/**
 * Format a Date using UTC calendar components (YYYY-MM-DD).
 */
export declare function formatUtcDate(date: Date): string;
/**
 * Parse a GMT offset string (+HH:MM or -HH:MM) to total minutes.
 * Falls back to 0 for malformed offsets.
 */
export declare function parseGmtOffsetToMinutes(gmtOffset: string): number;
/**
 * Return the date string (YYYY-MM-DD) in a provided GMT offset.
 */
export declare function getDateInOffset(date: Date, offsetMinutes: number): string;
/**
 * Shift a YYYY-MM-DD date string by the specified number of days in UTC.
 */
export declare function shiftDateStringByDays(dateString: string, days: number): string;
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