There were tsunamis long before recorded history began, so it's impossible to answer the question.
World Cricket Tsunami Appeal happened in 2004.
well it depends on what tsunami you mean, there is more than one...
2011 In Japan 8.9 earth quake caused the tsunami
last year
at kata beach dec 26th 2004 by 10-15 am
World Tsunami Awareness Day is observed on November 5th every year to raise awareness about the dangers of tsunamis and promote actions to mitigate their impact. It was designated by the United Nations General Assembly in December 2015.
The effect we now call tsunami has been happening since there have been oceans on the planet Earth (billions of years). There was no "First Tsunami"; the Japanese have been calling the effect 'tsunami' for many centuries.
2004
2002
The most recent Tsunami to hit Japan was in March of 2011.
It could be billions of years old. There would have to be moving plates, and also oceans.
2004