As you want to get the details of deadlines for the M.Tech entrance exam application forms so here is the information of the same for you:

I want to tell you that it is not possible for me to give the deadlines of every entrance exam of M.Tech so please do mention the name of the entrance exam

Here for your reference I am giving you the list of M.Tech entrance exams in India:

B.S.A.U.E.E.E. or B.S. Abdur Rahman University Engineering Entrance Examination
G.A.T.E
M. Tech Entrance Examination of Nirma University in Ahmedabad
P.G.E.C.E.T. or Post Graduate Engineering Common Entrance Test
M. Tech Entrance Examination of Jamia Milia Islamia University in New Delhi
M. Tech Entrance Examination of Indian School of Mines in Dhanbad
All India Engineering Entrance Examination
G.G.S.I.P.U. Engineering C.E.T. Entrance Examination
M. Tech Entrance Examination of R.I.S.T. or Regional Institute of Science and Technology in Meghalaya
M. Tech Entrance Examination of Deenbandhu Chhotu Ram University of Science and Technology
B.E.E.E. or Bharath University Engineering Entrance Exam
U.P.E.S. - S.E.A.T. Engineering Entrance Test of University of Petroleum and Energy studies in Dehradun
M. Tech Entrance Examination of Banaras Hindu University
V.I.T.E.E.E.
Entrance Examination of Manipal Institute of Technology in Karnataka
Entrance Examination of Kalinga Institute of Industrial Technology
B.I.T. or Mesra, Ranchi
T.A.N.C.E.T. or Tamil Nadu Common Entrance Test
Entrance Examination of Dhirubhai Ambani Institute of Information and Communication Technology
Entrance Examination of N.E.R.I.S.T. or North Eastern Regional Institute of Science and Technology
Engineering Entrance Examination of Avinashilingam Deemed University for Women in Coimbatore
M. Tech Entrance Examination of L.N.M. Institute of Information Technology in Jaipur
B.I.T.S.A.T. or Birla Institute of Science and Technology
V.T.U.E.E.E. or V.E.L. Technical University Engineering Entrance Examination in Chennai
M. Tech Entrance Examination of Kerala University
M. Tech Entrance Examination of I.I.I.T. or Indian Institute of Information Technology in Allahabad
M. Tech Entrance Examination of International Institute of Information Technology or I. I. I. T.
D.A.IICT Entrance Examination
Master of Engineering Entrance Examination of National Institute of Technical Teachers Training and Research in Chandigarh
P.G.C.E.T. or Post Graduate Common Entrance Test in Karnataka
Entrance Examination of Motilal Nehru National Institute of Technology in Allahabad
P.T.U.CET
S.R.M.E.E.E. or S.R.M. Engineering Entrance Examination
Karnataka C.E.T.

Here for your reference I am giving you the GATE deadlines of 2014:

GATE 2014 Online Enrolment: from September 2 to 1 2013
Last Date for GATE 2014 Online Application Submission: October 3, 2013
Receipt of Printout of GATE 2014 Online Application Form at Zonal Centre: By October 17, 2013 (extended date from October 10, 2013)
Request for Change in the GATE 2014 Exam Centre: From November 15 to 25, 2013
Download of GATE 2014 Admit Card: December 18, 2013
GATE 2014 Examination: On February 2 , 15 & 16 , March 1 & 2, 2014
Timings: Forenoon: 9.00 AM to 12.00 Noon, Afternoon: 2.00 PM to 5.00 PM
GATE 2014 Result Announcement: March 28, 2014 at 10 am