Mann said the swearing-in ceremony will be held at 12:30 pm on March 16 at Khatkar Kalan, the ancestral village of legendary freedom fighter Bhagat Singh, in Nawanshahr district.
The BJP is jointly contesting the Punjab Assembly election with former Chief Minister Amarinder Singh's Punjab Lok Congress and Sukhdev Singh Dhindsa's Shiromani Akali Dal (Sanyukt).
Mann is the party's state unit chief.
In a statement, the Commission said polls would now be held on February 20. It coincides with the third phase of polling in Uttar Pradesh.
About generating resources for this poll promise, the AAP national convener said money is not an issue for any government. "The AAP government, if elected to power in Punjab, would manage funds by snubbing all mafias, he said.