Entitlement of new employee to 13th month pay

Dear PAO,

This year, I recently got my first job as a finance analyst at a company in Quezon City. As the holiday season draws near, one of the topics of discussion among my workmates is the 13th month pay. I wonder if I am already entitled to it even if I only joined the company on Oct. 1, 2023, and what would be the possible amount I would receive if I am entitled.