export declare class EffectiveTimeRange {
    private 'start_time'?;
    private 'end_time'?;
    constructor();
    withStartTime(startTime: string): EffectiveTimeRange;
    set startTime(startTime: string | undefined);
    get startTime(): string | undefined;
    withEndTime(endTime: string): EffectiveTimeRange;
    set endTime(endTime: string | undefined);
    get endTime(): string | undefined;
}
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