import { Observable } from 'rxjs';
import * as i0 from "@angular/core";
export declare const MINUTE = 60;
export declare const HOUR: number;
export declare const DAY: number;
export declare class TimeAgoService {
    constructor();
    tick(then: number): Observable<any>;
    static ɵfac: i0.ɵɵFactoryDeclaration<TimeAgoService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<TimeAgoService>;
}