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react-day-picker

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Customizable Date Picker for React

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import { toGregorianDate, toHebrewDate } from "../utils/dateConversion.js"; import { clampHebrewDay, monthIndexToHebrewDate, monthsSinceEpoch, } from "../utils/serial.js"; export function addMonths(date, amount) { if (amount === 0) { return new Date(date.getTime()); } const hebrew = toHebrewDate(date); const targetIndex = monthsSinceEpoch(hebrew) + amount; const target = monthIndexToHebrewDate(targetIndex, hebrew.day); const day = clampHebrewDay(target.year, target.monthIndex, target.day); return toGregorianDate({ ...target, day }); }