When was Ulhasnagar city formed?

After the partition of India, over 100,000 Sindhi-speaking refugees from the newly-created West Pakistan were relocated to deserted military camps five kilometers from Kalyan. The area was converted into a township in 1949, and named Ulhasnagar by the then Governor-general of India, C. Rajagopalachari (literally 'city of joy'; ulhas=joy; nagar=city). On August 8, 1949 the first and last Governor-General of India, C. Rajagopalachari, laid the foundation stone.

Ref : http://en.wikipedia.org/wiki/Ulhasnagar