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react-day-picker

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Customizable Date Picker for React

27 lines (24 loc) 900 B
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)); } }