Nanakshahi calendar designed by Pal Singh Purewal to replace the Bikrami calendar. The epoch of this calendar is the birth of the first Sikh Guru, Nanak Dev in 1469 and the Nanakshahi year commences on 1 Chet. New Year's Day falls annually on what is March 14 in the Gregorian Western calendar. The start of each month is fixed. According to Kapel (2006), the solar accuracy of the Nanakshahi calendar is linked to the Gregorian civil calendar. This is because the Nanaskhahi calendar uses the tropical year instead of using the sidereal year which is used in the Bikrami calendar or the
Arabic names of calendar months are regional variations of the Berber calendar, since some communities did not recognise the Julian 29 February in century years where the Gregorian calendar had no equivalent date. When Morocco adopted the Gregorian calendar for civil purposes, the names of the months were taken from this local tradition. Arabic names of calendar months The Arabic names of calendar months of the Gregorian calendar are usually phonetic Arabic pronunciations of the corresponding month names used in European languages. An exception is the Assyrian calendar used in Iraq and the Levant, which is inherited from Classical Arabic that correspond to roughly the