1234567891011121314151617181920212223242526272829303132 |
- import requiredArgs from "../_lib/requiredArgs/index.js";
- import getDay from "../getDay/index.js";
- import subDays from "../subDays/index.js";
- /**
- * @name previousDay
- * @category Weekday Helpers
- * @summary When is the previous day of the week?
- *
- * @description
- * When is the previous day of the week? 0-6 the day of the week, 0 represents Sunday.
- *
- * @param {Date | number} date - the date to check
- * @param {number} day - day of the week
- * @returns {Date} - the date is the previous day of week
- * @throws {TypeError} - 2 arguments required
- *
- * @example
- * // When is the previous Monday before Mar, 20, 2020?
- * const result = previousDay(new Date(2020, 2, 20), 1)
- * //=> Mon Mar 16 2020 00:00:00
- *
- * @example
- * // When is the previous Tuesday before Mar, 21, 2020?
- * const result = previousDay(new Date(2020, 2, 21), 2)
- * //=> Tue Mar 17 2020 00:00:00
- */
- export default function previousDay(date, day) {
- requiredArgs(2, arguments);
- var delta = getDay(date) - day;
- if (delta <= 0) delta += 7;
- return subDays(date, delta);
- }
|