import { Maybe } from '../../graphql-schema';
export declare const DAY_MS: number;
export declare const HOUR_MS: number;
export declare const MINUTES_MS: number;
export declare const HOURS_MS: number;
export declare const getNowMS: () => number;
export declare const getTimeMS: (date: Date) => number;
export declare const getDiffFromNowMs: (date: Date) => number;
export declare const isToday: (date: Date) => boolean;
export declare const isYesterday: (date: Date) => boolean;
export declare const getLessonDuration: ({ duration, hasBioBreak, }: {
    duration: number;
    hasBioBreak?: boolean | undefined;
}) => {
    durationMin: number;
    durationMs: number;
};
export declare const getIsLessonStarted: ({ datetime }: {
    datetime: Date;
}) => boolean;
export declare const getIsLessonAlmostStarted: ({ datetime }: {
    datetime: Date;
}) => boolean;
export declare const getIsLessonAlmostFinished: ({ datetime, lessonDurationMs, advancedTimeToFinishMs, }: {
    datetime: Date;
    lessonDurationMs: number;
    advancedTimeToFinishMs?: number | undefined;
}) => boolean;
export declare const getIsLessonFinished: ({ datetime, lessonDurationMs, withNoExtraTimeAfterLessonEnd, }: {
    datetime: Date;
    lessonDurationMs: number;
    withNoExtraTimeAfterLessonEnd?: boolean | undefined;
}) => boolean;
declare type UserNodeWithTimezone = {
    profile: Maybe<{
        timezone: Maybe<{
            tzname: string;
        }>;
    }>;
};
export declare const getDefaultTimezone: () => string;
export declare const getUserTimezone: (user: UserNodeWithTimezone | null) => string;
export declare const toZonedDate: (date: Date, timeZone: string) => Date;
export {};
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