Mark was declared a saint long before their was an official process in place for canonization. He would have been declared a saint by popular acclamation with the final approval usually being made by a bishop.
St. Mark was proclaimed a saint by popular acclaim over 1000 years before the formal canonization process was instituted.
The exact date of the canonization of St. Mark - The Evangelist, the Gospel writer is not know.
But there is a lot of other information available like:
Born: 1st century AD, Libya, according to one tradition, or perhaps Palestine
Died: April 25, 68 AD Alexandria
Feast Day: April 25
Saint Mark was never formally canonised, as he was recognised as a saint from the very earliest days of the Christian community.
Saint Paul was neither beatified not canonized. He was declared a saint long before the canonization process was introduced.
Saint Dominic Savio was beatified on March 5, 1950.
Which Saint Augustine? There are several.
Saint Anselm of Canterbury (d. 1109) was not beatified but was canonized in 1492 by Pope Alexander IV.
Stephen was not beatified. He was declared a saint long before the canonization process was instituted in the 12th century.
Cecilia was neither beatified nor canonized. She was proclaimed a saint by early Christians based on her martyrdom.
St. Christopher was neither beatified nor canonized.
Mother Teresa has been beatified but not yet declared a saint.
He was beatified on October 19, 1975, by Pope Paul VI.
Margaret Ball is not a saint. She has been beatified, however.
Saint Rita was beatified by Pope Leo XIII in 1900.
Monica was neither beatified nor canonized. She was declared a saint by the early Christian community long before the official canonization process was in place.