function linkFrenchDefaultNWDaysCalendar(app, account) {
    let nonworkingdaysCalendar = new app.db.models.AccountNWDaysCalendar();
    nonworkingdaysCalendar.account = account._id;
    nonworkingdaysCalendar.calendar = '5740adf51cf1a569643cc100'; // france metropolis
    nonworkingdaysCalendar.from = new Date(2000,0,1,0,0,0,0);