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PersDay.com: Online Persian Calendar and Memo Book Web Application specially designed for Iranians, shows Persian(Hijri-Shamsi), Gregorian, and Hijri-Ghamari calendars for each day; Users can write different types of notes for each day, week, month, season, or year.
The calendar's epoch (first year) corresponds to the Hijrah in 622 CE, which is the same as the epoch of the Lunar Hijri calendar but as it is a solar calendar, the two calendars' year numbers do not coincide with each other and are slowly drifting apart, being about 43 years apart as of 2023.
For Hijri years since 1297 AH (1879/1881 CE), the Gregorian date of 1 Muharram, the first day of the year in the Islamic calendar, is given. The first Hijri year (AH 1) was retrospectively considered to have begun on the Julian calendar date 15 July 622 (known as the ‘astronomical’ or ‘Thursday’ epoch, Julian day 1,948,439) or 16 July ...
Islamic calendar stamp issued at King Khalid International Airport on 10 Rajab 1428 AH (24 July 2007 CE). The Hijri calendar (Arabic: ٱلتَّقْوِيم ٱلْهِجْرِيّ, romanized: al-taqwīm al-hijrī), or Arabic calendar also known in English as the Muslim calendar and Islamic calendar, is a lunar calendar consisting of 12 lunar months in a year of 354 or 355 days.
The Hijri era is calculated according to the Islamic lunar calendar, whose epoch (first year) is the year of Muhammad's Hijrah, and begins on the first day of the month of Muharram (equivalent to the Julian calendar date of July 16, 622 CE). [2] [b] The date of the Hijrah itself did not form the Islamic New Year.
The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.
Microsoft's Kuwaiti algorithm is used in Windows to convert between Gregorian calendar dates and Islamic calendar dates. [1] [2] There is no fixed correspondence defined in advance between the algorithmic Gregorian solar calendar and the Islamic lunar calendar determined by actual observation.
The sources cited above state that the Fasli calendar both follows the Gregorian and was such that New Year's Day coincided with vernal equinox. These two statements are incompatible. The Fasli calendar cannot track both the Gregorian leap years and strictly start on the vernal equinox; further, any calendar strictly tied to the 'day of the ...