/**
 * ISO-string based date calculations without timezone handling.
 * All operations work on local date/time values, ignoring timezone offsets.
 */
export type DurationUnit = "seconds" | "minutes" | "hours" | "days" | "weeks" | "months" | "years";
/**
 * Parses an ISO string to a Date object.
 * Accepts formats like "2024-01-15" or "2024-01-15T14:30:00".
 */
export declare function parseISODate(isoString: string): Date;
/**
 * Formats a Date to ISO string (date only: YYYY-MM-DD).
 */
export declare function toISODateString(date: Date): string;
/**
 * Formats a Date to ISO string (datetime: YYYY-MM-DDTHH:mm:ss).
 */
export declare function toISODateTimeString(date: Date): string;
/**
 * Adds a duration to a date.
 */
export declare function addDuration(date: Date | string, amount: number, unit: DurationUnit): Date;
/**
 * Subtracts a duration from a date.
 */
export declare function subDuration(date: Date | string, amount: number, unit: DurationUnit): Date;
/**
 * Calculates the difference between two dates in the specified unit.
 */
export declare function dateDiff(dateLeft: Date | string, dateRight: Date | string, unit: DurationUnit): number;
/**
 * Gets the start of a time period.
 */
export declare function startOf(date: Date | string, unit: "day" | "week" | "month" | "year"): Date;
/**
 * Gets the end of a time period.
 */
export declare function endOf(date: Date | string, unit: "day" | "week" | "month" | "year"): Date;
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