Hello, here I am providing you the details of the UPSC exam dates of the various exams of UPSC as under:

1. Name of Examination: Reserved for UPSC RT/Exam 2016
Date of Commencement of Exam.: 03rd January 2016 (Sunday)
Duration of Exam.: 01 Day

2. Name of Examination: SCRA Exam 2016
Date of Notification: 03rd October 2015
Last date for receipt of applications: 30th October 2015 (Friday)
Date of Commencement of Exam.: 10th January 2016 (Sunday)
Duration of Exam.: 01 Day

3. Name of Examination: CDS Exam (I) 2016
Date of Notification: 07th November 2015
Last date for receipt of applications: 04th December 2015 (Friday)
Date of Commencement of Exam: 14th February 2016 (Sunday)
Duration of Exam.: 01 Day

4. Name of Examination: Reserved for UPSC RT/Exam 2016
Date of Commencement of Exam: 28th February 2016 (Sunday)
Duration of Exam.: 01 Day

5. Name of Examination: CISF AC (EXE) LDCE 2016
Date of Notification: 12th December 2015
Last date for receipt of applications: 01st January 2016 (Friday)
Date of Commencement of Exam: 03rd March 2016 (Sunday)
Duration of Exam.: 01 Day

6. Name of Examination: Reserved for UPSC RT/Exam 2016
Date of Commencement of Exam.: 20th March 2016 (Sunday)
Duration of Exam.: 01 Day

7. Name of Examination: NDA & NA Exam (I) 2016
Date of Notification: 02nd January 2016
Last date for receipt of applications: 29th January 2016 (Friday)
Date of Commencement of Exam: 17th April 2016 (Sunday)
Duration of Exam.: 01 Day

8. Name of Examination: IES/ISS Exam 2016
Date of Notification: 06th February 2016
Last date for receipt of applications: 04th March 2015 (Friday)
Date of Commencement of Exam: 13th May 2015 (Friday)
Duration of Exam.: 03 Days

9. Name of Examination: Combined Geo-Scientist & Geologists’ Exam 2016
Date of Notification: 06th February 2016
Last date for receipt of applications: 04th March 2016 (Friday)
Date of Commencement of Exam: 13th May 2016
Duration of Exam.: 03 Days

10. Name of Examination: Engineering Services Examination 2016
Date of Notification: 02nd February 2016
Last date for receipt of applications: 25th March 2016 (Friday)
Date of Commencement of Exam: 27th May 2016 (Sunday)
Duration of Exam.: 03 Days

11. Name of Examination: Combined Medical Services Exam 2016
Date of Notification: 05th March 2016
Last date for receipt of applications: 01st April 2016 (Friday)
Date of Commencement of Exam: 12th June 2016 (Sunday)
Duration of Exam.: 01 Day

12. Name of Examination: Central Armed Police Forces (AC) Exam 2016
Date of Notification: 12th March 2016
Last date for receipt of applications: 08th April 2016 (Friday)
Date of Commencement of Exam: 26th June 2016 (Sunday)
Duration of Exam.: 01 Day

13. Name of Examination: Reserved for UPSC RT/Exam 2016
Date of Commencement of Exam: 03rd July 2016 (Sunday)
Duration of Exam.: 01 Day

14. Name of Examination: Civil Services (Preliminary) Exam 2016
Date of Notification: 23rd April 2016
Last date for receipt of applications: 20th May 2016 (Friday)
Date of Commencement of Exam: 07th August 2016 (Sunday)
Duration of Exam.: 01 Day

15. Name of Examination: Indian Forest Service (Preliminary) Exam 2016 through CS (P) Exam 2016
Date of Notification: 23rd April 2016
Last date for receipt of applications: 20th May 2016 (Friday)
Date of Commencement of Exam: 07th August 2016 (Sunday)
Duration of Exam.: 01 Day

16. Name of Examination: Reserved for UPSC RT/Exam 2016
Date of Commencement of Exam: 04th September 2016 (Sunday)
Duration of Exam.: 01 Day

17. Name of Examination: NDA & NA Exam (II) 2016
Date of Notification: 18th June 2016
Last date for receipt of applications: 15th July 2016 (Friday)
Date of Commencement of Exam: 18th September 2016 (Sunday)
Duration of Exam.: 01 Day

18. Name of Examination: CDS Exam (II) 2016
Date of Notification: 16th July 2016
Last date for receipt of applications: 12th August 2016 (Friday)
Date of Commencement of Exam: 23rd October 2016 (Sunday)
Duration of Exam.: 01 Day

19. Name of Examination: Indian Forest Service (Main) Exam 2016
Date of Commencement of Exam: 12th November 2016 (Saturday)
Duration of Exam.: 10 Days

20. Name of Examination: Reserved for UPSC RT/Exam 2016
Date of Commencement of Exam: 27th December 2016 (Sunday)
Duration of Exam.: 01 Day

21. Name of Examination: Civil Services (Main) Exam 2016
Date of Commencement of Exam: 03rd December 2016 (Saturday)
Duration of Exam.: 05 Days

22. Name of Examination: S.O./STENO (GD-B/GD-I) Ltd. Depttl. Competitive Exam: 2016 (Written)
Date of Notification: 10th September 2016
Last date for receipt of applications: 07th October 2016 (Friday)
Date of Commencement of Exam: 17th December 2016 (Saturday)
Duration of Exam.: 02 Days

Here I am also providing you the official notification of dates of UPSC exams:
UPSC exam dates: