https://github.com/angular/angular
Tip revision: aef18bcbd68a25de0cb14481789e4bd7f8e02c37 authored by Andrew Scott on 07 October 2021, 19:08:50 UTC
release: cut the v13.0.0-next.15 release (#43769)
release: cut the v13.0.0-next.15 release (#43769)
Tip revision: aef18bc
date_pipe.ts
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import {Inject, InjectionToken, LOCALE_ID, Optional, Pipe, PipeTransform} from '@angular/core';
import {formatDate} from '../i18n/format_date';
import {invalidPipeArgumentError} from './invalid_pipe_argument_error';
/**
* Optionally-provided default timezone to use for all instances of `DatePipe` (such as `'+0430'`).
* If the value isn't provided, the `DatePipe` will use the end-user's local system timezone.
*/
export const DATE_PIPE_DEFAULT_TIMEZONE = new InjectionToken<string>('DATE_PIPE_DEFAULT_TIMEZONE');
// clang-format off
/**
* @ngModule CommonModule
* @description
*
* Formats a date value according to locale rules.
*
* `DatePipe` is executed only when it detects a pure change to the input value.
* A pure change is either a change to a primitive input value
* (such as `String`, `Number`, `Boolean`, or `Symbol`),
* or a changed object reference (such as `Date`, `Array`, `Function`, or `Object`).
*
* Note that mutating a `Date` object does not cause the pipe to be rendered again.
* To ensure that the pipe is executed, you must create a new `Date` object.
*
* Only the `en-US` locale data comes with Angular. To localize dates
* in another language, you must import the corresponding locale data.
* See the [I18n guide](guide/i18n-common-format-data-locale) for more information.
*
* The time zone of the formatted value can be specified either by passing it in as the second
* parameter of the pipe, or by setting the default through the `DATE_PIPE_DEFAULT_TIMEZONE`
* injection token. The value that is passed in as the second parameter takes precedence over
* the one defined using the injection token.
*
* @see `formatDate()`
*
*
* @usageNotes
*
* The result of this pipe is not reevaluated when the input is mutated. To avoid the need to
* reformat the date on every change-detection cycle, treat the date as an immutable object
* and change the reference when the pipe needs to run again.
*
* ### Pre-defined format options
*
* | Option | Equivalent to | Examples (given in `en-US` locale) |
* |---------------|-------------------------------------|-------------------------------------------------|
* | `'short'` | `'M/d/yy, h:mm a'` | `6/15/15, 9:03 AM` |
* | `'medium'` | `'MMM d, y, h:mm:ss a'` | `Jun 15, 2015, 9:03:01 AM` |
* | `'long'` | `'MMMM d, y, h:mm:ss a z'` | `June 15, 2015 at 9:03:01 AM GMT+1` |
* | `'full'` | `'EEEE, MMMM d, y, h:mm:ss a zzzz'` | `Monday, June 15, 2015 at 9:03:01 AM GMT+01:00` |
* | `'shortDate'` | `'M/d/yy'` | `6/15/15` |
* | `'mediumDate'`| `'MMM d, y'` | `Jun 15, 2015` |
* | `'longDate'` | `'MMMM d, y'` | `June 15, 2015` |
* | `'fullDate'` | `'EEEE, MMMM d, y'` | `Monday, June 15, 2015` |
* | `'shortTime'` | `'h:mm a'` | `9:03 AM` |
* | `'mediumTime'`| `'h:mm:ss a'` | `9:03:01 AM` |
* | `'longTime'` | `'h:mm:ss a z'` | `9:03:01 AM GMT+1` |
* | `'fullTime'` | `'h:mm:ss a zzzz'` | `9:03:01 AM GMT+01:00` |
*
* ### Custom format options
*
* You can construct a format string using symbols to specify the components
* of a date-time value, as described in the following table.
* Format details depend on the locale.
* Fields marked with (*) are only available in the extra data set for the given locale.
*
* | Field type | Format | Description | Example Value |
* |-------------------- |-------------|---------------------------------------------------------------|------------------------------------------------------------|
* | Era | G, GG & GGG | Abbreviated | AD |
* | | GGGG | Wide | Anno Domini |
* | | GGGGG | Narrow | A |
* | Year | y | Numeric: minimum digits | 2, 20, 201, 2017, 20173 |
* | | yy | Numeric: 2 digits + zero padded | 02, 20, 01, 17, 73 |
* | | yyy | Numeric: 3 digits + zero padded | 002, 020, 201, 2017, 20173 |
* | | yyyy | Numeric: 4 digits or more + zero padded | 0002, 0020, 0201, 2017, 20173 |
* | Week-numbering year | Y | Numeric: minimum digits | 2, 20, 201, 2017, 20173 |
* | | YY | Numeric: 2 digits + zero padded | 02, 20, 01, 17, 73 |
* | | YYY | Numeric: 3 digits + zero padded | 002, 020, 201, 2017, 20173 |
* | | YYYY | Numeric: 4 digits or more + zero padded | 0002, 0020, 0201, 2017, 20173 |
* | Month | M | Numeric: 1 digit | 9, 12 |
* | | MM | Numeric: 2 digits + zero padded | 09, 12 |
* | | MMM | Abbreviated | Sep |
* | | MMMM | Wide | September |
* | | MMMMM | Narrow | S |
* | Month standalone | L | Numeric: 1 digit | 9, 12 |
* | | LL | Numeric: 2 digits + zero padded | 09, 12 |
* | | LLL | Abbreviated | Sep |
* | | LLLL | Wide | September |
* | | LLLLL | Narrow | S |
* | Week of year | w | Numeric: minimum digits | 1... 53 |
* | | ww | Numeric: 2 digits + zero padded | 01... 53 |
* | Week of month | W | Numeric: 1 digit | 1... 5 |
* | Day of month | d | Numeric: minimum digits | 1 |
* | | dd | Numeric: 2 digits + zero padded | 01 |
* | Week day | E, EE & EEE | Abbreviated | Tue |
* | | EEEE | Wide | Tuesday |
* | | EEEEE | Narrow | T |
* | | EEEEEE | Short | Tu |
* | Week day standalone | c, cc | Numeric: 1 digit | 2 |
* | | ccc | Abbreviated | Tue |
* | | cccc | Wide | Tuesday |
* | | ccccc | Narrow | T |
* | | cccccc | Short | Tu |
* | Period | a, aa & aaa | Abbreviated | am/pm or AM/PM |
* | | aaaa | Wide (fallback to `a` when missing) | ante meridiem/post meridiem |
* | | aaaaa | Narrow | a/p |
* | Period* | B, BB & BBB | Abbreviated | mid. |
* | | BBBB | Wide | am, pm, midnight, noon, morning, afternoon, evening, night |
* | | BBBBB | Narrow | md |
* | Period standalone* | b, bb & bbb | Abbreviated | mid. |
* | | bbbb | Wide | am, pm, midnight, noon, morning, afternoon, evening, night |
* | | bbbbb | Narrow | md |
* | Hour 1-12 | h | Numeric: minimum digits | 1, 12 |
* | | hh | Numeric: 2 digits + zero padded | 01, 12 |
* | Hour 0-23 | H | Numeric: minimum digits | 0, 23 |
* | | HH | Numeric: 2 digits + zero padded | 00, 23 |
* | Minute | m | Numeric: minimum digits | 8, 59 |
* | | mm | Numeric: 2 digits + zero padded | 08, 59 |
* | Second | s | Numeric: minimum digits | 0... 59 |
* | | ss | Numeric: 2 digits + zero padded | 00... 59 |
* | Fractional seconds | S | Numeric: 1 digit | 0... 9 |
* | | SS | Numeric: 2 digits + zero padded | 00... 99 |
* | | SSS | Numeric: 3 digits + zero padded (= milliseconds) | 000... 999 |
* | Zone | z, zz & zzz | Short specific non location format (fallback to O) | GMT-8 |
* | | zzzz | Long specific non location format (fallback to OOOO) | GMT-08:00 |
* | | Z, ZZ & ZZZ | ISO8601 basic format | -0800 |
* | | ZZZZ | Long localized GMT format | GMT-8:00 |
* | | ZZZZZ | ISO8601 extended format + Z indicator for offset 0 (= XXXXX) | -08:00 |
* | | O, OO & OOO | Short localized GMT format | GMT-8 |
* | | OOOO | Long localized GMT format | GMT-08:00 |
*
*
* ### Format examples
*
* These examples transform a date into various formats,
* assuming that `dateObj` is a JavaScript `Date` object for
* year: 2015, month: 6, day: 15, hour: 21, minute: 43, second: 11,
* given in the local time for the `en-US` locale.
*
* ```
* {{ dateObj | date }} // output is 'Jun 15, 2015'
* {{ dateObj | date:'medium' }} // output is 'Jun 15, 2015, 9:43:11 PM'
* {{ dateObj | date:'shortTime' }} // output is '9:43 PM'
* {{ dateObj | date:'mm:ss' }} // output is '43:11'
* ```
*
* ### Usage example
*
* The following component uses a date pipe to display the current date in different formats.
*
* ```
* @Component({
* selector: 'date-pipe',
* template: `<div>
* <p>Today is {{today | date}}</p>
* <p>Or if you prefer, {{today | date:'fullDate'}}</p>
* <p>The time is {{today | date:'h:mm a z'}}</p>
* </div>`
* })
* // Get the current date and time as a date-time value.
* export class DatePipeComponent {
* today: number = Date.now();
* }
* ```
*
* @publicApi
*/
// clang-format on
@Pipe({name: 'date', pure: true})
export class DatePipe implements PipeTransform {
constructor(
@Inject(LOCALE_ID) private locale: string,
@Inject(DATE_PIPE_DEFAULT_TIMEZONE) @Optional() private defaultTimezone?: string|null) {}
/**
* @param value The date expression: a `Date` object, a number
* (milliseconds since UTC epoch), or an ISO string (https://www.w3.org/TR/NOTE-datetime).
* @param format The date/time components to include, using predefined options or a
* custom format string.
* @param timezone A timezone offset (such as `'+0430'`), or a standard UTC/GMT, or continental US
* timezone abbreviation. When not supplied, either the value of the `DATE_PIPE_DEFAULT_TIMEZONE`
* injection token is used or the end-user's local system timezone.
* @param locale A locale code for the locale format rules to use.
* When not supplied, uses the value of `LOCALE_ID`, which is `en-US` by default.
* See [Setting your app locale](guide/i18n-common-locale-id).
* @returns A date string in the desired format.
*/
transform(value: Date|string|number, format?: string, timezone?: string, locale?: string): string
|null;
transform(value: null|undefined, format?: string, timezone?: string, locale?: string): null;
transform(
value: Date|string|number|null|undefined, format?: string, timezone?: string,
locale?: string): string|null;
transform(
value: Date|string|number|null|undefined, format = 'mediumDate', timezone?: string,
locale?: string): string|null {
if (value == null || value === '' || value !== value) return null;
try {
return formatDate(
value, format, locale || this.locale, timezone ?? this.defaultTimezone ?? undefined);
} catch (error) {
throw invalidPipeArgumentError(DatePipe, error.message);
}
}
}
