In 1988 Pal Singh Purewal developed the Nanakshahi calendar whose months are named for those in scripture of Guru Granth Sahib. The Nanakshahi calendar which begins mid March was an attempt to fix gurpurab dates to the modern day Western Gregorian calendar and sparked ongoing controversy. Amendments were made to the Nanakshahi Calendar in 2003. For several years Guru Gobind Singh Ji&#39;s birth was fixed to be observed on January 6, however to allow for fluctuations in the Eastern calendar, several later revisions occurred which continue to foster debate.<p>The <a href="https://www.thoughtco.com/sikhism-calendar-nanakshahi-2993223" data-component="link" data-source="inlineLink" data-type="internalLink" data-ordinal="1">2010 Nanakshahi calendar amendment</a> released by the Shiromani Gurdwara Parbandhak Committee (SGPC) designated Guru Gobind Singh&#39;s prakash as January 5, 2010.</p>The gurpurab date of Guru Gobind Singh&#39;s prakash was further amended by SGPC so that the tenth guru&#39;s birth was observed twice in first on Jan 11, 2011 and again December 31, 2011. The time difference between the East and West seemed to be a factor in specifying changes to gurpurab dates. With India hours ahead of the UK and USA (depending on location) nighttime celebrations in the West meant that Sikhs around the world could observe Guru Gobind Singh&#39;s gurpurab simultaneously, as happened on New Year&#39;s Eve December 31, 2011 in the USA, (which happened to be January 1, 2012 in India).According to SGPC Nanakshahi calendar, the tenth guru’s birthday did not occur officially at all in during 2012, though many Sikhs celebrated for sake of convenience on Sunday, January 1, or the following weekend.According to the Nanakshahi calendar released by the Shiromani Gurdwara Parbandhak Committee (SGPC), the official gurpurab date of Guru Gobind Singh’s birth prakash was given as January 18, 2013. Many Sikhs reverted to the 2010 revision date and celebrated the weekend of January 5 and 6.SGPC official gurpurab release date for prakash of Guru Gobind Singh is given as Tuesday January 7, 2014. Celebrations commemorated by Sikhs in the West during the previous weekend on January 4, or 5, of 2014 are held for convenience sake.