bug159 会员详情更新页面中，修改“等级有效期“后”保存报：系统异常。请看截图

src/views/member/user/memberDetails.vue

@@ -470,7 +470,7 @@
             <dict-selector v-model="levelDetails.level"  :disabled="levelDetailsCanEdit" clearable :type="DICT_TYPE.MEMBERSHIP_LEVELS" />
           </el-form-item>
           <el-form-item :label="$t('等级有效期:')" prop="validityPeriod">
-            <el-date-picker type="date" :placeholder="$t('请选择日期')" :disabled="levelDetailsCanEdit" v-model="levelDetails.validityPeriod" value-format="yyyy-MM-dd"></el-date-picker>
+            <el-date-picker type="date" :placeholder="$t('请选择日期')" :disabled="levelDetailsCanEdit" v-model="levelDetails.validityPeriod" value-format="yyyy-MM-dd HH:mm:ss"></el-date-picker>
           </el-form-item>
           <el-form-item :label="$t('等级特殊设置')">
             <el-switch