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
Jyeshtha (month) Jyeshtha (month) Jyeshtha or Jyēṣṭha (; "jēṭ"; "zeth") is a month of the Hindu calendar. In India's national civil calendar, Jyestha is the third month of the year. Known as "Joishtho" ( "Jyôishţhô") in Bengali, it is the second month of the Bengali calendar. In lunar religious calendars, Jyēṣṭha begins on the new moon and is the third month of the year. Traditionally, Jyēṣṭha is associated with high summer, and corresponds to May–June in the Gregorian calendar. In Tamil, the month is known as Aani, the third month of the solar calendar that begins in mid-June. In Vedic Jyotish, Jyēṣṭha