export declare function isNotNull(value: any): boolean;
export declare function toBoolean(value: boolean | string): boolean;
export declare function convertToDate(value: string, format?: string): Date | undefined;
export declare function convertToString(date: Date | undefined, format?: string, selected12Hours?: string): string;
export declare function addZero(val: any): any;
export declare function getRealFormat(format: string, use12Hours: boolean): string;