date-fns/sub.js

import { constructFrom } from "./constructFrom.js";
import { subDays } from "./subDays.js";
import { subMonths } from "./subMonths.js";

/**
 * The {@link sub} function options.
 */

/**
 * @name sub
 * @category Common Helpers
 * @summary Subtract the specified years, months, weeks, days, hours, minutes and seconds from the given date.
 *
 * @description
 * Subtract the specified years, months, weeks, days, hours, minutes and seconds from the given date.
 *
 * @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
 * @typeParam ResultDate - The result `Date` type, it is the type returned from the context function if it is passed, or inferred from the arguments.
 *
 * @param date - The date to be changed
 * @param duration - The object with years, months, weeks, days, hours, minutes and seconds to be subtracted
 * @param options - An object with options
 *
 * | Key     | Description                        |
 * |---------|------------------------------------|
 * | years   | Amount of years to be subtracted   |
 * | months  | Amount of months to be subtracted  |
 * | weeks   | Amount of weeks to be subtracted   |
 * | days    | Amount of days to be subtracted    |
 * | hours   | Amount of hours to be subtracted   |
 * | minutes | Amount of minutes to be subtracted |
 * | seconds | Amount of seconds to be subtracted |
 *
 * All values default to 0
 *
 * @returns The new date with the seconds subtracted
 *
 * @example
 * // Subtract the following duration from 15 June 2017 15:29:20
 * const result = sub(new Date(2017, 5, 15, 15, 29, 20), {
 *   years: 2,
 *   months: 9,
 *   weeks: 1,
 *   days: 7,
 *   hours: 5,
 *   minutes: 9,
 *   seconds: 30
 * })
 * //=> Mon Sep 1 2014 10:19:50
 */
export function sub(date, duration, options) {
  const {
    years = 0,
    months = 0,
    weeks = 0,
    days = 0,
    hours = 0,
    minutes = 0,
    seconds = 0,
  } = duration;

  const withoutMonths = subMonths(date, months + years * 12, options);
  const withoutDays = subDays(withoutMonths, days + weeks * 7, options);

  const minutesToSub = minutes + hours * 60;
  const secondsToSub = seconds + minutesToSub * 60;
  const msToSub = secondsToSub * 1000;

  return constructFrom(options?.in || date, +withoutDays - msToSub);
}

// Fallback for modularized imports:
export default sub;