Starting the week on Monday with isoWeekday()
Solution 1:
You just need to replace begin.startOf('isoWeek'); with begin.startOf('week');.
Solution 2:
This way you can set the initial day of the week.
moment.locale('en', {
week: {
dow: 6
}
});
moment.locale('en');
Make sure to use it with moment().weekday(1); instead of moment.isoWeekday(1)