export function getDefaultTime(value = 'Y-M-D') {
    return new Promise((resolve, reject) => {
        let nowTime = new Date();
        let year = nowTime.getFullYear();
        let month = nowTime.getMonth() + 1;
        let nowDay = nowTime.getDate();
        let [isYear, isMonth, isDay] = [value.indexOf('Y') > -1, value.indexOf('M') > -1, value.indexOf('D') > -1];
        let date1 = `${isYear ? year : ' '}-${isMonth ? month : ' '}-${isDay ? '01' : ''}`.replace(/[-\s]{2}/, '').replace(/((^\s+-)|(\s+-$)|(-$))/, '');
        let date2 = `${isYear ? year : ' '}-${isMonth ? month : ' '}-${isDay ? nowDay : ''}`.replace(/[-\s]{2}/, '').replace(/((^\s+-)|(\s+-$)|(-$))/, '');

        let hour = nowTime.getHours();
        let minute = nowTime.getMinutes();
        let second = nowTime.getSeconds();

        let [isHour, isMinute, isSecond] = [value.indexOf('h') > -1, value.indexOf('m') > -1, value.indexOf('s') > -1];
        let dateTs = `${isHour ? '00' : ' '}:${isMinute ? '00' : ' '}:${isSecond ? '00' : ''}`.replace(/[:\s]{2}/, '').replace(/((^\s+:)|(\s+:$))/, '');
        let dateTe = `${isHour ? hour : ' '}:${isMinute ? minute : ' '}:${isSecond ? second : ''}`.replace(/[:\s]{2}/, '').replace(/((^\s+:)|(\s+:$))/, '');

        let dateS = date1 + (dateTs && date1 ? ' ' + dateTs : dateTs);
        let dateE = date2 + (dateTe && date2 ? ' ' + dateTe : dateTe);

        if (dateS && dateE) {
            resolve({
                start: dateS,
                end: dateE
            })
        } else {
            reject({
                start: '0000-10-17',
                end: '9999-10-17'
            })
        }
    })
}

获取默认时间（单日期）

    export function getSingleDate() {
        return new Promise((resolve, reject) => {
            let nowTime = new Date();
            let year = nowTime.getFullYear();
            let month = nowTime.getMonth() + 1;
            let nowDay = nowTime.getDate();
            // let date1 = year + '-' + month + '-' + '01';
            let dates = year + '-' + month + '-' + nowDay;
    
            if (dates) {
                resolve({
                    date: dates,
                })
            } else {
                reject({
                    date: 9999-10-17,
                })
            }
        })
    }

转换日期格式

Date.prototype.format= function(format) {
    var o = {
        "M+" : this.getMonth()+1, //month
        "d+" : this.getDate(),    //day
        "h+" : this.getHours(),   //hour
        "m+" : this.getMinutes(), //minute
        "s+" : this.getSeconds(), //second
        "q+" : Math.floor((this.getMonth()+3)/3),  //quarter
        "S" : this.getMilliseconds() //millisecond
    }
    if(/(y+)/.test(format))  format=format.replace(RegExp.$1,
        (this.getFullYear()+"").substr(4 - RegExp.$1.length));
    for(var k in o)if(new RegExp("("+ k +")").test(format))
        format = format.replace(RegExp.$1,
            RegExp.$1.length==1 ? o[k] :
                ("00"+ o[k]).substr((""+ o[k]).length));
    return format;
};

获取当月的下一个月时间（包含年份）

        export function getNextTime() {

    return new Promise((resolve, reject) => {

        let nowTime = new Date();
        let year = nowTime.getFullYear();
        let month = nowTime.getMonth() + 2 > 12 ? 1 : nowTime.getMonth() + 2;
        let date1 = new Date(year, month-1, 1).format('yyyy-MM-dd');
        let date2 = new Date(year, month, 0).format('yyyy-MM-dd');

        if (date1 && date2) {
            resolve({
                start: date1,
                end: date2
            })
        } else {
            reject({
                start: '0000-10-17',
                end: '9999-10-17'
            })
        }
    })
}

获取当月的下一个月份

    export function getNextMonth() {

        return new Promise((resolve, reject) => {
            let nowTime = new Date();
            let year = nowTime.getFullYear();
            let month = nowTime.getMonth() + 2 > 12 ? 1 : nowTime.getMonth() + 2;
            let date1 = new Date(year, month-1, 1).format('MM-dd');
            let date2 = new Date(year, month, 0).format('MM-dd');
    
    
            if (date1 && date2) {
                resolve({
                    start: date1,
                    end: date2
                })
            } else {
                reject({
                    start: '10-17',
                    end: '10-17'
                })
            }
        })
    }

获取默认月份

export function getDefaultMonth() {
return new Promise((resolve, reject) => {
    let nowTime = new Date();
    let year = nowTime.getFullYear();
    let month = nowTime.getMonth() + 1;
    let currentMonth = year + '-' + month;

    if(currentMonth){
        resolve({
            month: currentMonth
        })
    }else {
        reject({
            month: '0000-10'
        })
    }
})

}

计算天数

export function getDays() {
    let s1 = '2016-05-12';
    let s2 = '2016-05-12';
    s1 = new Date(s1.replace(/-/g, "/"));
    s2 = new Date(s2.replace(/-/g, "/"));
    let days = s2.getTime() - s1.getTime();
    let time = parseInt(days / (1000 * 60 * 60 * 24));
}

获取指定时间

• params

• type: 类型 默认 aftertime ; val N个月后的日期

      export function getAppointDate(val, num = 3, type = 'aftertime') {
      let backVal;
      switch (type) {
          case 'aftertime':
              let month = val.match(/-\d{1,2}/)[0];
              let inx = val.search(/-\d{1,2}/);
              month *= -1;
              let totalMonth = month + num;
              let addYear = Math.floor((month + num) / 12);
              let intCountDate = totalMonth % 12 || totalMonth;
  
              let countDate = totalMonth <= 12 ? `${val.substring(0, inx)}-${intCountDate}` : `${val.substring(0, inx) * 1 + addYear}-${intCountDate}`;
              let is31Day = [1, 3, 5, 7, 8, 10, 12];
              let is30Day = [4, 6, 9, 11];
  
              let day = val.match(/-\d{1,2}$/)[0] * - 1;
  
              if (is31Day.indexOf(intCountDate) > -1) {
                  day = day > 31 ? 31 : day;
              } else if (is30Day.indexOf(intCountDate) > -1) {
                  day = day > 30 ? 30 : day;
              } else {
                  if (val.substring(0, 3) % 4 === 0) {
                      day = day > 29 ? 29 : day;
                  } else {
                      day = day > 28 ? 28 : day;
                  }
              }
              backVal = countDate + '-' + day;
              break;
      }
      return backVal;
      }