What is the ruling on a person swearing by Allah upon the Qur'an regarding something they forgot doing, or were coerced into doing under threat?

"The discussion advanced regarding the ruling on one who swore an oath believing it to be true, only to discover that the matter was not as he swore, as well as regarding one who swore a false oath to ward off harm from himself. The website is located in the State of Qatar under the supervision of the Ministry of Endowments and Islamic Affairs of Qatar."