Warning: [antdv: DatePicker] `value` provides invalidate moment time. If you want to set empty value

vue-ant使用a-date-picker元件報錯：

Warning: [antdv: DatePicker] `value` provides invalidate moment time. If you want to set empty value, use `null` instead.

<a-form
    layout ="inline"
    v-model="dataForm"
    >
    <a-form-item label="日期:">
        <a-date-picker
            @change="handleSelectDateOther"
            :clearable="false"
            v-model="dataForm.selectDate2"
            mode="date"
            size="small"
            style="width: 160px"
            placeholder="選擇日期"
            :picker-options="pickerOptions"
         ></a-date-picker>
     </a-form-item>
</a-form>

/*
*以下是js中定義
*/ 

data(){
    return:{
        dataForm: {
            selectDate: this.$getCurrentTime(0),  //自定義一個全局擷取目前日期的函數
        }
    }
}      

selectDate: moment(this.$getCurrentTime(0), 'YYYY-MM-DD'),