); //上月日期
            lastMonthDate.setDate(1);
            lastMonthDate.setMonth(lastMonthDate.getMonth() - 1);
            var lastYear = lastMonthDate.getYear();
            var lastMonth = lastMonthDate.getMonth();
            var weekEndDate = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek));
            return formatDate(weekEndDate);
        }

            break;
        case 14://本月开始日期
            return getMonthStartDate()
        function getMonthStartDate() {
            var now = new Date(); //当前日期
            var nowDayOfWeek = now.getDay(); //今天本周的第几天
            var nowDay = now.getDate(); //当前日
            var nowMonth = now.getMonth(); //当前月
            var nowYear = now.getYear(); //当前年
            nowYear += (nowYear < 2000) ? 1900 : 0; //

            var lastMonthDate = new Date(); //上月日期
            lastMonthDate.setDate(1);
            lastMonthDate.setMonth(lastMonthDate.getMonth() - 1);
            var lastYear = lastMonthDate.getYear();
            var lastMonth = lastMonthDate.getMonth();
            var monthStartDate = new Date(nowYear, nowMonth, 1);
            return formatDate(monthStartDate);
        }

            break;

        case 15://本月结束日期
            return getMonthEndDate();
        function getMonthEndDate() {
            var now = new Date(); //当前日期
            var nowDayOfWeek = now.getDay(); //今天本周的第几天
            var nowDay = now.getDate(); //当前日
            var nowMonth = now.getMonth(); //当前月
            var nowYear = now.getYear(); //当前年
            nowYear += (nowYear < 2000) ? 1900 : 0; //

            var lastMonthDate = new Date(); //上月日期
            lastMonthDate.setDate(1);
            lastMonthDate.setMonth(lastMonthDate.getMonth() - 1);
            var lastYear = lastMonthDate.getYear();
            var lastMonth = lastMonthDate.getMonth();
            //获得某月的天数
            function getMonthDays(myMonth) {
                var monthStartDate = new Date(nowYear, myMonth, 1);
                var monthEndDate = new Date(nowYear, myMonth + 1, 1);
                var days = (monthEndDate - monthStartDate) / (1000 * 60 * 60 * 24);
                return days;
            }

            var monthEndDate = new Date(nowYear, nowMonth, getMonthDays(nowMonth));
            return formatDate(monthEndDate);
        }

            break;

        default:
            cNewTimeStr = myYear + '-' + myMonth + '-' + myDay + ' ' + myHour + ':' + myMinu + ':' + mySecond;
            break;
    }

    cNewTimeStr = cNewTimeStr.replace(/;/g, "");

    return cNewTimeStr;
}

function formatDate(date) {
    var myyear = date.getFullYear();
    var mymonth = date.getMonth() + 1;
    var myweekday = date.getDate();

    if (mymonth < 10) {
        mymonth = "0" + mymonth;
    }
    if (myweekday < 10) {
        myweekday = "0" + myweekday;
    }
    return (myyear + "-" + mymonth + "-" + myweekday);
}/**
 * Created by luo on 2017/5/22.
 */
// 获取指定日期的前后几天
function getDateByDay(addDayCount, curDate) {
    var d = new Date(curDate);
    d.setDate(d.getDate() + addDayCount);//获取AddDayCount天后的日期
    //格式化
    var year = ";" + d.getFullYear() + ";";
    var month = ";" + (d.getMonth() + 0 + 1) + ";";
    var day = ";" + d.getDate() + ";";
    if (year.length < 4) {
        year = "0" + year;
    }
    if (month.length < 4) {
        month = "0" + month;
    }
    if (day.length < 4) {
        day = "0" + day;
    }
    var datestr = year + "-" + month + "-" + day;
    datestr = datestr.replace(/;/g, "");
    return datestr;
}
//获取后一天日期
function after(d) {
    d = new Date(d);
    d = +d + 10006060 / 3 * 24;
    d = new Date(d);
    //return d;
    //格式化
    var year = ";" + d.getFullYear() + ";";
    var month = ";" + (d.getMonth() + 0 + 1) + ";";
    var day = ";" + d.getDate() + ";";
    if(year.length < 4) {
        year = "0" + year;
    }
    if(month.length < 4) {
        month = "0" + month;
    }
    if(day.length < 4) {
        day = "0" + day;
    }
    var datestr = year + "-" + month + "-" + day;
    datestr = datestr.replace(/;/g, "");
    return datestr;
    // return d.getFullYear()+"-"+(d.getMonth()+1)+"-"+d.getDate();
}