Is recurrence rule format same for all major calendar scheduler service

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C#

ASP.NET

WebForms

Ajax

jQuery

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I am developing my own Calendar scheduler app in ASP.net web forms using C# and SQL Server 2012.

I just read an article on Github repository about how we should always use RRule for such apps.

I am curious to know if the RRules formats in iCal, Google Calendar & Outlook and any other major service provider of such apps are the same. In short is RRule a standard way of creating such apps.

Please, anyone, guide me as to how should I go forward with this app development.
I intend to use Jquery ajax to fetch/list/display events from database to the custom calendar that I designed which looks like this see link Cal App Screenshot

What I have tried:

I planned to store each recurrence as a row in the database, Which I guess is a recipe for disaster. I want to use vertical & horizontal spanning divs to display events on the calendar. Inline edit the events on the calendar.