diff --git a/date.format.js/date.format.d.ts b/date.format.js/date.format.d.ts
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+++ b/date.format.js/date.format.d.ts
@@ -0,0 +1,203 @@
+/******************************************************************************
+ Portions Copyright (c) Microsoft Corporation. All rights reserved.
+
+ Licensed under the Apache License, Version 2.0 (the "License"); you may not use
+ this file except in compliance with the License. You may obtain a copy of the
+ License at http://www.apache.org/licenses/LICENSE-2.0
+
+ THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
+ WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
+ MERCHANTABLITY OR NON-INFRINGEMENT.
+
+ See the Apache Version 2.0 License for specific language governing permissions
+ and limitations under the License.
+ ***************************************************************************** */
+
+// Typing for the date.format.js from Steven Levithan
+// reproduces "Date" and adds format() - seemed to be the only way ...
+
+/** Enables basic storage and retrieval of dates and times. */
+interface Date {
+  /** Returns a string representation of a date. The format of the string depends on the locale. */
+  toString(): string;
+  /** Returns a date as a string value. */
+  toDateString(): string;
+  /** Returns a time as a string value. */
+  toTimeString(): string;
+  /** Returns a value as a string value appropriate to the host environment's current locale. */
+  toLocaleString(): string;
+  /** Returns a date as a string value appropriate to the host environment's current locale. */
+  toLocaleDateString(): string;
+  /** Returns a time as a string value appropriate to the host environment's current locale. */
+  toLocaleTimeString(): string;
+  /** Returns the stored time value in milliseconds since midnight, January 1, 1970 UTC. */
+  valueOf(): number;
+  /** Gets the time value in milliseconds. */
+  getTime(): number;
+  /** Gets the year, using local time. */
+  getFullYear(): number;
+  /** Gets the year using Universal Coordinated Time (UTC). */
+  getUTCFullYear(): number;
+  /** Gets the month, using local time. */
+  getMonth(): number;
+  /** Gets the month of a Date object using Universal Coordinated Time (UTC). */
+  getUTCMonth(): number;
+  /** Gets the day-of-the-month, using local time. */
+  getDate(): number;
+  /** Gets the day-of-the-month, using Universal Coordinated Time (UTC). */
+  getUTCDate(): number;
+  /** Gets the day of the week, using local time. */
+  getDay(): number;
+  /** Gets the day of the week using Universal Coordinated Time (UTC). */
+  getUTCDay(): number;
+  /** Gets the hours in a date, using local time. */
+  getHours(): number;
+  /** Gets the hours value in a Date object using Universal Coordinated Time (UTC). */
+  getUTCHours(): number;
+  /** Gets the minutes of a Date object, using local time. */
+  getMinutes(): number;
+  /** Gets the minutes of a Date object using Universal Coordinated Time (UTC). */
+  getUTCMinutes(): number;
+  /** Gets the seconds of a Date object, using local time. */
+  getSeconds(): number;
+  /** Gets the seconds of a Date object using Universal Coordinated Time (UTC). */
+  getUTCSeconds(): number;
+  /** Gets the milliseconds of a Date, using local time. */
+  getMilliseconds(): number;
+  /** Gets the milliseconds of a Date object using Universal Coordinated Time (UTC). */
+  getUTCMilliseconds(): number;
+  /** Gets the difference in minutes between the time on the local computer and Universal Coordinated Time (UTC). */
+  getTimezoneOffset(): number;
+  /**
+   * Sets the date and time value in the Date object.
+   * @param time A numeric value representing the number of elapsed milliseconds since midnight, January 1, 1970 GMT.
+   */
+  setTime(time: number): void;
+  /**
+   * Sets the milliseconds value in the Date object using local time.
+   * @param ms A numeric value equal to the millisecond value.
+   */
+  setMilliseconds(ms: number): void;
+  /**
+   * Sets the milliseconds value in the Date object using Universal Coordinated Time (UTC).
+   * @param ms A numeric value equal to the millisecond value.
+   */
+  setUTCMilliseconds(ms: number): void;
+
+  /**
+   * Sets the seconds value in the Date object using local time.
+   * @param sec A numeric value equal to the seconds value.
+   * @param ms A numeric value equal to the milliseconds value.
+   */
+  setSeconds(sec: number, ms?: number): void;
+  /**
+   * Sets the seconds value in the Date object using Universal Coordinated Time (UTC).
+   * @param sec A numeric value equal to the seconds value.
+   * @param ms A numeric value equal to the milliseconds value.
+   */
+  setUTCSeconds(sec: number, ms?: number): void;
+  /**
+   * Sets the minutes value in the Date object using local time.
+   * @param min A numeric value equal to the minutes value.
+   * @param sec A numeric value equal to the seconds value.
+   * @param ms A numeric value equal to the milliseconds value.
+   */
+  setMinutes(min: number, sec?: number, ms?: number): void;
+  /**
+   * Sets the minutes value in the Date object using Universal Coordinated Time (UTC).
+   * @param min A numeric value equal to the minutes value.
+   * @param sec A numeric value equal to the seconds value.
+   * @param ms A numeric value equal to the milliseconds value.
+   */
+  setUTCMinutes(min: number, sec?: number, ms?: number): void;
+  /**
+   * Sets the hour value in the Date object using local time.
+   * @param hours A numeric value equal to the hours value.
+   * @param min A numeric value equal to the minutes value.
+   * @param sec A numeric value equal to the seconds value.
+   * @param ms A numeric value equal to the milliseconds value.
+   */
+  setHours(hours: number, min?: number, sec?: number, ms?: number): void;
+  /**
+   * Sets the hours value in the Date object using Universal Coordinated Time (UTC).
+   * @param hours A numeric value equal to the hours value.
+   * @param min A numeric value equal to the minutes value.
+   * @param sec A numeric value equal to the seconds value.
+   * @param ms A numeric value equal to the milliseconds value.
+   */
+  setUTCHours(hours: number, min?: number, sec?: number, ms?: number): void;
+  /**
+   * Sets the numeric day-of-the-month value of the Date object using local time.
+   * @param date A numeric value equal to the day of the month.
+   */
+  setDate(date: number): void;
+  /**
+   * Sets the numeric day of the month in the Date object using Universal Coordinated Time (UTC).
+   * @param date A numeric value equal to the day of the month.
+   */
+  setUTCDate(date: number): void;
+  /**
+   * Sets the month value in the Date object using local time.
+   * @param month A numeric value equal to the month. The value for January is 0, and other month values follow consecutively.
+   * @param date A numeric value representing the day of the month. If this value is not supplied, the value from a call to the getDate method is used.
+   */
+  setMonth(month: number, date?: number): void;
+  /**
+   * Sets the month value in the Date object using Universal Coordinated Time (UTC).
+   * @param month A numeric value equal to the month. The value for January is 0, and other month values follow consecutively.
+   * @param date A numeric value representing the day of the month. If it is not supplied, the value from a call to the getUTCDate method is used.
+   */
+  setUTCMonth(month: number, date?: number): void;
+  /**
+   * Sets the year of the Date object using local time.
+   * @param year A numeric value for the year.
+   * @param month A zero-based numeric value for the month (0 for January, 11 for December). Must be specified if numDate is specified.
+   * @param date A numeric value equal for the day of the month.
+   */
+  setFullYear(year: number, month?: number, date?: number): void;
+  /**
+   * Sets the year value in the Date object using Universal Coordinated Time (UTC).
+   * @param year A numeric value equal to the year.
+   * @param month A numeric value equal to the month. The value for January is 0, and other month values follow consecutively. Must be supplied if numDate is supplied.
+   * @param date A numeric value equal to the day of the month.
+   */
+  setUTCFullYear(year: number, month?: number, date?: number): void;
+  /** Returns a date converted to a string using Universal Coordinated Time (UTC). */
+  toUTCString(): string;
+  /** Returns a date as a string value in ISO format. */
+  toISOString(): string;
+  /** Used by the JSON.stringify method to enable the transformation of an object's data for JavaScript Object Notation (JSON) serialization. */
+  toJSON(key?: any): string;
+
+  format(mask: string, utc?: boolean) : string;
+}
+
+
+declare var Date: {
+  new (): Date;
+  new (value: number): Date;
+  new (value: string): Date;
+  new (year: number, month: number, date?: number, hours?: number, minutes?: number, seconds?: number, ms?: number): Date;
+  (): string;
+  prototype: Date;
+  /**
+   * Parses a string containing a date, and returns the number of milliseconds between that date and midnight, January 1, 1970.
+   * @param s A date string
+   */
+  parse(s: string): number;
+  /**
+   * Returns the number of milliseconds between midnight, January 1, 1970 Universal Coordinated Time (UTC) (or GMT) and the specified date.
+   * @param year The full year designation is required for cross-century date accuracy. If year is between 0 and 99 is used, then year is assumed to be 1900 + year.
+   * @param month The month as an number between 0 and 11 (January to December).
+   * @param date The date as an number between 1 and 31.
+   * @param hours Must be supplied if minutes is supplied. An number from 0 to 23 (midnight to 11pm) that specifies the hour.
+   * @param minutes Must be supplied if seconds is supplied. An number from 0 to 59 that specifies the minutes.
+   * @param seconds Must be supplied if milliseconds is supplied. An number from 0 to 59 that specifies the seconds.
+   * @param ms An number from 0 to 999 that specifies the milliseconds.
+   */
+  UTC(year: number, month: number, date?: number, hours?: number, minutes?: number, seconds?: number, ms?: number): number;
+  now(): number;
+};
+
+declare function dateFormat(date?: any, mask?: string, utc?: boolean ) : string;