Every 3 and 6 Months Recurrence on later.js stating from a particular date

[aravind2base]

I am trying to create recurrence every 3 and 6 months using the later.js(https://github.com/bunkat/later).

This is my code

// My value.scheduled_date is 2018-09-06
var d = new Date(value.scheduled_date);
var day = d.getDate();
// month count will be -1 as it starts from 0
var month = d.getMonth();
var year = d.getFullYear();

var recurSched = later.parse.recur().on(day).dayOfMonth().every(3).month();
var schedules = later.schedule(recurSched).next(5);
console.log(schedules)

This gives 3 months recurrence starting from the current month, but I want the recurrence to start from the scheduled_date. When I add starting On to the code

var recurSched = later.parse.recur().on(day).dayOfMonth().every(3).month().startingOn(month + 1);
var schedules = later.schedule(recurSched).next(5);
console.log(schedules)

Recurrence is staring only after that month for every year. I want recurrence to start from a particular date so that the recurrence of other years won't be affected.

The same is the case with my 6 months code

var recurSched = later.parse.recur().on(day).dayOfMonth().every(6).month().startingOn(month+1);
var schedules = later.schedule(recurSched).next(5);
console.log(schedules);