react big calendar start week from monday instead of sunday?

I also wanted to change react-big-calendar first day of week to Monday.
Thank you for your question, because it helped me to find a way of changing it.
Try the following code snippet is from my project:

moment.locale('ko', {
    week: {
        dow: 1,
        doy: 1,
    },
});

BigCalendar.momentLocalizer(moment);

So the full extract looks something like:

import moment from 'moment';
import BigCalendar from 'react-big-calendar';

moment.locale('ko', {
    week: {
        dow: 1,
        doy: 1,
    },
});
BigCalendar.momentLocalizer(moment);

const Main = (props) => <BigCalendar
    events={props.events}
    startAccessor={'start'}
    endAccessor={'end'}
    titleAccessor={'title'}
    allDayAccessor={'allDay'}
    onNavigate={props.onNavigate}
/>;

Hope that helps.