import { ManipulateType } from 'dayjs';
import { ISO8601Duration } from '../types/plans.types';
export declare const defaultDateFormat = "YYYY-MM-DD";
export declare const defaultDateTimeFormat = "YYYY-MM-DDTHH:mm:ss";
export declare const timestampDateFormat = "YYYY-MM-DD[T]HH:mm:ss";
export declare const altDatetimeFormat = "YYYY-MM-DDTHH:mm:ss.SSSSSS";
export declare const displayDateFormat = "MMM DD, YYYY";
export declare const setTimeOfDay: (date: string | null | undefined, time: "SOD" | "EOD", format?: string) => string | null;
export declare const getDateForDuration: (isoDuration: ISO8601Duration, anchorDate: string | null, format?: string) => string;
export declare const getPreviousMonthFirstDate: (count: number, format?: string, timeOfDay?: "SOD" | "EOD") => string | null;
/**
 * Calculates a future date based on the given parameters.
 *
 * @param {number} value - The number of units to subtract from the anchor date.
 * @param {ManipulateType} unit - The unit of time to subtract (e.g., 'day', 'month', 'year').
 * @param {string | null | undefined} [anchorDate] - The reference date for the calculation.
 *   - If undefined: Uses the current date (today) as the anchor.
 *   - If null: The function will return null.
 *   - If a valid date string: Uses this date as the anchor.
 * @param {string} [format] - The format string for the output date.
 * @param {'SOD' | 'EOD'} [timeOfDay] - Specifies whether to set the time to Start of Day (SOD) or End of Day (EOD).
 *
 * @returns {string | null}
 *   - A formatted date string representing the calculated previous date.
 *   - Null if the anchorDate parameter is explicitly set to null.
 */
export declare const getNextDate: (value: number, unit: ManipulateType, anchorDate?: string | null, format?: string, timeOfDay?: "SOD" | "EOD") => string | null;
export declare const getTodayDate: (format?: string, timeOfDay?: "SOD" | "EOD") => string;
/**
 * Converts a UTC timestamp string to a human-readable string in the user's
 * local timezone, formatted in 12-hour AM/PM format.
 *
 * @param timestamp - A UTC datetime string (e.g. "2025-07-22 13:12:09.625743")
 * @returns Formatted datetime string in local timezone (e.g. "July 22, 2025 01:12:09 PM")
 */
export declare function formatToLocalTime(timestamp?: string | null): string;