The Mandaean calendar is a 365-day solar calendar used by the Mandaean people. It consists of twelve 30-day months, with five extra days at the end of à  umbulta (the 8th month). The Parwanaya (or Panja) festival takes place during those five days. Since there is no leap year, every four years, all Mandaean dates (like beginnings of the months or festivals) move one day back with respect to the Gregorian calendar.
Each month (iahra or yahra) is named after a constellation (manzalta). The Mandaic names of the twelve constellations of the Zodiac are derived from common Aramaic roots. As with the seven planets, the constellations, frequently known as the trisar (, "The Twelve") or trisar malwaà ¡ia ("Twelve Constellations") in Mandaic texts, are generally not viewed favorably since they constitute part of the entourage of Ruha, the Queen of the World of Darkness, who is also their mother.
There is also another alternative set of names for the Mandaean months cognate with the month names found in the Babylonian and Hebrew calendars.
Each month consists of exactly 30 days. The Parwanaya festival comes between the 8th month (Ã Â umbulta) and 9th month (Qaina) to make up for 5 extra days in the solar calendar.
Due to a lack of a leap year included in the Mandaean calendar, dates change by one day every four years with respect to the Gregorian calendar. Currently, for example in 2022 CE, Sará¹Âana, meaning Cancer, corresponds to December / January in the Gregorian calendar, instead of June / July.
The hours of the day are counted starting at dawn (á¹£ipra), although Mandaeans formerly counted the hours of the day starting at sunset or evening (paina). In Mandaic, a 24-hour day is known as a yuma, daytime as ÿumama, and nighttime as lilia. An hour is called a à ¡aia, 5 minutes is called a à ¡uà ¡a, and a minute is called a pigia.
Some days are considered to be auspicious, while others are ominous (mbaá¹Âá¹Âal).
The days of the week are as follows. Habà ¡aba (Sunday) is considered to be the first day of the week.
The four seasons are as follows, with the year starting with winter. The three months of each season, given below, are also referred to in Mandaic as the beginning, middle, or end of the season.
A Mandaean year is called a à ¡idta.
The Mandaean calendar is calculated from the year that Adam was born, or approximately 443,370 BCE. Charles G. Häberl calculates the date 18 July 2019 CE as corresponding to 1 Dowla 481,343 AA (AA = after the creation of Adam). The latter half of 2024 would correspond to 481,348 AA.
All Mandaean years consist of exactly 365 days (12 regular months of 30 days each, plus the 5 intercalary days of the Parwanaya). Since Mandaean months do not have leap years accounted for every four years, seasons "slip back" and will not correspond to the same Gregorian months over time.
A chronology of the world according to of the Right Ginza is as follows.
According to of the Right Ginza, there are four epochs (or eras; ) of the world, which is given a duration of 480,000 years.
Mandaean festivals are:
Below is an example of a calendar year for the Mandaean year 445375, which corresponds to the Gregorian calendar years 2005âÂÂ2006 or Jewish calendar year 5766 (Gelbert 2005: 274). Fasting () is practiced on some days.
Below are some Mandaean holiday dates for 2024:
Every four years, the dates are shifted back by one day, since the Mandaean calendar lacks a leap day. As a result, Mandaean holiday dates for 2028 are:
Dakhil Shooshtary, an Iranian-American Mandaean, was known for making Mandaean calendars.