el-date-picker默认结束为当前时分秒的操作方法

 :default-time="['00:00:00', new Date().toLocaleTimeString('chinese', { hour12: false })]"

 <el-form-item prop="carDate">
	<el-date-picker
	   v-model="ruleForm.carDate"
	   :picker-options="pickerOptions"
	   type="datetimerange"
	   value-format="yyyy-MM-dd HH:mm:ss"
	   :default-time="['00:00:00', new Date().toLocaleTimeString('chinese', { hour12: false })]"
	   range-separator="至"
	   start-placeholder="开始时间"
	   end-placeholder="结束时间"
	 >
	 </el-date-picker>
	</el-form-item>

   pickerOptions: {
        disabledDate: time => {     
          return time.getTime() > Date.now()
        }
      },

//计算时间跨度是否超过限制天数
    isTimeSpanWithinLimit(startTime, endTime, limitDays) {
      const startDateTime = new Date(startTime)
      const endDateTime = new Date(endTime)
      const timeDifference = endDateTime - startDateTime
      const daysDifference = Math.floor(timeDifference / (1000 * 60 * 60 * 24))
      return daysDifference <= limitDays
    }