▁by ▁the ▁name ▁( standard ▁codes ▁are ▁used ) ▁of ▁the ▁labor atory ▁concerned , ▁and ▁other ▁information ▁such ▁as ▁confidence ▁levels , ▁because ▁of ▁differences ▁between ▁the ▁methods ▁used ▁by ▁different ▁labor ator ies ▁and ▁changes ▁in ▁cal ibr ating ▁methods . ▁ ▁See ▁also ▁Anth rop oc ene ▁ ▁Foot notes ▁ ▁Cit ations ▁▁ ▁Category : Calendar ▁er as ▁Category : Ge och ron ology <0x0A> </s> ▁With draw al ▁from ▁the ▁European ▁Union ▁is ▁the ▁legal ▁and ▁political ▁process ▁where by ▁an ▁EU ▁member ▁state ▁ce ases ▁to ▁be ▁a ▁member ▁of ▁the ▁Union . ▁Article ▁ 5 0 ▁of ▁the ▁Tre aty ▁on ▁European ▁Union ▁( TE U ) ▁states ▁that ▁" Any ▁Member ▁State ▁may ▁decide ▁to ▁withdraw ▁from ▁the ▁Union ▁in ▁accord ance ▁with ▁its ▁own ▁constitution al ▁requirements ". ▁ ▁The ▁Government ▁of ▁the ▁United ▁Kingdom ▁triggered ▁Article ▁ 5 0 ▁to ▁begin ▁the ▁UK ' s ▁withdraw al ▁from ▁the ▁EU ▁in ▁March ▁ 2 0 1 7 ▁following ▁a ▁June ▁ 2 0 1 6 ▁refer endum , ▁and ▁the ▁withdraw al ▁was ▁scheduled ▁in ▁law ▁to ▁occur ▁on ▁ 2 9 ▁March ▁ 2 0 1 9 . ▁Sub sequently , ▁the ▁UK ▁sought , ▁and ▁was ▁granted , ▁a ▁further ▁Article ▁ 5 0 ▁extension ▁until ▁ 3 1 ▁January ▁ 2 0 2 0 . ▁On ▁ 2 3 ▁January ▁ 2 0 2 0 , ▁the ▁With draw al ▁agreement ▁was ▁rat ified ▁by ▁the ▁Parliament ▁of ▁the ▁United