The world is divided into 24 primary time zones, each offset from Coordinated Universal Time (UTC). Some zones use half-hour or quarter-hour offsets (like India at UTC+5:30 or Nepal at UTC+5:45).
UTC-12 to UTC-10: Pacific islands, Hawaii, parts of Alaska. UTC-9 to UTC-7: Alaska, US/Canada Pacific, Mountain. UTC-6 to UTC-5: US/Canada Central, Eastern, Mexico. UTC-4 to UTC-3: Atlantic Canada, Brazil, Argentina. UTC-2 to UTC-1: Mid-Atlantic, Azores, Cape Verde. UTC+0: UK, Ireland, Portugal, Iceland, West Africa. UTC+1 to UTC+2: Central/Eastern Europe, South Africa. UTC+3 to UTC+4: Moscow, East Africa, Gulf states. UTC+5 to UTC+5:30: Pakistan, India. UTC+6 to UTC+7: Bangladesh, Thailand, Vietnam. UTC+8: China, Singapore, Hong Kong, Philippines, Western Australia. UTC+9: Japan, South Korea. UTC+10 to UTC+11: Eastern Australia, Pacific islands. UTC+12 to UTC+13: New Zealand, Fiji, Samoa.