Avail 10(13a) and 80gg simultaneously

Dear All,

I had a query regarding claiming the exemption of allowances u/s 10(13A) and Sec. 80GG simulatneously. What will the implications if suppose, within the same financial year in foll. 2 scenarios:

1. I have received HRA for 6 months from my previously employer and after leaving him, I received no HRA in my second employment (Proportional 80GG for later employer?)

2. If in the first scenario, no employment in the later 6 months after leacing st employer.

Considering, other basic conditions of 80GG and 10(13A) are fulfilled.