element time selector, display time, the value is year, month, day, hour, minute and second

Just add the format value-format 

          <el-date-picker
            v-model="serviceData"
            type="datetime"
            placeholder="选择日期时间"
            value-format="yyyy-MM-dd HH:mm:ss"
            :picker-options="pickerOptions"
          >
          </el-date-picker>

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Origin blog.csdn.net/weixin_57607714/article/details/123708590