@angular/material
Version:
Angular Material
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JavaScript
/**
* @fileoverview added by tsickle
* Generated from: src/material/core/datetime/native-date-adapter.ts
* @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
/**
* @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 { Platform } from '@angular/cdk/platform';
import { Inject, Injectable, Optional } from '@angular/core';
import { DateAdapter, MAT_DATE_LOCALE } from './date-adapter';
// TODO(mmalerba): Remove when we no longer support safari 9.
/**
* Whether the browser supports the Intl API.
* @type {?}
*/
let SUPPORTS_INTL_API;
// We need a try/catch around the reference to `Intl`, because accessing it in some cases can
// cause IE to throw. These cases are tied to particular versions of Windows and can happen if
// the consumer is providing a polyfilled `Map`. See:
// https://github.com/Microsoft/ChakraCore/issues/3189
// https://github.com/angular/components/issues/15687
try {
SUPPORTS_INTL_API = typeof Intl != 'undefined';
}
catch (_a) {
SUPPORTS_INTL_API = false;
}
/**
* The default month names to use if Intl API is not available.
* @type {?}
*/
const DEFAULT_MONTH_NAMES = {
'long': [
'January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September',
'October', 'November', 'December'
],
'short': ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
'narrow': ['J', 'F', 'M', 'A', 'M', 'J', 'J', 'A', 'S', 'O', 'N', 'D']
};
const ɵ0 = /**
* @param {?} i
* @return {?}
*/
i => String(i + 1);
/**
* The default date names to use if Intl API is not available.
* @type {?}
*/
const DEFAULT_DATE_NAMES = range(31, (ɵ0));
/**
* The default day of the week names to use if Intl API is not available.
* @type {?}
*/
const DEFAULT_DAY_OF_WEEK_NAMES = {
'long': ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
'short': ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],
'narrow': ['S', 'M', 'T', 'W', 'T', 'F', 'S']
};
/**
* Matches strings that have the form of a valid RFC 3339 string
* (https://tools.ietf.org/html/rfc3339). Note that the string may not actually be a valid date
* because the regex will match strings an with out of bounds month, date, etc.
* @type {?}
*/
const ISO_8601_REGEX = /^\d{4}-\d{2}-\d{2}(?:T\d{2}:\d{2}:\d{2}(?:\.\d+)?(?:Z|(?:(?:\+|-)\d{2}:\d{2}))?)?$/;
/**
* Creates an array and fills it with values.
* @template T
* @param {?} length
* @param {?} valueFunction
* @return {?}
*/
function range(length, valueFunction) {
/** @type {?} */
const valuesArray = Array(length);
for (let i = 0; i < length; i++) {
valuesArray[i] = valueFunction(i);
}
return valuesArray;
}
/**
* Adapts the native JS Date for use with cdk-based components that work with dates.
*/
export class NativeDateAdapter extends DateAdapter {
/**
* @param {?} matDateLocale
* @param {?} platform
*/
constructor(matDateLocale, platform) {
super();
/**
* Whether to use `timeZone: 'utc'` with `Intl.DateTimeFormat` when formatting dates.
* Without this `Intl.DateTimeFormat` sometimes chooses the wrong timeZone, which can throw off
* the result. (e.g. in the en-US locale `new Date(1800, 7, 14).toLocaleDateString()`
* will produce `'8/13/1800'`.
*
* TODO(mmalerba): drop this variable. It's not being used in the code right now. We're now
* getting the string representation of a Date object from its utc representation. We're keeping
* it here for sometime, just for precaution, in case we decide to revert some of these changes
* though.
*/
this.useUtcForDisplay = true;
super.setLocale(matDateLocale);
// IE does its own time zone correction, so we disable this on IE.
this.useUtcForDisplay = !platform.TRIDENT;
this._clampDate = platform.TRIDENT || platform.EDGE;
}
/**
* @param {?} date
* @return {?}
*/
getYear(date) {
return date.getFullYear();
}
/**
* @param {?} date
* @return {?}
*/
getMonth(date) {
return date.getMonth();
}
/**
* @param {?} date
* @return {?}
*/
getDate(date) {
return date.getDate();
}
/**
* @param {?} date
* @return {?}
*/
getDayOfWeek(date) {
return date.getDay();
}
/**
* @param {?} style
* @return {?}
*/
getMonthNames(style) {
if (SUPPORTS_INTL_API) {
/** @type {?} */
const dtf = new Intl.DateTimeFormat(this.locale, { month: style, timeZone: 'utc' });
return range(12, (/**
* @param {?} i
* @return {?}
*/
i => this._stripDirectionalityCharacters(this._format(dtf, new Date(2017, i, 1)))));
}
return DEFAULT_MONTH_NAMES[style];
}
/**
* @return {?}
*/
getDateNames() {
if (SUPPORTS_INTL_API) {
/** @type {?} */
const dtf = new Intl.DateTimeFormat(this.locale, { day: 'numeric', timeZone: 'utc' });
return range(31, (/**
* @param {?} i
* @return {?}
*/
i => this._stripDirectionalityCharacters(this._format(dtf, new Date(2017, 0, i + 1)))));
}
return DEFAULT_DATE_NAMES;
}
/**
* @param {?} style
* @return {?}
*/
getDayOfWeekNames(style) {
if (SUPPORTS_INTL_API) {
/** @type {?} */
const dtf = new Intl.DateTimeFormat(this.locale, { weekday: style, timeZone: 'utc' });
return range(7, (/**
* @param {?} i
* @return {?}
*/
i => this._stripDirectionalityCharacters(this._format(dtf, new Date(2017, 0, i + 1)))));
}
return DEFAULT_DAY_OF_WEEK_NAMES[style];
}
/**
* @param {?} date
* @return {?}
*/
getYearName(date) {
if (SUPPORTS_INTL_API) {
/** @type {?} */
const dtf = new Intl.DateTimeFormat(this.locale, { year: 'numeric', timeZone: 'utc' });
return this._stripDirectionalityCharacters(this._format(dtf, date));
}
return String(this.getYear(date));
}
/**
* @return {?}
*/
getFirstDayOfWeek() {
// We can't tell using native JS Date what the first day of the week is, we default to Sunday.
return 0;
}
/**
* @param {?} date
* @return {?}
*/
getNumDaysInMonth(date) {
return this.getDate(this._createDateWithOverflow(this.getYear(date), this.getMonth(date) + 1, 0));
}
/**
* @param {?} date
* @return {?}
*/
clone(date) {
return new Date(date.getTime());
}
/**
* @param {?} year
* @param {?} month
* @param {?} date
* @return {?}
*/
createDate(year, month, date) {
// Check for invalid month and date (except upper bound on date which we have to check after
// creating the Date).
if (month < 0 || month > 11) {
throw Error(`Invalid month index "${month}". Month index has to be between 0 and 11.`);
}
if (date < 1) {
throw Error(`Invalid date "${date}". Date has to be greater than 0.`);
}
/** @type {?} */
let result = this._createDateWithOverflow(year, month, date);
// Check that the date wasn't above the upper bound for the month, causing the month to overflow
if (result.getMonth() != month) {
throw Error(`Invalid date "${date}" for month with index "${month}".`);
}
return result;
}
/**
* @return {?}
*/
today() {
return new Date();
}
/**
* @param {?} value
* @return {?}
*/
parse(value) {
// We have no way using the native JS Date to set the parse format or locale, so we ignore these
// parameters.
if (typeof value == 'number') {
return new Date(value);
}
return value ? new Date(Date.parse(value)) : null;
}
/**
* @param {?} date
* @param {?} displayFormat
* @return {?}
*/
format(date, displayFormat) {
if (!this.isValid(date)) {
throw Error('NativeDateAdapter: Cannot format invalid date.');
}
if (SUPPORTS_INTL_API) {
// On IE and Edge the i18n API will throw a hard error that can crash the entire app
// if we attempt to format a date whose year is less than 1 or greater than 9999.
if (this._clampDate && (date.getFullYear() < 1 || date.getFullYear() > 9999)) {
date = this.clone(date);
date.setFullYear(Math.max(1, Math.min(9999, date.getFullYear())));
}
displayFormat = Object.assign(Object.assign({}, displayFormat), { timeZone: 'utc' });
/** @type {?} */
const dtf = new Intl.DateTimeFormat(this.locale, displayFormat);
return this._stripDirectionalityCharacters(this._format(dtf, date));
}
return this._stripDirectionalityCharacters(date.toDateString());
}
/**
* @param {?} date
* @param {?} years
* @return {?}
*/
addCalendarYears(date, years) {
return this.addCalendarMonths(date, years * 12);
}
/**
* @param {?} date
* @param {?} months
* @return {?}
*/
addCalendarMonths(date, months) {
/** @type {?} */
let newDate = this._createDateWithOverflow(this.getYear(date), this.getMonth(date) + months, this.getDate(date));
// It's possible to wind up in the wrong month if the original month has more days than the new
// month. In this case we want to go to the last day of the desired month.
// Note: the additional + 12 % 12 ensures we end up with a positive number, since JS % doesn't
// guarantee this.
if (this.getMonth(newDate) != ((this.getMonth(date) + months) % 12 + 12) % 12) {
newDate = this._createDateWithOverflow(this.getYear(newDate), this.getMonth(newDate), 0);
}
return newDate;
}
/**
* @param {?} date
* @param {?} days
* @return {?}
*/
addCalendarDays(date, days) {
return this._createDateWithOverflow(this.getYear(date), this.getMonth(date), this.getDate(date) + days);
}
/**
* @param {?} date
* @return {?}
*/
toIso8601(date) {
return [
date.getUTCFullYear(),
this._2digit(date.getUTCMonth() + 1),
this._2digit(date.getUTCDate())
].join('-');
}
/**
* Returns the given value if given a valid Date or null. Deserializes valid ISO 8601 strings
* (https://www.ietf.org/rfc/rfc3339.txt) into valid Dates and empty string into null. Returns an
* invalid date for all other values.
* @param {?} value
* @return {?}
*/
deserialize(value) {
if (typeof value === 'string') {
if (!value) {
return null;
}
// The `Date` constructor accepts formats other than ISO 8601, so we need to make sure the
// string is the right format first.
if (ISO_8601_REGEX.test(value)) {
/** @type {?} */
let date = new Date(value);
if (this.isValid(date)) {
return date;
}
}
}
return super.deserialize(value);
}
/**
* @param {?} obj
* @return {?}
*/
isDateInstance(obj) {
return obj instanceof Date;
}
/**
* @param {?} date
* @return {?}
*/
isValid(date) {
return !isNaN(date.getTime());
}
/**
* @return {?}
*/
invalid() {
return new Date(NaN);
}
/**
* Creates a date but allows the month and date to overflow.
* @private
* @param {?} year
* @param {?} month
* @param {?} date
* @return {?}
*/
_createDateWithOverflow(year, month, date) {
/** @type {?} */
const result = new Date(year, month, date);
// We need to correct for the fact that JS native Date treats years in range [0, 99] as
// abbreviations for 19xx.
if (year >= 0 && year < 100) {
result.setFullYear(this.getYear(result) - 1900);
}
return result;
}
/**
* Pads a number to make it two digits.
* @private
* @param {?} n The number to pad.
* @return {?} The padded number.
*/
_2digit(n) {
return ('00' + n).slice(-2);
}
/**
* Strip out unicode LTR and RTL characters. Edge and IE insert these into formatted dates while
* other browsers do not. We remove them to make output consistent and because they interfere with
* date parsing.
* @private
* @param {?} str The string to strip direction characters from.
* @return {?} The stripped string.
*/
_stripDirectionalityCharacters(str) {
return str.replace(/[\u200e\u200f]/g, '');
}
/**
* When converting Date object to string, javascript built-in functions may return wrong
* results because it applies its internal DST rules. The DST rules around the world change
* very frequently, and the current valid rule is not always valid in previous years though.
* We work around this problem building a new Date object which has its internal UTC
* representation with the local date and time.
* @private
* @param {?} dtf Intl.DateTimeFormat object, containg the desired string format. It must have
* timeZone set to 'utc' to work fine.
* @param {?} date Date from which we want to get the string representation according to dtf
* @return {?} A Date object with its UTC representation based on the passed in date info
*/
_format(dtf, date) {
/** @type {?} */
const d = new Date(Date.UTC(date.getFullYear(), date.getMonth(), date.getDate(), date.getHours(), date.getMinutes(), date.getSeconds(), date.getMilliseconds()));
return dtf.format(d);
}
}
NativeDateAdapter.decorators = [
{ type: Injectable }
];
/** @nocollapse */
NativeDateAdapter.ctorParameters = () => [
{ type: String, decorators: [{ type: Optional }, { type: Inject, args: [MAT_DATE_LOCALE,] }] },
{ type: Platform }
];
if (false) {
/**
* Whether to clamp the date between 1 and 9999 to avoid IE and Edge errors.
* @type {?}
* @private
*/
NativeDateAdapter.prototype._clampDate;
/**
* Whether to use `timeZone: 'utc'` with `Intl.DateTimeFormat` when formatting dates.
* Without this `Intl.DateTimeFormat` sometimes chooses the wrong timeZone, which can throw off
* the result. (e.g. in the en-US locale `new Date(1800, 7, 14).toLocaleDateString()`
* will produce `'8/13/1800'`.
*
* TODO(mmalerba): drop this variable. It's not being used in the code right now. We're now
* getting the string representation of a Date object from its utc representation. We're keeping
* it here for sometime, just for precaution, in case we decide to revert some of these changes
* though.
* @type {?}
*/
NativeDateAdapter.prototype.useUtcForDisplay;
}
export { ɵ0 };
//# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Platform} from '@angular/cdk/platform';\nimport {Inject, Injectable, Optional} from '@angular/core';\nimport {DateAdapter, MAT_DATE_LOCALE} from './date-adapter';\n\n// TODO(mmalerba): Remove when we no longer support safari 9.\n/** Whether the browser supports the Intl API. */\nlet SUPPORTS_INTL_API: boolean;\n\n// We need a try/catch around the reference to `Intl`, because accessing it in some cases can\n// cause IE to throw. These cases are tied to particular versions of Windows and can happen if\n// the consumer is providing a polyfilled `Map`. See:\n// https://github.com/Microsoft/ChakraCore/issues/3189\n// https://github.com/angular/components/issues/15687\ntry {\n  SUPPORTS_INTL_API = typeof Intl != 'undefined';\n} catch {\n  SUPPORTS_INTL_API = false;\n}\n\n/** The default month names to use if Intl API is not available. */\nconst DEFAULT_MONTH_NAMES = {\n  'long': [\n    'January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September',\n    'October', 'November', 'December'\n  ],\n  'short': ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],\n  'narrow': ['J', 'F', 'M', 'A', 'M', 'J', 'J', 'A', 'S', 'O', 'N', 'D']\n};\n\n\n/** The default date names to use if Intl API is not available. */\nconst DEFAULT_DATE_NAMES = range(31, i => String(i + 1));\n\n\n/** The default day of the week names to use if Intl API is not available. */\nconst DEFAULT_DAY_OF_WEEK_NAMES = {\n  'long': ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],\n  'short': ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],\n  'narrow': ['S', 'M', 'T', 'W', 'T', 'F', 'S']\n};\n\n\n/**\n * Matches strings that have the form of a valid RFC 3339 string\n * (https://tools.ietf.org/html/rfc3339). Note that the string may not actually be a valid date\n * because the regex will match strings an with out of bounds month, date, etc.\n */\nconst ISO_8601_REGEX =\n    /^\\d{4}-\\d{2}-\\d{2}(?:T\\d{2}:\\d{2}:\\d{2}(?:\\.\\d+)?(?:Z|(?:(?:\\+|-)\\d{2}:\\d{2}))?)?$/;\n\n\n/** Creates an array and fills it with values. */\nfunction range<T>(length: number, valueFunction: (index: number) => T): T[] {\n  const valuesArray = Array(length);\n  for (let i = 0; i < length; i++) {\n    valuesArray[i] = valueFunction(i);\n  }\n  return valuesArray;\n}\n\n/** Adapts the native JS Date for use with cdk-based components that work with dates. */\n@Injectable()\nexport class NativeDateAdapter extends DateAdapter<Date> {\n  /** Whether to clamp the date between 1 and 9999 to avoid IE and Edge errors. */\n  private readonly _clampDate: boolean;\n\n  /**\n   * Whether to use `timeZone: 'utc'` with `Intl.DateTimeFormat` when formatting dates.\n   * Without this `Intl.DateTimeFormat` sometimes chooses the wrong timeZone, which can throw off\n   * the result. (e.g. in the en-US locale `new Date(1800, 7, 14).toLocaleDateString()`\n   * will produce `'8/13/1800'`.\n   *\n   * TODO(mmalerba): drop this variable. It's not being used in the code right now. We're now\n   * getting the string representation of a Date object from its utc representation. We're keeping\n   * it here for sometime, just for precaution, in case we decide to revert some of these changes\n   * though.\n   */\n  useUtcForDisplay: boolean = true;\n\n  constructor(@Optional() @Inject(MAT_DATE_LOCALE) matDateLocale: string, platform: Platform) {\n    super();\n    super.setLocale(matDateLocale);\n\n    // IE does its own time zone correction, so we disable this on IE.\n    this.useUtcForDisplay = !platform.TRIDENT;\n    this._clampDate = platform.TRIDENT || platform.EDGE;\n  }\n\n  getYear(date: Date): number {\n    return date.getFullYear();\n  }\n\n  getMonth(date: Date): number {\n    return date.getMonth();\n  }\n\n  getDate(date: Date): number {\n    return date.getDate();\n  }\n\n  getDayOfWeek(date: Date): number {\n    return date.getDay();\n  }\n\n  getMonthNames(style: 'long' | 'short' | 'narrow'): string[] {\n    if (SUPPORTS_INTL_API) {\n      const dtf = new Intl.DateTimeFormat(this.locale, {month: style, timeZone: 'utc'});\n      return range(12, i =>\n          this._stripDirectionalityCharacters(this._format(dtf, new Date(2017, i, 1))));\n    }\n    return DEFAULT_MONTH_NAMES[style];\n  }\n\n  getDateNames(): string[] {\n    if (SUPPORTS_INTL_API) {\n      const dtf = new Intl.DateTimeFormat(this.locale, {day: 'numeric', timeZone: 'utc'});\n      return range(31, i => this._stripDirectionalityCharacters(\n          this._format(dtf, new Date(2017, 0, i + 1))));\n    }\n    return DEFAULT_DATE_NAMES;\n  }\n\n  getDayOfWeekNames(style: 'long' | 'short' | 'narrow'): string[] {\n    if (SUPPORTS_INTL_API) {\n      const dtf = new Intl.DateTimeFormat(this.locale, {weekday: style, timeZone: 'utc'});\n      return range(7, i => this._stripDirectionalityCharacters(\n          this._format(dtf, new Date(2017, 0, i + 1))));\n    }\n    return DEFAULT_DAY_OF_WEEK_NAMES[style];\n  }\n\n  getYearName(date: Date): string {\n    if (SUPPORTS_INTL_API) {\n      const dtf = new Intl.DateTimeFormat(this.locale, {year: 'numeric', timeZone: 'utc'});\n      return this._stripDirectionalityCharacters(this._format(dtf, date));\n    }\n    return String(this.getYear(date));\n  }\n\n  getFirstDayOfWeek(): number {\n    // We can't tell using native JS Date what the first day of the week is, we default to Sunday.\n    return 0;\n  }\n\n  getNumDaysInMonth(date: Date): number {\n    return this.getDate(this._createDateWithOverflow(\n        this.getYear(date), this.getMonth(date) + 1, 0));\n  }\n\n  clone(date: Date): Date {\n    return new Date(date.getTime());\n  }\n\n  createDate(year: number, month: number, date: number): Date {\n    // Check for invalid month and date (except upper bound on date which we have to check after\n    // creating the Date).\n    if (month < 0 || month > 11) {\n      throw Error(`Invalid month index \"${month}\". Month index has to be between 0 and 11.`);\n    }\n\n    if (date < 1) {\n      throw Error(`Invalid date \"${date}\". Date has to be greater than 0.`);\n    }\n\n    let result = this._createDateWithOverflow(year, month, date);\n    // Check that the date wasn't above the upper bound for the month, causing the month to overflow\n    if (result.getMonth() != month) {\n      throw Error(`Invalid date \"${date}\" for month with index \"${month}\".`);\n    }\n\n    return result;\n  }\n\n  today(): Date {\n    return new Date();\n  }\n\n  parse(value: any): Date | null {\n    // We have no way using the native JS Date to set the parse format or locale, so we ignore these\n    // parameters.\n    if (typeof value == 'number') {\n      return new Date(value);\n    }\n    return value ? new Date(Date.parse(value)) : null;\n  }\n\n  format(date: Date, displayFormat: Object): string {\n    if (!this.isValid(date)) {\n      throw Error('NativeDateAdapter: Cannot format invalid date.');\n    }\n\n    if (SUPPORTS_INTL_API) {\n      // On IE and Edge the i18n API will throw a hard error that can crash the entire app\n      // if we attempt to format a date whose year is less than 1 or greater than 9999.\n      if (this._clampDate && (date.getFullYear() < 1 || date.getFullYear() > 9999)) {\n        date = this.clone(date);\n        date.setFullYear(Math.max(1, Math.min(9999, date.getFullYear())));\n      }\n\n      displayFormat = {...displayFormat, timeZone: 'utc'};\n\n      const dtf = new Intl.DateTimeFormat(this.locale, displayFormat);\n      return this._stripDirectionalityCharacters(this._format(dtf, date));\n    }\n    return this._stripDirectionalityCharacters(date.toDateString());\n  }\n\n  addCalendarYears(date: Date, years: number): Date {\n    return this.addCalendarMonths(date, years * 12);\n  }\n\n  addCalendarMonths(date: Date, months: number): Date {\n    let newDate = this._createDateWithOverflow(\n        this.getYear(date), this.getMonth(date) + months, this.getDate(date));\n\n    // It's possible to wind up in the wrong month if the original month has more days than the new\n    // month. In this case we want to go to the last day of the desired month.\n    // Note: the additional + 12 % 12 ensures we end up with a positive number, since JS % doesn't\n    // guarantee this.\n    if (this.getMonth(newDate) != ((this.getMonth(date) + months) % 12 + 12) % 12) {\n      newDate = this._createDateWithOverflow(this.getYear(newDate), this.getMonth(newDate), 0);\n    }\n\n    return newDate;\n  }\n\n  addCalendarDays(date: Date, days: number): Date {\n    return this._createDateWithOverflow(\n        this.getYear(date), this.getMonth(date), this.getDate(date) + days);\n  }\n\n  toIso8601(date: Date): string {\n    return [\n      date.getUTCFullYear(),\n      this._2digit(date.getUTCMonth() + 1),\n      this._2digit(date.getUTCDate())\n    ].join('-');\n  }\n\n  /**\n   * Returns the given value if given a valid Date or null. Deserializes valid ISO 8601 strings\n   * (https://www.ietf.org/rfc/rfc3339.txt) into valid Dates and empty string into null. Returns an\n   * invalid date for all other values.\n   */\n  deserialize(value: any): Date | null {\n    if (typeof value === 'string') {\n      if (!value) {\n        return null;\n      }\n      // The `Date` constructor accepts formats other than ISO 8601, so we need to make sure the\n      // string is the right format first.\n      if (ISO_8601_REGEX.test(value)) {\n        let date = new Date(value);\n        if (this.isValid(date)) {\n          return date;\n        }\n      }\n    }\n    return super.deserialize(value);\n  }\n\n  isDateInstance(obj: any) {\n    return obj instanceof Date;\n  }\n\n  isValid(date: Date) {\n    return !isNaN(date.getTime());\n  }\n\n  invalid(): Date {\n    return new Date(NaN);\n  }\n\n  /** Creates a date but allows the month and date to overflow. */\n  private _createDateWithOverflow(year: number, month: number, date: number) {\n    const result = new Date(year, month, date);\n\n    // We need to correct for the fact that JS native Date treats years in range [0, 99] as\n    // abbreviations for 19xx.\n    if (year >= 0 && year < 100) {\n      result.setFullYear(this.getYear(result) - 1900);\n    }\n    return result;\n  }\n\n  /**\n   * Pads a number to make it two digits.\n   * @param n The number to pad.\n   * @returns The padded number.\n   */\n  private _2digit(n: number) {\n    return ('00' + n).slice(-2);\n  }\n\n  /**\n   * Strip out unicode LTR and RTL characters. Edge and IE insert these into formatted dates while\n   * other browsers do not. We remove them to make output consistent and because they interfere with\n   * date parsing.\n   * @param str The string to strip direction characters from.\n   * @returns The stripped string.\n   */\n  private _stripDirectionalityCharacters(str: string) {\n    return str.replace(/[\\u200e\\u200f]/g, '');\n  }\n\n  /**\n   * When converting Date object to string, javascript built-in functions may return wrong\n   * results because it applies its internal DST rules. The DST rules around the world change\n   * very frequently, and the current valid rule is not always valid in previous years though.\n   * We work around this problem building a new Date object which has its internal UTC\n   * representation with the local date and time.\n   * @param dtf Intl.DateTimeFormat object, containg the desired string format. It must have\n   *    timeZone set to 'utc' to work fine.\n   * @param date Date from which we want to get the string representation according to dtf\n   * @returns A Date object with its UTC representation based on the passed in date info\n   */\n  private _format(dtf: Intl.DateTimeFormat, date: Date) {\n    const d = new Date(Date.UTC(\n        date.getFullYear(), date.getMonth(), date.getDate(), date.getHours(),\n        date.getMinutes(), date.getSeconds(), date.getMilliseconds()));\n    return dtf.format(d);\n  }\n}\n"]}