The constitution-making body of Nepal endorsed the constitution bill with an overwhelming two-thirds majority on Wednesday night.
Chairman of the Constituent Assembly Subhas Nembang made a final announcement in this regard after 507 out of total 601 lawmakers voted on the new constitution bill.
The new constitution, consisting of 308 articles and nine annexes, has secured a secularism and federal democratic republic.
Nepali President Dr Ram Baran Yadav is scheduled to unveil the post-war national charter at 5 p.m. on September 20 in Kathmandu.
This is the first full-fledged constitution in the Himalayan nation. Earlier, the country got an interim constitution in 2007 following the people's movement in 2006 that toppled the 240-year monarchy.