As noted above, Mehrgān is a name-day feast. These name-day feasts are festivals celebrated on the day of the year when the day-name and month-name dedicated to a particular angel or virtue intersect. Indeed, Zoroastrian Persians before Islam had 30-days months, which means that each day in a month had a different name, with 12 of the days also being names of the 12 months. The day whose name corresponded to the name of the month was celebrated. It was a celebration of life, seasons changing, God, and joy. In Zoroastrianism, happiness is very important and is considered as a holy virtue that must be attracted. Thus, this religion has always had many feasts and celebrations.