"officially proclaimed" is a correct and usable phrase in written English.
It means something has been declared or announced in an official or formal manner. It can be used in various contexts, such as to describe a new law, to announce a new leader, or to declare a special day. Example: The new tax reform was officially proclaimed by the government last week, causing controversy among citizens.
Mr. Francis T. Purcell, a Nassau County Executive, officially proclaimed the day "Lindbergh Day".
The former French colony of Guinea officially proclaimed itself an independent republic in October , 1958
General de Gaulle was officially proclaimed President of the Republic at a big ceremony at the Palais de l'Elysee.
The Kingdom of Italy was officially proclaimed on March 17 , 1861 by a parliament assembled in Turin.
In 1945 Stalingrad was officially proclaimed a Hero City of the Soviet Union for its defense of the motherland.
As First Dog on the Moon has officially proclaimed, The Lid Is Off, and the fans are enjoying it.
So, we can officially proclaim the N.B.A. and N.H.L. playoffs are off and running.
There may be deep truths in religions, but these may well not be the truths that the religions themselves officially proclaim.
That means that General Odierno will be in charge when the United States reduces its troop level to 50,000 in August and officially proclaims the end to its combat mission in Iraq.
MOSCOW — In recent months, various prominent public figures, including at least one close associate of President Vladimir V. Putin, have insisted that Russia officially proclaim Mikhail S. Gorbachev a criminal for abetting the collapse of the Soviet Union.
While the Bush Administration officially proclaims that America's longtime strong-dollar policy is intact, currency traders, economists and finance ministers worldwide have concluded the opposite, and the dollar has recently hit record lows against both the euro and the yen.
