export declare function isPotentiallyUnsafeDate(mixed: any): mixed is Date;
export declare function isValidDate(mixed: any): mixed is Date;
export declare function isBefore(mixed: any, x: Date): mixed is Date;
export declare function isAfter(mixed: any, x: Date): mixed is Date;
export declare function isBeforeOrAt(mixed: any, x: Date): mixed is Date;
export declare function isAfterOrAt(mixed: any, x: Date): mixed is Date;
export declare function isRange(mixed: any, args: {
    min?: Date;
    max?: Date;
}): mixed is Date;