react-native-plain-calendar/build/src/utils/isDisabledDate.js

Calendar component for React-Native

import * as dateFns from 'date-fns';
export function isDisabledDate(day, monthStart, minDate, maxDate) {
    return (!dateFns.isSameMonth(day, monthStart) ||
        dateFns.isBefore(day, dateFns.subDays(minDate, 1)) ||
        dateFns.isAfter(day, maxDate));
}