Adding week selection / month day selection

[Vano]

Hi,

I'd like to add a 'custom' feature to the datepicker. I'd like to be able to select a week / specific days for  a month (eg: all mondays of september).

I'd like to share my current idea on how to implement this because I'm afraid of wanting to reinvent the wheel, so I prefer to request opinions, thoughts before starting to deep into...

So I'm planning to create a new popup that will act as a wrapper of the datepicker in which I'll add a row number for each week number and the same principle applied to the columns, to select the days of the month. 

Does anyone know if there are standard ways to handle this??

I'm not a front/JS specialist... 

Many thanks for your experience returns.

Kr,

Sébastien