The line approximating 180 degrees East or West along which the date changes due to the switch from zone times +12 to -12 and vice versa.
Umgca umalunga neqondo elili-180 eMpuma okanye eNtshona apho umhla utshintsha khona ngenxa yokuyokutshintshela kumaxesha ommandla angala - +12 ukuya -12 ngokutshinayo.