Your premium real-time portal for Japan Standard Time (JST) and Korea Standard Time (KST). Live clocks for Tokyo, Osaka, Seoul, Busan, Yokohama and the entire East Asia region โ all UTC+9, all in sync.
All major time zones across East Asia explained
All times update every second automatically
| City | Country | Time Zone | Current Time | vs JST/KST |
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Convert any time between East Asia and global cities
East Asia encompasses some of the world's most dynamic economies and cultures, operating primarily across two main time zones: UTC+8 (China, Singapore, Philippines, Taiwan) and UTC+9 (Japan, South Korea). The UTC+9 zone โ shared by Japan Standard Time (JST) and Korea Standard Time (KST) โ is home to two of Asia's most powerful economies: Japan ($4.2 trillion GDP) and South Korea ($1.7 trillion GDP).
One of the most notable features of East Asian timekeeping is that Japan (JST) and South Korea (KST) share identical UTC+9 offsets. This means Tokyo and Seoul always show the same time simultaneously โ despite being different countries with different cultures, languages, and histories. This simplifies business coordination between the region's two largest non-Chinese economies.
East Asian business hours: Japan/Korea 9:00 AM โ 6:00 PM JST/KST (Mon-Fri). China 9:00 AM โ 6:00 PM CST (Mon-Fri). The brief overlap between East Asian trading hours (9:00 AM JST) and late-night European and early-morning American markets drives massive foreign exchange volume. The USD/JPY and USD/KRW pairs are among the most traded globally.
From London (GMT): Call 8:00-10:00 AM GMT to reach East Asia at 5:00-7:00 PM JST/KST. From New York (EST): Call 7:00-9:00 PM EST the previous evening to reach East Asia at 9:00-11:00 AM next day JST. From Los Angeles (PST): Call 4:00-6:00 PM PST to reach East Asia 9:00-11:00 AM next day JST. Avoid calling East Asia during Obon (Japan, August) and Lunar New Year (both countries).
East Asia leads global internet infrastructure. Japan, South Korea, and Singapore consistently rank in the world's top 10 fastest internet speeds. Korea's 5G adoption rate is the world's highest. The Asia trading session (9:00 AM โ 5:00 PM JST) sees peak activity in tech stocks, cryptocurrency (especially Kimchi Premium in Korea), and gaming economies โ all synchronized to UTC+9.
The East Asia tech ecosystem operates at speed: Korean "ppalli-ppalli" (๋นจ๋ฆฌ๋นจ๋ฆฌ) culture demands immediacy, while Japan's precision culture ensures clockwork scheduling. Samsung, LG, Sony, Toyota, and thousands of other multinationals operate on JST/KST time. Major product launches, quarterly earnings, and tech events are often scheduled for 10:00 AM JST for maximum Asia-Pacific coverage before the European market opens.