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
Dilla (month) Gathān Mugah Charhe (गथां मुगः चह्रे) is celebrated on the 14th day of the dark fortnight when evil spirits are chased out of the city limits. Dilla (month) Dillā (Nepal Bhasa: दिल्ला) is the ninth month in the Nepal Era calendar, the national lunar calendar of Nepal. The month coincides with Āsāṛh (आषाढ) in the Hindu lunar calendar and July in the Gregorian calendar. Dillā begins with the new moon and the full moon falls on the 15th of the lunar month. The month is divided into the bright and dark fortnights which are known as Dillā Thwa (दिल्ला थ्व)