When was the Armenian alphabet created according to tradition?

According to tradition, the Armenian alphabet was created in 405 CE by the monk and linguist St. Mesrop Mashtots.21

He was supported in this endeavor by St. Isaac the Great, the head of the Armenian Apostolic Church, and a Greek individual named Rufanos. The script was initially developed with 36 characters, later expanded by two, and was instrumental in establishing a golden age of Armenian literature through the translation of the Bible.21