/**
 * a date helper that is not relying on SharePoint or any utils at all
 * can be synced to the server code and external projects
 * do not add code that needs SP or utils -> move it to utils/date
 */
export declare function isISODateUTC(d: string): boolean;
export declare function isISODate(d: string): boolean;
export declare function isStandardDate(d: string): boolean;
export declare function parseISODate(a: string): Date | null;
/** Get now date, without seconds or milliseconds. */
export declare function getNow(): Date;
/** Get today date, without hours, minutes, seconds or milliseconds. */
export declare function getToday(): Date;
export declare enum DateFormats {
    YMD = "yyyy-MM-dd"
}
export declare function changeDate(options: {
    years?: number;
    months?: number;
    days?: number;
    hours?: number;
    minutes?: number;
}, startDate?: Date): Date;
export declare function cloneDate(date: Date): Date;
/** Returns a new date object adjusted for the time format */
export declare function getDateFromToken(str: string, options?: {
    now?: Date;
    zeroTimeForToday?: boolean;
}): Date;
export declare function isTodayToken(str: string): boolean;
export declare function isNowToken(str: string): boolean;
/** Get the number of seconds from date (in the past) to now */
export declare function getSecondsElapsed(from: Date): number;
/** Get the total number of days in a given month specified by a date object  */
export declare function getTotalDaysInMonth(obj: Date): number;
/** Shifts the date by a certain number of months and takes into account the total number of days in the new month.
 * For example, if you shift January 31st by one month it will return February 28th (29th for a leap year) instead of March 3rd (2nd in leap year)
  */
export declare function shiftMonths(obj: Date, months: number): void;
/**
 * Gets last day of month given a date
  */
export declare function getLastDayOfMonth(obj: Date): Date;
export declare function getRelativeTime(d1: Date, d2?: Date): string;