Uncertain, but probably the early 12th Century BCE.
The Trojan War is legendary. We don't know the year, much less the day. Legend places it in the 12th Century BCE. That is the extent of our knowledge.
Helen did not start the Trojan war pelccaria did
I think you are referring to Helen of Sparta/Troy. However, she wasn't the prize of the war, she is what started it.
Helen
The 'Trojan War' was said to have started.
None. the Trojan war started because Paris kidnapped Helen, and the Spartans wanted her back
No he was not. He was dead by the time the Trojan War started. It s mentioned in a passage that he appears as a specter to Filoctetes.
Athena, in part, started the Trojan War. The war originated from a quarrel between the goddesses, Aphrodite, Hera, and Athena.
Exact year(s) is unknown, but it was after Paris judged the three goddesses and before the Trojan War started.
. . . the abduction of Helen .
Achaeans.
It was a 10-year war.