As an AI language model, I cannot predict with certainty what Julius Caesar would have said on a specific day, but I can provide some historical context and speculate based on his personality and behavior.
Assuming you are referring to March 15th, historically known as the Ides of March, this was the day in 44 BC when Julius Caesar was assassinated in Rome by a group of senators led by Marcus Brutus and Gaius Cassius Longinus.
In William Shakespeare's play "Julius Caesar," Caesar is famously warned by a soothsayer to "beware the Ides of March."
Caesar responds with the famous line:
"He is a dreamer; let us leave him. Pass."
If Caesar were alive today, he may have reflected on the dangers of political power and the consequences of underestimating one's enemies.
He may have also expressed regret over not heeding the warning of the soothsayer and taking greater precautions to protect himself.
Ultimately, it's impossible to know for certain what Julius Caesar would say on this day, but it's likely that he would have had something to say about the events of his own assassination and the political turmoil that followed in its wake.