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---
category: Components
type: 数据录入
title: DatePicker
subtitle: 日期选择框
cover: https://gw.alipayobjects.com/zos/alicdn/Xr6CsbN_a/DatePicker.svg
---
输入或选择日期的控件。
## 何时使用
当用户需要输入一个日期,可以点击标准输入框,弹出日期面板进行选择。
9 years ago
## API
feat: New Picker (#20023) * init generate * basic style * basic panel style * update mode panel style * update style * generate More picker * default clear icon * chore: Update separator type * feat: Add ranged start & end className * update range style * Add transition effect * support size config * adjust range style * chore: Auto fill time by showTime * auto set time by format * update disabled style * update seperator style * ranges style * support extra footer style * remove useless test case part is not usable anymore part is already tested in rc-picker * init calendar * all demos * fix calendar basic test * fix time-picker test case * update snapshot * fix tooltip test case & lint * fix locale & style lint * fix compile * fix style * fix style lint * fix calendar style * update rc-picker version * adjust style * move picker placeholder into locale file * update snapshot * add hover style * update picker version * fix icon position & style * update picker version * update deps for pading * fix: align of suffix * feat: Year & Month support range effect * adjust range style to support up-down placement * update rc-picker * update range picker style * adjust extra footer line style * update snapshot * fix: Locale error * fix: style lint * fix: add missing button style deps * update test case * fix firefox additional white line style issue * rollback demo * fix ff additional blue color * docs: Remove placeholder in demo * rangepicker ranges is tag now * connect start / end background color with picker range * update deps * update deps for fixing blur text issue * hide start-end demo * range hover style update * hover range with ranged value * black magic of inner hover style * hover style of range adjust * fix css select miss hit on DatePicker * remove one eslint rule * fade range hovered color * week should alway not show the cell selection * update style of selection * update snapshot * fix style * add margin back * update rc-picker deps * update date & time picker & form style * fix disabled demo & update form style * update docs about allowEmpty * hide arrow in time range picker * add hover & focused style * fix lint * fix style & update snapshot * raise disabled selector proirity * fix disabled today border color * extra footer provides an bottom line * time picker hover support transition background * add padding style * fix Firefox not correct calculate inline-flex * fix style * fix week picker missing today border color * rm useless padding * Force padding to 0 * test coverage * dedup eslint rule * adjust logic to imporve coverage * fix render cell logic
5 years ago
日期类组件包括以下五种形式。
- DatePicker
- MonthPicker
- RangePicker
- WeekPicker
feat: New Picker (#20023) * init generate * basic style * basic panel style * update mode panel style * update style * generate More picker * default clear icon * chore: Update separator type * feat: Add ranged start & end className * update range style * Add transition effect * support size config * adjust range style * chore: Auto fill time by showTime * auto set time by format * update disabled style * update seperator style * ranges style * support extra footer style * remove useless test case part is not usable anymore part is already tested in rc-picker * init calendar * all demos * fix calendar basic test * fix time-picker test case * update snapshot * fix tooltip test case & lint * fix locale & style lint * fix compile * fix style * fix style lint * fix calendar style * update rc-picker version * adjust style * move picker placeholder into locale file * update snapshot * add hover style * update picker version * fix icon position & style * update picker version * update deps for pading * fix: align of suffix * feat: Year & Month support range effect * adjust range style to support up-down placement * update rc-picker * update range picker style * adjust extra footer line style * update snapshot * fix: Locale error * fix: style lint * fix: add missing button style deps * update test case * fix firefox additional white line style issue * rollback demo * fix ff additional blue color * docs: Remove placeholder in demo * rangepicker ranges is tag now * connect start / end background color with picker range * update deps * update deps for fixing blur text issue * hide start-end demo * range hover style update * hover range with ranged value * black magic of inner hover style * hover style of range adjust * fix css select miss hit on DatePicker * remove one eslint rule * fade range hovered color * week should alway not show the cell selection * update style of selection * update snapshot * fix style * add margin back * update rc-picker deps * update date & time picker & form style * fix disabled demo & update form style * update docs about allowEmpty * hide arrow in time range picker * add hover & focused style * fix lint * fix style & update snapshot * raise disabled selector proirity * fix disabled today border color * extra footer provides an bottom line * time picker hover support transition background * add padding style * fix Firefox not correct calculate inline-flex * fix style * fix week picker missing today border color * rm useless padding * Force padding to 0 * test coverage * dedup eslint rule * adjust logic to imporve coverage * fix render cell logic
5 years ago
- YearPicker
- QuarterPicker (4.1.0 新增)
### 国际化配置
默认配置为 en-US,如果你需要设置其他语言,推荐在入口处使用我们提供的国际化组件,详见:[ConfigProvider 国际化](https://ant.design/components/config-provider-cn/)。
如有特殊需求(仅修改单一组件的语言),请使用 locale 参数,参考:[默认配置](https://github.com/ant-design/ant-design/blob/master/components/date-picker/locale/example.json)。
```jsx
import locale from 'antd/es/date-picker/locale/zh_CN';
<DatePicker locale={locale} />;
```
```jsx
// 默认语言为 en-US,如果你需要设置其他语言,推荐在入口文件全局设置 locale
import moment from 'moment';
import 'moment/locale/zh-cn';
<DatePicker defaultValue={moment('2015-01-01', 'YYYY-MM-DD')} />;
10 years ago
```
### 共同的 API
feat: New Picker (#20023) * init generate * basic style * basic panel style * update mode panel style * update style * generate More picker * default clear icon * chore: Update separator type * feat: Add ranged start &amp; end className * update range style * Add transition effect * support size config * adjust range style * chore: Auto fill time by showTime * auto set time by format * update disabled style * update seperator style * ranges style * support extra footer style * remove useless test case part is not usable anymore part is already tested in rc-picker * init calendar * all demos * fix calendar basic test * fix time-picker test case * update snapshot * fix tooltip test case &amp; lint * fix locale &amp; style lint * fix compile * fix style * fix style lint * fix calendar style * update rc-picker version * adjust style * move picker placeholder into locale file * update snapshot * add hover style * update picker version * fix icon position &amp; style * update picker version * update deps for pading * fix: align of suffix * feat: Year &amp; Month support range effect * adjust range style to support up-down placement * update rc-picker * update range picker style * adjust extra footer line style * update snapshot * fix: Locale error * fix: style lint * fix: add missing button style deps * update test case * fix firefox additional white line style issue * rollback demo * fix ff additional blue color * docs: Remove placeholder in demo * rangepicker ranges is tag now * connect start / end background color with picker range * update deps * update deps for fixing blur text issue * hide start-end demo * range hover style update * hover range with ranged value * black magic of inner hover style * hover style of range adjust * fix css select miss hit on DatePicker * remove one eslint rule * fade range hovered color * week should alway not show the cell selection * update style of selection * update snapshot * fix style * add margin back * update rc-picker deps * update date &amp; time picker &amp; form style * fix disabled demo &amp; update form style * update docs about allowEmpty * hide arrow in time range picker * add hover &amp; focused style * fix lint * fix style &amp; update snapshot * raise disabled selector proirity * fix disabled today border color * extra footer provides an bottom line * time picker hover support transition background * add padding style * fix Firefox not correct calculate inline-flex * fix style * fix week picker missing today border color * rm useless padding * Force padding to 0 * test coverage * dedup eslint rule * adjust logic to imporve coverage * fix render cell logic
5 years ago
以下 API 为 DatePicker、YearPicker、MonthPicker、RangePicker, WeekPicker 共享的 API。
| 参数 | 说明 | 类型 | 默认值 | 版本 |
| --- | --- | --- | --- | --- |
| allowClear | 是否显示清除按钮 | boolean | true | |
| autoFocus | 自动获取焦点 | boolean | false | |
| className | 选择器 className | string | '' | |
| dateRender | 自定义日期单元格的内容 | function(currentDate: moment, today: moment) => React.ReactNode | - | |
| disabled | 禁用 | boolean | false | |
| disabledDate | 不可选择的日期 | (currentDate: moment) => boolean | 无 | |
| dropdownClassName | 额外的弹出日历 className | string | - | |
feat: New Picker (#20023) * init generate * basic style * basic panel style * update mode panel style * update style * generate More picker * default clear icon * chore: Update separator type * feat: Add ranged start &amp; end className * update range style * Add transition effect * support size config * adjust range style * chore: Auto fill time by showTime * auto set time by format * update disabled style * update seperator style * ranges style * support extra footer style * remove useless test case part is not usable anymore part is already tested in rc-picker * init calendar * all demos * fix calendar basic test * fix time-picker test case * update snapshot * fix tooltip test case &amp; lint * fix locale &amp; style lint * fix compile * fix style * fix style lint * fix calendar style * update rc-picker version * adjust style * move picker placeholder into locale file * update snapshot * add hover style * update picker version * fix icon position &amp; style * update picker version * update deps for pading * fix: align of suffix * feat: Year &amp; Month support range effect * adjust range style to support up-down placement * update rc-picker * update range picker style * adjust extra footer line style * update snapshot * fix: Locale error * fix: style lint * fix: add missing button style deps * update test case * fix firefox additional white line style issue * rollback demo * fix ff additional blue color * docs: Remove placeholder in demo * rangepicker ranges is tag now * connect start / end background color with picker range * update deps * update deps for fixing blur text issue * hide start-end demo * range hover style update * hover range with ranged value * black magic of inner hover style * hover style of range adjust * fix css select miss hit on DatePicker * remove one eslint rule * fade range hovered color * week should alway not show the cell selection * update style of selection * update snapshot * fix style * add margin back * update rc-picker deps * update date &amp; time picker &amp; form style * fix disabled demo &amp; update form style * update docs about allowEmpty * hide arrow in time range picker * add hover &amp; focused style * fix lint * fix style &amp; update snapshot * raise disabled selector proirity * fix disabled today border color * extra footer provides an bottom line * time picker hover support transition background * add padding style * fix Firefox not correct calculate inline-flex * fix style * fix week picker missing today border color * rm useless padding * Force padding to 0 * test coverage * dedup eslint rule * adjust logic to imporve coverage * fix render cell logic
5 years ago
| getPopupContainer | 定义浮层的容器,默认为 body 上新建 div | function(trigger) | 无 | |
| locale | 国际化配置 | object | [默认配置](https://github.com/ant-design/ant-design/blob/master/components/date-picker/locale/example.json) | |
| mode | 日期面板的状态([设置后无法选择年份/月份?](/docs/react/faq#当我指定了-DatePicker/RangePicker-的-mode-属性后,点击后无法选择年份/月份?)) | `time` \| `date` \| `month` \| `year` \| `decade` | - | |
| open | 控制弹层是否展开 | boolean | - | |
| picker | 设置选择器类型 | `date` \| `week` \| `month` \| `quarter` (4.1.0) \| `year` | `date` | |
| placeholder | 输入框提示文字 | string\|RangePicker\[] | - | |
| popupStyle | 额外的弹出日历样式 | CSSProperties | {} | |
| size | 输入框大小,`large` 高度为 40px,`small` 为 24px,默认是 32px | `large` \| `middle` \| `small` | 无 | |
| bordered | 是否有边框 | Boolean | true | |
| suffixIcon | 自定义的选择框后缀图标 | ReactNode | - | |
| style | 自定义输入框样式 | CSSProperties | {} | |
| onOpenChange | 弹出日历和关闭日历的回调 | function(open) | 无 | |
| onPanelChange | 日历面板切换的回调 | function(value, mode) | - | |
| inputReadOnly | 设置输入框为只读(避免在移动设备上打开虚拟键盘) | boolean | false | |
### 共同的方法
| 名称 | 描述 | 版本 |
| ------- | -------- | ---- |
| blur() | 移除焦点 | |
| focus() | 获取焦点 | |
### DatePicker
| 参数 | 说明 | 类型 | 默认值 | 版本 |
| --- | --- | --- | --- | --- |
| defaultValue | 默认日期,如果开始时间或结束时间为 `null` 或者 `undefined`,日期范围将是一个开区间 | [moment](http://momentjs.com/) | 无 | |
| defaultPickerValue | 默认面板日期 | [moment](http://momentjs.com/) | 无 | |
| disabledTime | 不可选择的时间 | function(date) | 无 | |
| format | 设置日期格式,为数组时支持多格式匹配,展示以第一个为准。配置参考 [moment.js](http://momentjs.com/) | string \| string[] | "YYYY-MM-DD" | |
| renderExtraFooter | 在面板中添加额外的页脚 | (mode) => React.ReactNode | - | |
| showTime | 增加时间选择功能 | Object\|boolean | [TimePicker Options](/components/time-picker/#API) | |
| showTime.defaultValue | 设置用户选择日期时默认的时分秒,[例子](#components-date-picker-demo-disabled-date) | [moment](http://momentjs.com/) | moment() | |
| showToday | 是否展示“今天”按钮 | boolean | true | |
| value | 日期 | [moment](http://momentjs.com/) | 无 | |
| onChange | 时间发生变化的回调 | function(date: moment, dateString: string) | 无 | |
| onOk | 点击确定按钮的回调 | function() | - | |
| onPanelChange | 日期面板变化时的回调 | function(value, mode) | - | |
feat: New Picker (#20023) * init generate * basic style * basic panel style * update mode panel style * update style * generate More picker * default clear icon * chore: Update separator type * feat: Add ranged start &amp; end className * update range style * Add transition effect * support size config * adjust range style * chore: Auto fill time by showTime * auto set time by format * update disabled style * update seperator style * ranges style * support extra footer style * remove useless test case part is not usable anymore part is already tested in rc-picker * init calendar * all demos * fix calendar basic test * fix time-picker test case * update snapshot * fix tooltip test case &amp; lint * fix locale &amp; style lint * fix compile * fix style * fix style lint * fix calendar style * update rc-picker version * adjust style * move picker placeholder into locale file * update snapshot * add hover style * update picker version * fix icon position &amp; style * update picker version * update deps for pading * fix: align of suffix * feat: Year &amp; Month support range effect * adjust range style to support up-down placement * update rc-picker * update range picker style * adjust extra footer line style * update snapshot * fix: Locale error * fix: style lint * fix: add missing button style deps * update test case * fix firefox additional white line style issue * rollback demo * fix ff additional blue color * docs: Remove placeholder in demo * rangepicker ranges is tag now * connect start / end background color with picker range * update deps * update deps for fixing blur text issue * hide start-end demo * range hover style update * hover range with ranged value * black magic of inner hover style * hover style of range adjust * fix css select miss hit on DatePicker * remove one eslint rule * fade range hovered color * week should alway not show the cell selection * update style of selection * update snapshot * fix style * add margin back * update rc-picker deps * update date &amp; time picker &amp; form style * fix disabled demo &amp; update form style * update docs about allowEmpty * hide arrow in time range picker * add hover &amp; focused style * fix lint * fix style &amp; update snapshot * raise disabled selector proirity * fix disabled today border color * extra footer provides an bottom line * time picker hover support transition background * add padding style * fix Firefox not correct calculate inline-flex * fix style * fix week picker missing today border color * rm useless padding * Force padding to 0 * test coverage * dedup eslint rule * adjust logic to imporve coverage * fix render cell logic
5 years ago
### YearPicker
| 参数 | 说明 | 类型 | 默认值 | 版本 |
| --- | --- | --- | --- | --- |
| defaultValue | 默认日期 | [moment](http://momentjs.com/) | 无 | |
| defaultPickerValue | 默认面板日期 | [moment](http://momentjs.com/) | 无 | |
| format | 展示的日期格式,配置参考 [moment.js](http://momentjs.com/) | string | "YYYY" | |
| renderExtraFooter | 在面板中添加额外的页脚 | () => React.ReactNode | - | |
| value | 日期 | [moment](http://momentjs.com/) | 无 | |
| onChange | 时间发生变化的回调,发生在用户选择时间时 | function(date: moment, dateString: string) | - | |
### QuarterPicker
`4.1.0` 新增。
| 参数 | 说明 | 类型 | 默认值 | 版本 |
| --- | --- | --- | --- | --- |
| defaultValue | 默认日期 | [moment](http://momentjs.com/) | 无 | |
| defaultPickerValue | 默认面板日期 | [moment](http://momentjs.com/) | 无 | |
| format | 展示的日期格式,配置参考 [moment.js](http://momentjs.com/) | string | "YYYY-\QQ" | |
| renderExtraFooter | 在面板中添加额外的页脚 | () => React.ReactNode | - | |
| value | 日期 | [moment](http://momentjs.com/) | 无 | |
| onChange | 时间发生变化的回调,发生在用户选择时间时 | function(date: moment, dateString: string) | - | |
### MonthPicker
| 参数 | 说明 | 类型 | 默认值 | 版本 |
| --- | --- | --- | --- | --- |
| defaultValue | 默认日期 | [moment](http://momentjs.com/) | 无 | |
| defaultPickerValue | 默认面板日期 | [moment](http://momentjs.com/) | 无 | |
| format | 展示的日期格式,配置参考 [moment.js](http://momentjs.com/) | string | "YYYY-MM" | |
| monthCellRender | 自定义的月份内容渲染方法 | function(date, locale): ReactNode | - | |
| renderExtraFooter | 在面板中添加额外的页脚 | () => React.ReactNode | - | |
| value | 日期 | [moment](http://momentjs.com/) | 无 | |
| onChange | 时间发生变化的回调,发生在用户选择时间时 | function(date: moment, dateString: string) | - | |
### WeekPicker
| 参数 | 说明 | 类型 | 默认值 | 版本 |
| --- | --- | --- | --- | --- |
| defaultValue | 默认日期 | [moment](http://momentjs.com/) | - | |
| defaultPickerValue | 默认面板日期 | [moment](http://momentjs.com/) | 无 | |
| format | 展示的日期格式,配置参考 [moment.js](http://momentjs.com/) | string | "YYYY-wo" | |
| value | 日期 | [moment](http://momentjs.com/) | - | |
| onChange | 时间发生变化的回调,发生在用户选择时间时 | function(date: moment, dateString: string) | - | |
| renderExtraFooter | 在面板中添加额外的页脚 | (mode) => React.ReactNode | - | |
### RangePicker
| 参数 | 说明 | 类型 | 默认值 | 版本 |
| --- | --- | --- | --- | --- |
feat: New Picker (#20023) * init generate * basic style * basic panel style * update mode panel style * update style * generate More picker * default clear icon * chore: Update separator type * feat: Add ranged start &amp; end className * update range style * Add transition effect * support size config * adjust range style * chore: Auto fill time by showTime * auto set time by format * update disabled style * update seperator style * ranges style * support extra footer style * remove useless test case part is not usable anymore part is already tested in rc-picker * init calendar * all demos * fix calendar basic test * fix time-picker test case * update snapshot * fix tooltip test case &amp; lint * fix locale &amp; style lint * fix compile * fix style * fix style lint * fix calendar style * update rc-picker version * adjust style * move picker placeholder into locale file * update snapshot * add hover style * update picker version * fix icon position &amp; style * update picker version * update deps for pading * fix: align of suffix * feat: Year &amp; Month support range effect * adjust range style to support up-down placement * update rc-picker * update range picker style * adjust extra footer line style * update snapshot * fix: Locale error * fix: style lint * fix: add missing button style deps * update test case * fix firefox additional white line style issue * rollback demo * fix ff additional blue color * docs: Remove placeholder in demo * rangepicker ranges is tag now * connect start / end background color with picker range * update deps * update deps for fixing blur text issue * hide start-end demo * range hover style update * hover range with ranged value * black magic of inner hover style * hover style of range adjust * fix css select miss hit on DatePicker * remove one eslint rule * fade range hovered color * week should alway not show the cell selection * update style of selection * update snapshot * fix style * add margin back * update rc-picker deps * update date &amp; time picker &amp; form style * fix disabled demo &amp; update form style * update docs about allowEmpty * hide arrow in time range picker * add hover &amp; focused style * fix lint * fix style &amp; update snapshot * raise disabled selector proirity * fix disabled today border color * extra footer provides an bottom line * time picker hover support transition background * add padding style * fix Firefox not correct calculate inline-flex * fix style * fix week picker missing today border color * rm useless padding * Force padding to 0 * test coverage * dedup eslint rule * adjust logic to imporve coverage * fix render cell logic
5 years ago
| allowEmpty | 允许起始项部分为空 | \[boolean, boolean] | \[false, false] | |
| dateRender | 自定义日期单元格的内容。`info` 参数自 4.3.0 添加 | function(currentDate: moment, today: moment, info: { range: 'start' \| ''end }) => React.ReactNode | - | |
| defaultValue | 默认日期 | [moment](http://momentjs.com/)\[] | 无 | |
| defaultPickerValue | 默认面板日期 | [moment](http://momentjs.com/)\[] | 无 | |
| disabled | 禁用起始项 | `[boolean, boolean]` | 无 | |
| disabledTime | 不可选择的时间 | function(dates: \[moment, moment\], partial: `'start'|'end'`) | 无 | |
| format | 展示的日期格式 | string | "YYYY-MM-DD HH:mm:ss" | |
| ranges | 预设时间范围快捷选择 | { \[range: string]: [moment](http://momentjs.com/)\[] } \| { \[range: string]: () => [moment](http://momentjs.com/)\[] } | 无 | |
| renderExtraFooter | 在面板中添加额外的页脚 | () => React.ReactNode | - | |
| separator | 设置分隔符 | string | '~' | |
| showTime | 增加时间选择功能 | Object\|boolean | [TimePicker Options](/components/time-picker/#API) | |
| showTime.defaultValue | 设置用户选择日期时默认的时分秒,[例子](#components-date-picker-demo-disabled-date) | [moment](http://momentjs.com/)\[] | \[moment(), moment()] | |
| value | 日期 | [moment](http://momentjs.com/)\[] | 无 | |
| onCalendarChange | 待选日期发生变化的回调 | function(dates: \[moment, moment\], dateStrings: \[string, string\]) | 无 | |
| onChange | 日期范围发生变化的回调 | function(dates: \[moment, moment\], dateStrings: \[string, string\]) | 无 | |
<style>
feat: New Picker (#20023) * init generate * basic style * basic panel style * update mode panel style * update style * generate More picker * default clear icon * chore: Update separator type * feat: Add ranged start &amp; end className * update range style * Add transition effect * support size config * adjust range style * chore: Auto fill time by showTime * auto set time by format * update disabled style * update seperator style * ranges style * support extra footer style * remove useless test case part is not usable anymore part is already tested in rc-picker * init calendar * all demos * fix calendar basic test * fix time-picker test case * update snapshot * fix tooltip test case &amp; lint * fix locale &amp; style lint * fix compile * fix style * fix style lint * fix calendar style * update rc-picker version * adjust style * move picker placeholder into locale file * update snapshot * add hover style * update picker version * fix icon position &amp; style * update picker version * update deps for pading * fix: align of suffix * feat: Year &amp; Month support range effect * adjust range style to support up-down placement * update rc-picker * update range picker style * adjust extra footer line style * update snapshot * fix: Locale error * fix: style lint * fix: add missing button style deps * update test case * fix firefox additional white line style issue * rollback demo * fix ff additional blue color * docs: Remove placeholder in demo * rangepicker ranges is tag now * connect start / end background color with picker range * update deps * update deps for fixing blur text issue * hide start-end demo * range hover style update * hover range with ranged value * black magic of inner hover style * hover style of range adjust * fix css select miss hit on DatePicker * remove one eslint rule * fade range hovered color * week should alway not show the cell selection * update style of selection * update snapshot * fix style * add margin back * update rc-picker deps * update date &amp; time picker &amp; form style * fix disabled demo &amp; update form style * update docs about allowEmpty * hide arrow in time range picker * add hover &amp; focused style * fix lint * fix style &amp; update snapshot * raise disabled selector proirity * fix disabled today border color * extra footer provides an bottom line * time picker hover support transition background * add padding style * fix Firefox not correct calculate inline-flex * fix style * fix week picker missing today border color * rm useless padding * Force padding to 0 * test coverage * dedup eslint rule * adjust logic to imporve coverage * fix render cell logic
5 years ago
.code-box-demo .ant-picker {
margin: 0 8px 12px 0;
}
.ant-row-rtl .code-box-demo .ant-picker {
margin: 0 0 12px 8px;
}
</style>
## FAQ
5 years ago
- [当我指定了 DatePicker/RangePicker 的 mode 属性后,点击后无法选择年份/月份?](/docs/react/faq#当我指定了-DatePicker/RangePicker-的-mode-属性后,点击后无法选择年份/月份?)
- [如何在 DatePicker 中使用自定义日期库(如 dayjs )?](/docs/react/replace-moment#DatePicker)
- 如何修改周的起始日?
请使用正确的[语言包](/docs/react/i18n)([#5605](https://github.com/ant-design/ant-design/issues/5605)),或者修改 moment 的 `locale` 配置:https://codesandbox.io/s/moment-day-of-week-b24k5
```js
moment.locale('en', {
// 注意请修改你正在使用的 locale 语言,比如 zh-cn
week: {
dow: 1,
},
});
```