Part time diploma colleges are

K. J. Somaiya Polytechnic

Shri Bhagubhai Mafatlal Polytechnic

M.H Saboo Siddik Polytechnic

K C College of Management Studies

You can visit here for more information
https://engineering.careers360.com/colleges/list-of-diploma-engineering-colleges-in-thane

https://engineering.careers360.com/colleges/list-of-diploma-engineering-colleges-in-mumbai

Thank you hope this answer helps you.