Dunia atau bumi iki dibagi dadi 24 zona waktu sing beda-beda, sesuai letak daerah iku.
Waktu universal sing dadi pautan iku waktu GMT, waktu sing ana nang Greenwich, Inggris. Zona waktu biasane dipautkna meng GMT iki.
Zona waktu dihitung berdasar garis bujur sebagai :
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