It depends on how you read the question. There are three possible dates:
2 September 1945 -- This is when the Viet Minh (the forerunners of the Vietnamese government) declared independence from France. However, the Vietnamese people were still under French control. (You can compare this to 4 July 1776 for the United States in that the Americans were still under British occupation when the Declaration of Independence was issued.)
1 August 1954 -- This is the date when the French surrendered at the end of the First Indochina War and allowed North Vietnam to become an independent country. However, South Vietnam came under strong US sponsorship and quasi-occupation. Vietnamese today (and North Vietnamese at the time) characterize the South Vietnamese government as a US colonial government. Americans argue that it was simply a close relationship, like the US currently enjoys with Israel or South Korea. Regardless while this was the first establishment of Vietnamese sovereignty since the establishment
2 July 1976 -- This was the date when South Vietnam was reunified with North Vietnam and is the date when all of Vietnam (ruled by the former North Vietnamese government) expelled foreign influences.
It was first mapped and included in an empire in 1069-1767 until it was then taken by French rule. Vietnam became independent on September 2, 1945.
Vietnam became independent from its colonist in Sept. 2, 1945.
China - 938
France - 1945
Kuwait became an independent from its colonists in 1961.
Algeria became independent from its colonists in 1962.
Zambia became independent from its colonists in 1964.
Barbados became independent from its colonists in 1962.
Swaziland became independent from its colonists in 1968.
Tonga became independent from its colonists in 1962.
Bangladesh became independent from its colonists in 1955.
Sierra Leone become independent from its colonists on April 27, 1961.
Burundi became independent from its colonists in July 1962.
Lesotho became independent from its colonists in October 1966.
Equatorial became independent from its colonists in October 1968.
Burma became independent from its colonists in February 4, 1948.