The ban covers the next three weekends which rules him out of Glasgow’s Pro14 clash with Zebre on Saturday and Scotland’s Six Nations matches against Ireland on March 14 (or Glasgow’s game with Ospreys that weekend) and Italy on March 20.
The Guinness Pro14 had initially indicated Hastings’ ban would not include the Ireland match before issuing a correction.
Hastings was sent off by referee Frank Murphy after his boot caught the face of Leinster player Cian Kelleher during the first half at the RDS. The Glasgow player was toppling backwards trying to catch the ball when he raised his foot.
In a statement, the Guinness Pro14 said: “The incident was found to merit a mid-range entry point, which indicates a six-week suspension for this offence.
“The Judicial Officer determined that there were mitigating factors, including the player’s acceptance of the foul play, immediate and genuine remorse, cooperation with the disciplinary proceedings and clear disciplinary record, which under the disciplinary rules warranted a reduction in the sanction of 50 per cent.
“The player is suspended from participating in the next three meaningful matches.”