Click the button bellow to continue with your google account.
After adding it to your calendar through the website here or Google's Marketplace here, you should see a "Sun" logo on the right side of your Google Calendar.
There, you can convert your calendars to be treated with Shamsi events. I recommend having at least one additional calendar for your Shamsi events.
I have to indicate that the purpose of this add-on is to fix the problem with repeating events based on the Shamsi calendar. Notice that you should already activate Alternate Calendars. Set it to Persian :)
Here is an example:
We look forward to hearing from you