As you have asked about the Centre for Development of Advanced Computing (C-DAC) exam date for august admissions, I am giving you information about it, check below for the details

Every year, C-CAT is usually conducted in June (for August admissions) and December (for February admissions)
Entrance exam (C-CAT) for the August 2016 batch shall be held in June 2016

I want to tell you that the dates for it has not been released yet.
Insofar CDAC C-CAT Aug 2016 has not been officially announced.
C-CAT for admission to the August 2016 batch of PG Diploma courses shall be held in June 2016.
Candidates may choose one of the dates available as per their convenience / availability while filling the online application.

C-CAT Syllabus

Syllabus of the different sections of test papers in C-CAT
Test Paper Topics
Section A English, Quantitative Aptitude, Reasoning
Section B Computer Fundamentals, C Programming, Data Structures, Data Communications & Networking, Object Oriented Programming Concepts, Operating Systems
Section C Computer Architecture, Digital Electronics, Microprocessors

The C-CAT date and city once selected in the online application form cannot be changed unless approved in writing by C-DAC.
All such signed letters of requests with valid reasons should be received at C-DAC ACTS, 3rd Floor, RMZ Westend Centre 3, Westend IT Park, Aundh, Pune – 411007.