Jake Long was sentenced Tuesday in Newfoundland Supreme Court in St. John's.
Justice James Adams gave Long 1.5 credit for the time he had already spent in custody, leaving 22 months on his term.
Crown prosecutor Sheldon Steeves had asked for a three- to four-year prison term.
"(The victim) is lucky he wasn't killed, having been stabbed three times with a knife," Steeves said during the sentencing hearing last month.
Steeves said Long should get straight-time credit for the time he's already served in custody.
Defence lawyer Jeff Brace said a sentence of two years, with 1.5 times credit, was more appropriate.
He had pointed to Long's young age, the fact he is a first-time offender and the significant progress he has made to overcome his addiction problems.
Long, 19, pleaded guilty earlier this year to aggravated assault, concealing a weapon, damaging RNC property and breaching a recognizance.
Long was charged as a result of an incident March 23, 2014, when Long stabbed a 36-year-old man on the popular downtown street.
At 2:45 a.m., Long and the man got into an argument outside Sal's Pizza on George Street. While the man was heading to get a taxi while eating his pizza, Long confronted him from behind. Long pulled out a pocket knife and stabbed the man three times.
The first stab wound penetrated the man's right shoulder, fracturing his right scapula, which required emergency surgery. The second wounded his right side, requiring six to seven staples to close the gash. The third stab wound to his chest caused a small pneumothorax, or puncture, to his lung.
When Long was taken into custody, he became irate and damaged property at RNC headquarters. He damaged a video camera and kicked a hole in a wall. The total cost of the damage was $500.
Long had been released on bail following a bail hearing in April 2014, but was taken back to jail Jan. 7, 2015, for breaching bail conditions by consuming alcohol.