According to Leadership, Brown, who made the revelation in a statement also called on the world to show support for the abducted girls.
"We, of course, hope that the Chibok girls will be released before July 22," Brown said.
Brown, who is expected to commence his new term as special envoy this month, promised that he will never abandon the girls.
"We are reminding people that we are in the mind-set of a global civil rights struggle," he said. "Girls' rights should be taken seriously and they should have the right to be at school free of intimidation and violence. We will mark the 100 days by pledging to rebuild their Chibok school and by calling for international support for safe school across Nigeria."
The UN special envoy also hinted that, vigils would be staged on behalf of the captives at the same time in Africa, Asia, Latin America, Europe and the United States under the banner #BringBackOurGirls.
According to the statement, Brown is calling on civil society and youth organisations to come together in solidarity with the Chibok girls by sending letters of support, demanding the safe return of the girls. He said that all messages of solidarity will be channeled to Chibok community leaders and families of the girls through an online platform http://www.aworldatschool.org/page/s/100daysBBOG.
The statement further disclosed that Brown will also send the petition to President Goodluck Johnathan and UN Secretary Ban Ki-moon, and that the girls' families are required to sign the petition and offer their full support for the Safe Schools Initative, which is a fund set up to pilot 500 safe schools in northern Nigeria.
He explained that the programme is expected to bring the federal government and Nigerian business leaders together with the international community in order to make sure that all children are secure when learning.
Meanwhile, Gordon Brown, had on July 3, 2014, criticized the United Kingdom, UK, for not doing enough to help the Nigerian government on the school girls abducted in Borno State
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