## DatePicker
Use Date Picker for date input.
### Enter Date
Basic date picker measured by 'day'.
:::demo The measurement is determined by the `type` attribute. You can enable quick options by creating a `picker-options` object with `shortcuts` property. The disabled date is set by `disabledDate`, which is a function.
```html
Default
Picker with quick options
```
:::
### Other measurements
You can choose week, month or year by extending the standard date picker component.
:::demo
```html
Week
Month
Year
```
:::
### Date Range
Picking a date range is supported.
:::demo When in range mode, the left and right panels are linked by default. If you want the two panels to switch current months independently, you can use the `unlink-panels` attribute.
```html
Default
With quick options
```
:::
### Default Value
If user hasn't picked a date, shows today's calendar by default. You can use `default-value` to set another date. Its value should be parsable by `new Date()`.
If type is `daterange`, `default-value` sets the left side calendar.
:::demo
```html
date
daterange
```
:::
### Date Formats
Use `format` to control displayed text's format in the input box. Use `value-format` to control binding value's format.
By default, the component accepts and emits a `Date` object. Below are supported format strings, using UTC 2017-01-02 03:04:05 as an example:
:::warning
Pay attention to capitalization
:::
| format | meaning | note | example |
|------|------|------|------|------|
| `yyyy` | year | | 2017 |
| `M` | month | no leading 0 | 1 |
| `MM` | month | | 01 |
| `W` | week | only for week picker's `format`; no leading 0 | 1 |
| `WW` | week | only for week picker's `format`| 01 |
| `d` | day | no leading 0 | 2 |
| `dd` | day | | 02 |
| `H` | hour | 24-hour clock; no leading 0 | 3 |
| `HH` | hour | 24-hour clock | 03 |
| `h` | hour | 12-hour clock; must be used with `A` or `a`; no leading 0 | 3 |
| `hh` | hour | 12-hour clock; must be used with `A` or `a` | 03 |
| `m` | minute | no leading 0 | 4 |
| `mm` | minute | | 04 |
| `s` | second | no leading 0 | 5 |
| `ss` | second | | 05 |
| `A` | AM/PM | only for `format`, uppercased | AM |
| `a` | am/pm | only for `format`, lowercased | am |
| `timestamp` | JS timestamp | only for `value-format`; binding value will be a `number` | 1483326245000 |
:::demo
```html
Emits Date object
Value: {{ value10 }}
Use value-format
Value: {{ value11 }}
Timestamp
Value：{{ value12 }}
```
:::
### Default time for start date and end date
When picking a date range, you can assign the time part for start date and end date.
:::demo By default, the time part of start date and end date are both `00:00:00`. Setting `default-time` can change their time respectively. It accepts an array of up to two strings with the format of `12:00:00`. The first string sets the time for the start date, and the second for the end date.
```html
Component value：{{ value13 }}
```
:::
### Attributes
| Attribute | Description | Type | Accepted Values | Default |
|---------- |-------------- |---------- |-------------------------------- |-------- |
| readonly | whether DatePicker is read only | boolean | — | false |
| disabled | whether DatePicker is disabled | boolean | — | false |
| size | size of Input | string | large/small/mini | — |
| editable | whether the input is editable | boolean | — | true |
| clearable | Whether to show clear button | boolean | — | true |
| placeholder | placeholder in non-range mode | string | — | — |
| start-placeholder | placeholder for the start date in range mode | string | — | — |
| end-placeholder | placeholder for the end date in range mode | string | — | — |
| type | type of the picker | string | year/month/date/datetime/ week/datetimerange/daterange | date |
| format | format of the displayed value in the input box | string | see [date formats](#/en-US/component/date-picker#date-formats) | yyyy-MM-dd |
| align | alignment | left/center/right | left |
| popper-class | custom class name for DatePicker's dropdown | string | — | — |
| picker-options | additional options, check the table below | object | — | {} |
| range-separator | range separator | string | — | '-' |
| default-value | optional, default date of the calendar | Date | anything accepted by `new Date()` | — |
| default-time | optional, the time value to use when selecting date range | string[] | Array with length 2, each item is a string like `12:00:00`. The first item for the start date and then second item for the end date | — |
| value-format | optional, format of binding value. If not specified, the binding value will be a Date object | string | see [date formats](#/en-US/component/date-picker#date-formats) | — |
| name | same as `name` in native input | string | — | — |
| unlink-panels | unlink two date-panels in range-picker | boolean | — | false |
| prefix-icon | Custom prefix icon class | string | — | el-icon-date |
| clear-icon | Custom clear icon class | string | — | el-icon-circle-close |
### Picker Options
| Attribute | Description | Type | Accepted Values | Default |
|---------- |-------------- |---------- |-------------------------------- |-------- |
| shortcuts | a { text, onClick } object array to set shortcut options, check the table below | object[] | — | — |
| disabledDate | a function determining if a date is disabled with that date as its parameter. Should return a Boolean | function | — | — |
| firstDayOfWeek | first day of week | Number | 1 to 7 | 7 |
| onPick | a callback that triggers when the selected date is changed. Only for `daterange` and `datetimerange`. | Function({ maxDate, minDate }) | - | - |
### shortcuts
| Attribute | Description | Type | Accepted Values | Default |
|---------- |-------------- |---------- |-------------------------------- |-------- |
| text | title of the shortcut | string | — | — |
| onClick | callback function, triggers when the shortcut is clicked, with the `vm` as its parameter. You can change the picker value by emitting the `pick` event. Example: `vm.$emit('pick', new Date())`| function | — | — |
### Events
| Event Name | Description | Parameters |
|---------|--------|---------|
| change | triggers when user confirms the value | component's binding value |
| blur | triggers when Input blurs | component instance |
| focus | triggers when Input focuses | component instance |
### Methods
| Method | Description | Parameters |
|------|--------|-------|
| focus | focus the Input component | — |