/**
 * Formats timezone offset values used in for APIs, maintaining backward compatibility. Always
 * returns "+HH:MM" format, even for UTC ("+00:00"). Used by onChange events to preserve existing
 * API behavior.
 */
export declare function formatTimeOffsetISOInternal(isoDate: string, offsetInMinutes?: number): string;
/**
 * Formats timezone offset for display purposes using succinct UTC notation.
 * Returns "Z" for UTC, "+HH:MM" for other offsets.
 * Used for visual display in components like date-range-picker trigger text.
 */
export declare function formatTimeOffsetISO(isoDate: string, offsetInMinutes?: number): string;
export declare function formatTimeOffsetLocalized(isoDate: string, offsetInMinutes?: number): string;