react-day-picker
Version:
Customizable Date Picker for React
41 lines • 1.7 kB
JavaScript
/** The number of days in a month when having 6 weeks. */
const NrOfDaysWithFixedWeeks = 42;
/** Return all the dates to display in the calendar. */
export function getDates(displayMonths, maxDate, props, dateLib) {
const firstMonth = displayMonths[0];
const lastMonth = displayMonths[displayMonths.length - 1];
const { ISOWeek, fixedWeeks, locale, weekStartsOn } = props ?? {};
const { startOfWeek, endOfWeek, startOfISOWeek, endOfISOWeek, addDays, differenceInCalendarDays, differenceInCalendarMonths, isAfter, endOfMonth, Date } = dateLib;
const startWeekFirstDate = ISOWeek
? startOfISOWeek(firstMonth)
: startOfWeek(firstMonth, {
weekStartsOn,
locale
});
const endWeekLastDate = ISOWeek
? endOfISOWeek(endOfMonth(lastMonth))
: endOfWeek(endOfMonth(lastMonth), {
weekStartsOn,
locale
});
const nOfDays = differenceInCalendarDays(endWeekLastDate, startWeekFirstDate);
const nOfMonths = differenceInCalendarMonths(lastMonth, firstMonth) + 1;
const dates = [];
for (let i = 0; i <= nOfDays; i++) {
const date = addDays(startWeekFirstDate, i);
if (maxDate && isAfter(date, maxDate)) {
break;
}
dates.push(new Date(date));
}
// If fixed weeks is enabled, add the extra dates to the array
const extraDates = NrOfDaysWithFixedWeeks * nOfMonths;
if (fixedWeeks && dates.length < extraDates) {
for (let i = 0; i < 7; i++) {
const date = addDays(dates[dates.length - 1], 1);
dates.push(new Date(date));
}
}
return dates;
}
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