Ancient Zoroastrians observed a 360-days Calendar of 12 months with each month comprising of 30 days. The months were named after seasonal festivals but the days of each month were merely numbered from one to thirty. In the middle of the fifth century BCE, during the Achaemenian era, a distinctive 360-days calendar was created. Each day (Roj) of the twelve months was assigned.......... In the Shenshai calendar, a year consists of 12 months or Mah's, and each month has 30 days. Each of these days is known as a Roj, and each roj has a distinct name. However, the 12th month is followed by five additional Gatha or Gah days. A major revival of the Zoroastrian religion took place in 226 CE when the Sassanian King Ardashir I came to the Persian throne. He changed the old 360-days calendar to 365 days by adding five extra days, which were piously dedicated to the five Gathas of Zarathushtra. The Zoroastrian calendar uses the Yz suffix (Yazdegerdi Era) for its calendar era (year numbering system), indicating the number of years since the coronation in 632 CE of Yezdegerd III, the last monarch of the Sassanian dynasty............ The Zoroastrians in India intercalated an extra month to the calendar around 1129 CE, Meanwhile, the Zoroastrians who remained in Iran never once intercalated a thirteenth month. Around 1720 CE, an Irani-Zoroastrian priest named Jamasp Peshotan Velati traveled from Iran to India. Upon his arrival, he discovered that there was a difference of a month between the Parsi calendar and his own calendar. Around 1740 CE, some influential priests argued that since their visitor had been from the ancient 'homeland', his version of the calendar must be correct, and their own must be wrong............. Under the Fasli calendar, Year-1 is believed to have begun at the vernal equinox on 21-Mar-632 C.E., being the time and day of coronation of Yazdegerd III, the last monarch of the Sassanian dynasty. Due to its conformity with the vernal equinox, this calendar had two salient points. It was in harmony with the seasons and New Year's Day coincided with vernal equinox. Similar to Shenshai and Kadmi calendars, it followed the model (12 months of 30 days each plus 5 extra days), but also had an auto-regulatory leap day every four years - the leap day, called Avardad-Sal-Gah (Pahlavi: Ruz-e-vahizak), followed the five existing Gah days at the end of the year............. In this oeuvre, the author has presented the Gregorian dates for all days (Roj's) and months (Mah's) for each month of 118 Yazdegerdi years from 1384 Yz (2014 CE) through 1500 Yz (2132 CE). More importantly, the presentation is such that this information is available on the same page under all three systems, viz. Kadmi, Shenshai & Fasli, currently in use for Zoroastrian Calendars. Moreover, the author has included information pertaining to formation of the three systems of Zoroastrian calendars as well as evolution of names of Roj's and Mah's from the Pre-Gathic to Post-Pahalvi Eras. A schedule of Zoroastrian Festivals has been included, too.
About the Author: The author is a civil engineer settled with his wife in Bangalore for the past 38 years. After retiring from an active profession that saw him carry out construction project management in metropolitan cities in India, he now devotes his time to study the history and theology of Mazdayasni Zoroastrian Religion, which is the religion of his birth. The author is amazed by the simplicity and depth of the core beliefs of this religion and is not surprised that it survives to this day after being virtually annihilated by the invading hordes comprising of Greeks, Romans and Arabs at various times during the history of Iran.