react-date-picker/src/shared/dates.ts

A date picker for your React app.

import {
  getDayEnd,
  getDayStart,
  getDecadeEnd,
  getDecadeStart,
  getMonthEnd,
  getMonthStart,
  getYearEnd,
  getYearStart,
} from '@wojtekmaj/date-utils';

import type { RangeType } from './types.js';

/**
 * Returns the beginning of a given range.
 *
 * @param {RangeType} rangeType Range type (e.g. 'day')
 * @param {Date} date Date.
 * @returns {Date} Beginning of the range.
 */
export function getBegin(rangeType: RangeType, date: Date): Date {
  switch (rangeType) {
    case 'decade':
      return getDecadeStart(date);
    case 'year':
      return getYearStart(date);
    case 'month':
      return getMonthStart(date);
    case 'day':
      return getDayStart(date);
    default:
      throw new Error(`Invalid rangeType: ${rangeType}`);
  }
}

/**
 * Returns the end of a given range.
 *
 * @param {RangeType} rangeType Range type (e.g. 'day')
 * @param {Date} date Date.
 * @returns {Date} End of the range.
 */
export function getEnd(rangeType: RangeType, date: Date): Date {
  switch (rangeType) {
    case 'decade':
      return getDecadeEnd(date);
    case 'year':
      return getYearEnd(date);
    case 'month':
      return getMonthEnd(date);
    case 'day':
      return getDayEnd(date);
    default:
      throw new Error(`Invalid rangeType: ${rangeType}`);
  }
}