react-day-picker
Version:
Customizable Date Picker for React
17 lines • 865 B
JavaScript
/** Return the start month based on the props passed to DayPicker. */
export function getInitialMonth(props, dateLib) {
const { month, defaultMonth, today = new dateLib.Date(), numberOfMonths = 1, endMonth, startMonth } = props;
let initialMonth = month || defaultMonth || today;
const { differenceInCalendarMonths, addMonths, startOfMonth } = dateLib;
// Fix the initialMonth if is after the to-date
if (endMonth && differenceInCalendarMonths(endMonth, initialMonth) < 0) {
const offset = -1 * (numberOfMonths - 1);
initialMonth = addMonths(endMonth, offset);
}
// Fix the initialMonth if is before the from-date
if (startMonth && differenceInCalendarMonths(initialMonth, startMonth) < 0) {
initialMonth = startMonth;
}
return startOfMonth(initialMonth);
}
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