/**
 * Date formatting utilities for Instantly API
 */
/**
 * Helper function to format dates for Instantly API (YYYY-MM-DD format)
 */
export declare function formatDateForApi(dateInput: any): string;
/**
 * Helper function to format dates for Instantly API campaign dates (ISO 8601 datetime format)
 * Used for campaign start_date and end_date which require full datetime format
 */
export declare function formatDateTimeForApi(dateInput: any): string;
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