/**
 * Adds a specified number of days to a date
 * @param date The date to add days to
 * @param days The number of days to add
 * @returns A new date with the days added
 */
export declare function addDays(date: Date, days: number): Date;
/**
 * Adds a specified number of minutes to a date
 * @param date The date to add minutes to
 * @param minutes The number of minutes to add
 * @returns A new date with the minutes added
 */
export declare function addMinutes(date: Date, minutes: number): Date;
/**
 * Adds a specified number of seconds to a date
 * @param date The date to add seconds to
 * @param seconds The number of seconds to add
 * @returns A new date with the seconds added
 */
export declare function addSeconds(date: Date, seconds: number): Date;
/**
 * Rounds a date to the nearest minute
 * @param date The date to round
 * @returns A new date rounded to the nearest minute
 */
export declare function roundToNearestMinute(date: Date): Date;
/**
 * Gets the day of the year (1-366)
 * @param date The date
 * @returns The day of the year
 */
export declare function dayOfYear(date: Date): number;
/**
 * Checks if a year is a leap year
 * @param year The year
 * @returns Whether the year is a leap year
 */
export declare function isLeapYear(year: number): boolean;
/**
 * Gets the hours and minutes from a decimal hour
 * @param decimalHour The decimal hour (e.g., 12.5 for 12:30)
 * @returns An object with hours and minutes
 */
export declare function hoursMinutesFromDecimal(decimalHour: number): {
    hours: number;
    minutes: number;
};
/**
 * Formats a date in HH:MM format
 * @param date The date to format
 * @returns The formatted time string
 */
export declare function formatTime(date: Date): string;
/**
 * Formats a date in 12-hour format with AM/PM
 * @param date The date to format
 * @returns The formatted time string
 */
export declare function formatTime12Hour(date: Date): string;