▁and ▁birth days ▁of ▁G uru ▁Nan ak ▁and ▁G uru ▁G ob ind ▁Singh ▁differ ed ▁from ▁the ▁corresponding ▁dates ▁in ▁the ▁B ik ram i ▁calendar . ▁In ▁ 2 0 0 9 , ▁S G PC ▁am ended ▁the ▁calendar ▁and ▁fixed ▁the ▁dates ▁of ▁these ▁festiv als ▁according ▁to ▁the ▁B ik ir ami ▁calendar . ▁In ▁ 2 0 1 4 – 1 5 , ▁according ▁to ▁the ▁am ended ▁Nan ak sh ah i ▁calendar , ▁G uru ▁G ob ind ▁Singh ' s ▁birth day ▁fell ▁on ▁ 2 8 ▁December ▁ 2 0 1 4 , ▁which ▁over laps ▁with ▁the ▁mart yr dom ▁day ▁of ▁his ▁younger ▁sons . ▁To ▁resolve ▁this , ▁S G PC ▁announced ▁ 7 ▁January ▁ 2 0 1 5 ▁as ▁the ▁new ▁date ▁for ▁celebr ating ▁G uru ▁G ob ind ▁Singh ' s ▁birth day . ▁Later , ▁S G PC ▁back track ed ▁and ▁re - ann ounced ▁ 2 8 ▁December ▁ 2 0 1 4 ▁as ▁the ▁date ▁for ▁the ▁event . ▁As ▁per ▁the ▁ 2 0 0 3 ▁Nan ak sh ah i ▁calendar , ▁the ▁date ▁of ▁this ▁event ▁was ▁ 5 ▁January . ▁N and gar h ▁asked ▁people ▁to ▁celebr ate ▁the ▁event ▁on ▁ 5 ▁January . ▁He ▁was ▁supported ▁by ▁various ▁other ▁S ikh ▁organizations ▁which ▁demanded ▁that ▁the ▁ 2 0 0 3 ▁Nan ak sh ah i ▁calendar ▁should ▁be ▁re - im plement ed