react-day-picker
Version:
Customizable Date Picker for React
27 lines (24 loc) • 900 B
text/typescript
import type { DateLib } from "../classes/index.js";
/**
* Returns the start date of the week in the broadcast calendar.
*
* The broadcast week starts on Monday. If the first day of the month is not a
* Monday, this function calculates the previous Monday as the start of the
* broadcast week.
*
* @since 9.4.0
* @param date The date for which to calculate the start of the broadcast week.
* @param dateLib The date library to use for date manipulation.
* @returns The start date of the broadcast week.
*/
export function startOfBroadcastWeek(date: Date, dateLib: DateLib): Date {
const firstOfMonth = dateLib.startOfMonth(date);
const dayOfWeek = firstOfMonth.getDay();
if (dayOfWeek === 1) {
return firstOfMonth;
} else if (dayOfWeek === 0) {
return dateLib.addDays(firstOfMonth, -1 * 6);
} else {
return dateLib.addDays(firstOfMonth, -1 * (dayOfWeek - 1));
}
}