element-ui日期选择器禁止选择时间disabledDate

<el-date-picker
   v-model="this.submitForm.begin_time"
   type="datetime"
   :picker-options="startDatePicker"
   value-format="yyyy-MM-dd HH:mm:ss"
   placeholder="选择开始时间">
</el-date-picker>

<el-date-picker
   v-model="this.submitForm.end_time"
   type="datetime"
   :picker-options="endDatePicker"
   value-format="yyyy-MM-dd HH:mm:ss"
   default-time="23:59:59"
   placeholder="选择结束时间">
</el-date-picker>

data(){
  return {
    submitForm: {},
    startDatePicker: this.beginDate(),
    endDatePicker: this.processDate()
  }
},
methods:{
 beginDate() {
      return {
        disabledDate(time) {
          return time.getTime() < Date.now() - 86400000;
        }
      };
    },
    processDate() {
      return {
        disabledDate: time => {
          if (this.submitForm.begin_time) {
            return (
              new Date(this.submitForm.begin_time).getTime() > time.getTime()
            );
          } else {
            return time.getTime() < Date.now() - 86400000;
          }
        }
      };
   },
}