import { OnInit, ChangeDetectorRef, EventEmitter } from '@angular/core';
import { Survey } from '../../../../classes';
import { NgModel, FormGroup } from '@angular/forms';
import { Subscription } from 'rxjs';
import { DateToTimePipe } from '../../../shared';
export declare class HeaderComponent implements OnInit {
    private cdRef;
    private dateToTimePipe;
    survey: Survey;
    onSave: EventEmitter<{}>;
    composeFormGroup: FormGroup;
    open_at: NgModel;
    close_at: NgModel;
    minDate: Date;
    maxDate: Date;
    subscriptions: Subscription[];
    constructor(cdRef: ChangeDetectorRef, dateToTimePipe: DateToTimePipe);
    ngOnInit(): void;
    ngOnDestroy(): void;
    private addControls;
    private removeControls;
    dateToTime(date: Date): number;
    save(): void;
}