What date did giant pandas become endangered?

Giant pandas were removed from the endangered list in 2016 and are now classified as vulnerable.

There is no specific date but years. I found this in another question.

The US Fish and Wildlife Service added the Giant Panda to their Endangered List in 1984. The IUCN (The World Conservation Union) had Panda's on their Red List in both 1986 and 1988 but classed as "Rare" and not "Endangered". The ICUN changed the Pandas classification to "Endangered" in 1990.