bc518174
 王天杨
提交两个项目文件
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import { getDay } from "./getDay.mjs";
import { subDays } from "./subDays.mjs";
/**
* @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.
*
* @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).
*
* @param date - The date to check
* @param day - The day of the week
*
* @returns The date is the previous day of week
*
* @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 function previousDay(date, day) {
let delta = getDay(date) - day;
if (delta <= 0) delta += 7;
return subDays(date, delta);
}
// Fallback for modularized imports:
export default previousDay;
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