react-native-full-calendars/lib/module/calendar/utils/date.js

React Native Full Calendar (RNFC) is an intuitive and powerful calendar component library designed for React Native.

"use strict";

import { addDays, differenceInCalendarDays, differenceInWeeks, endOfMonth, endOfWeek, format, isAfter, isSameDay, isWithinInterval, startOfMonth, startOfWeek } from 'date-fns';
export const getWeeksInMonth = date => {
  const startWeek = startOfWeek(startOfMonth(date));
  const endWeek = endOfWeek(endOfMonth(date));
  const weeksInMonth = differenceInWeeks(endWeek, startWeek) + 1;
  return weeksInMonth;
};
export const isLastWeekOfMonth = date => {
  const lastDayOfMonth = endOfMonth(date);
  const startOfLastWeek = startOfWeek(lastDayOfMonth);
  return isSameDay(date, startOfLastWeek) || isAfter(date, startOfLastWeek);
};
export const isSameStartOfWeek = (date, {
  weekStartDay
}) => {
  const startOfTheWeek = startOfWeek(date, {
    weekStartsOn: weekStartDay
  });
  return isSameDay(date, startOfTheWeek);
};
export const isSameStartOfMonth = date => {
  const startOfTheMonth = startOfMonth(date);
  return isSameDay(date, startOfTheMonth);
};
export const getIterableDateBetweenDates = (startDate, endDate) => {
  const dates = [];
  let currDate = startDate;
  while (isWithinInterval(currDate, {
    start: startDate,
    end: endDate
  })) {
    dates.push(format(currDate, 'yyyy-MM-dd'));
    currDate = addDays(currDate, 1);
  }
  return dates;
};
export const getDaysRemaining = date => {
  if (isLastWeekOfMonth(date)) {
    return differenceInCalendarDays(endOfMonth(date), date) + 1;
  }
  return differenceInCalendarDays(endOfWeek(date), date) + 1;
};
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