export type ActivityTimeLike = {
    id: string | number;
    title?: string;
    startTime?: string;
    endTime?: string;
};
export type ActivityTimeFieldErrors = {
    startTime?: string;
    endTime?: string;
};
export type ActivityTimesValidationResult = {
    isValid: boolean;
    errorsByActivityId: Record<string, ActivityTimeFieldErrors>;
};
export declare const isValidActivityTimeFormat: (time?: string) => boolean;
export declare const validateActivityTimes: (activities: ActivityTimeLike[] | undefined, isAllDay: boolean, isTemplate?: boolean) => ActivityTimesValidationResult;