js一些获取日期季度的方法

// 获取指定月份的最后一天
    lastDayOfMonth(date = new Date()) {
      const year = date.getFullYear();
      const month = date.getMonth() + 1; // 月份从0开始计算，需要加1
      const lastDay = new Date(year, month, 0).getDate();
      return lastDay;
    },

    // 根据季度获取季度第一天和最后一天
    getQuarterStartEndDates(year, quarter) {
      const startMonth = (quarter - 1) * 3 + 1;
      const endMonth = startMonth + 2;
      const startDate = new Date(year, startMonth - 1, 1);
      const endDate = new Date(year, endMonth, 0);
      return {
        start: moment(startDate).format('YYYY-MM-DD'),
        end: moment(endDate).format('YYYY-MM-DD'),
      };
    },

    // 判断第几季度
    judementQuarter() {
      const currentMonth = new Date().getMonth() + 1;
      const currentQuarter =
        currentMonth <= 3 ? 1 : currentMonth <= 6 ? 2 : currentMonth <= 9 ? 3 : 4;
      return currentQuarter;
    },