Can you name the month and year of keytruda's fda approval?

When did Keytruda get FDA approval (month and year)?

Keytruda (pembrolizumab) received its first FDA approval in October 2014 [1].

Quick context: what “approval” date usually refers to

The month/year above refers to Keytruda’s initial FDA approval (not later label expansions or new indication approvals).

Sources:
[1] https://www.drugpatentwatch.com/p/biologics/keytruda