export declare function getTzMinutesOffset(oldTz: string, newTz: string): number;
export declare function formatMinutesOffset(offsetMins: number): string;
export declare function getTimezoneLabel(timezone: string | undefined): string | undefined;
export declare function getHumanReadableCronExpression(cronExpression: string, timezone: string): string;
export declare function isValidFrequency(cronExpression: string): boolean;
export declare function isValidTimezone(timezone: string | undefined): boolean;
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