When Can I Apply for ILR - Confused November or December

[sumeetilr]

Hello Everyone,

I got my Tier 1 General Visa approved on the 15/12/2008 till 15/12/2011.

Came to the UK on 30/12/2008.

Extended my Visa and was approved from 27/01/2012 - 27/01/2014.

When can i apply for ILR? can it be after 15/11/2013 or 15/12/2013?

Will appreciate if i can get better understanding on this so i can start preparing for my application accordingly.

Thanks

[Amber]

From 28 days before 15/12/2013