fix: remove ImmutableDate TS interface, accept Date

This reverts commit 6d96322.

Author: tsvetomir

src/dates.d.ts

@@ -81,63 +81,6 @@ export interface DateFormatOptions {
     timeZoneName?: 'short' | 'long';
 }
 
-/** A Date-like object that provides read-only access to the date parts. */
-export interface ImmutableDate {
-    /** 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;
-}
-
 /**
  * Converts a `Date` object to a string based on the specified format and locale.
  *
@@ -146,7 +89,7 @@ export interface ImmutableDate {
  * @param locale - The optional locale `id`. If not specified, the `id` of the `"en"` locale is used.
  * @returns - The formatted date.
  */
-export function formatDate(value: Date | ImmutableDate, format: string|DateFormatOptions, locale?: string): string;
+export function formatDate(value: Date, format: string|DateFormatOptions, locale?: string): string;
 
 /**
  * Converts a string to a `Date` object based on the specified format and locale.