export declare class DateHelper {
    static toDate(input: any): Date;
    static toDateTime(input: any): Date;
    static convertToDate(input: any): Date;
    static addDays(date: Date, days: number): Date;
    static prettyDate(date: Date): string;
    static prettyDateTime(date: Date): string;
    static prettyTime(date: Date): string;
    static getLastSunday(): Date;
    static getNextSunday(): Date;
    static getWeekSunday(year: number, week: number): Date;
    static formatHtml5Date(date: Date | string | null | undefined): string;
    static toMysqlDateOnly(date: Date | string | null | undefined): string | null;
    static formatHtml5Time(time: Date): string;
    static formatHtml5DateTime(date: Date): string;
    static getDisplayDuration(d: Date): string;
    static getShortDate(d: Date): string;
    static convertDatePickerFormat(d: Date): Date;
    private static formatDateTime;
    static toMysqlDate(d: Date): string;
    static subtractHoursFromNow(hour: number): Date;
    static toUTCDate(d: Date): string;
}
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