Pakistan became a nuclear power in which year?

Pakistan became atomic power on 28th May 1998.
The date of 28th May is also known as “Yom E Takbir”.
Pakistan conducted this nuclear test in Rash Koh Hills in Chaghi, Balochistan and detonated five Nuclear devices at 03:15pm on 28th May 1998.
This operation was named Chaghi-I.