▁was ▁chosen ▁with ▁reference ▁to ▁a ▁central ▁station , ▁and ▁that ▁the ▁exp anse ▁of ▁the ▁Indian ▁State ▁was ▁not ▁large ." ▁ ▁Though ▁the ▁government ▁has ▁consist ently ▁refused ▁to ▁split ▁the ▁country ▁into ▁multiple ▁time ▁zones , ▁prov isions ▁in ▁labour ▁laws ▁such ▁as ▁the ▁Plant ations ▁Labour ▁Act , ▁ 1 9 5 1 ▁allow ▁the ▁Central ▁and ▁State ▁govern ments ▁to ▁define ▁and ▁set ▁the ▁local ▁time ▁for ▁a ▁particular ▁industrial ▁area . ▁In ▁Ass am , ▁tea ▁gard ens ▁follow ▁a ▁separate ▁time ▁zone , ▁known ▁as ▁the ▁Cha ib aga an ▁or ▁Bag an ▁time ▁(' Te a ▁Garden ▁Time '), ▁which ▁is ▁one ▁hour ▁ahead ▁of ▁I ST . ▁ ▁Still ▁Indian ▁Standard ▁Time ▁remains ▁the ▁only ▁officially ▁used ▁time . ▁ ▁The ▁film maker ▁Jah nu ▁Bar ua ▁has ▁been ▁campaign ing ▁for ▁a ▁separate ▁time ▁zone ▁( day light ▁saving ▁time ) ▁for ▁the ▁past ▁ 2 5 ▁years . ▁In ▁ 2 0 1 0 , ▁he ▁suggested ▁creating ▁a ▁separate ▁time ▁zone ▁for ▁the ▁Development ▁of ▁N ort he astern ▁Region . ▁In ▁ 2 0 1 4 , ▁Chief ▁Minister ▁of ▁Ass am ▁Tar un ▁G og oi ▁started ▁campaign ing ▁for ▁another ▁time ▁zone ▁for ▁Ass am ▁and ▁other ▁n ort he astern ▁states ▁of ▁India . ▁However , ▁the ▁proposal ▁would ▁need ▁to ▁be ▁cleared ▁by ▁the ▁Central ▁Government ▁of ▁India . ▁ ▁In ▁June ▁ 2 0 1 7 , ▁Department ▁of ▁Science ▁and ▁Technology ▁( D ST