/**
 * Gregorian calendar utility functions
 */
/**
 * Checks if a given Gregorian year is a leap year
 */
export declare const isGregorianLeapYear: (year: number) => boolean;
/**
 * Gets the number of days in a Gregorian month
 */
export declare const getGregorianMonthDays: (year: number, month: number) => number;
/**
 * Converts Gregorian date to Julian Day Number
 */
export declare const gregorianToJDN: (year: number, month: number, day: number) => number;
/**
 * Converts Julian Day Number to Gregorian date
 */
export declare const jdnToGregorian: (jdn: number) => [number, number, number];
/**
 * Validates a Gregorian date
 */
export declare const isValidGregorianDate: (year: number, month: number, day: number) => boolean;
/**
 * Gets the name of a Gregorian month
 */
export declare const getGregorianMonthName: (month: number) => string;
/**
 * Gets today's date in Gregorian calendar
 */
export declare const getCurrentGregorianDate: () => [number, number, number];