RE: Guru Gobind Singh Ji Gurpurab Celebrated at Delhi
Dear S. Sarabjot Singh Jee, New Delhi, 

 Waheguru jee ka Khalsa 
 Waheguru jee kee Fateh

    Thanks for your feedback. By adoption of another ‘Almanac’ in 1751, it does not mean  that all the past Dates
 could be altered when length of the year 365/366 Days remain same.
  Look ! December 22 changes to 5th January, now this year it is changed to 7th January !!!
Also celebration of Birth Days is nothing but imitating Christians, Hindus and other religions  as they celebrate
 X’Mas, Ram Naumi, Ashtami, and their Founders, etc.
Gurbani reminds us daily:
 “Pita Ka Janam  Ke Janaiy Poot.” (GGS page 284, 3.16)

Gurmit Singh