/**
 * Date and timezone utilities
 */
/**
 * Converts a day string (YYYY-MM-DD) to Sunsama's panel date format
 *
 * @param day - Day in YYYY-MM-DD format
 * @param timezone - User's timezone (e.g., 'America/New_York')
 * @returns ISO date string for the start of day (midnight) in the given timezone
 *
 * @example
 * ```typescript
 * // Midnight in New York on Jan 17, 2025
 * dayToPanelDate('2025-01-17', 'America/New_York')
 * // Returns: '2025-01-17T05:00:00.000Z' (midnight EST = 5am UTC)
 * ```
 */
export declare function dayToPanelDate(day: string, timezone: string): string;
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