import * as moment from "moment-timezone";
import { FormGroup, FormControl } from "@angular/forms";
export declare type FormatDateTzOptions = {
    format?: string;
    timezone?: string;
};
export declare type InitDateTzOptions = {
    date?: moment.Moment | string;
    startOf?: moment.unitOfTime.StartOf;
    timezone?: string;
};
export declare class TimezoneUtils {
    static formatDateString(dateString: string, format?: string): string;
    static formatMomentDate(date: moment.Moment, format?: string): string;
    static formatDateStringTz(dateString: string, options?: FormatDateTzOptions): string;
    static convertToTz(date: string | moment.Moment, timezone?: string): moment.Moment;
    static convertTzToUtc(momentDate: moment.Moment): moment.Moment;
    static convertTzToUtcString(momentDate: moment.Moment): string;
    static formDateChange(newDate: moment.Moment, f: FormGroup, fieldName: string, timezone?: string): boolean;
    static formControlDateChange(newDate: moment.Moment, control: FormControl, timezone?: string): boolean;
    static initDateToTz(params?: InitDateTzOptions): moment.Moment;
    static changeTimeZoneWithoutShiftingDateTime(newDate: moment.Moment, timezone?: string): string;
}