Illinois, USA
Japan Standard Time
GMT +9
South Korea

Time Difference

CST (Central Standard Time) is 15 hours behind Japan Standard Time and 15 hours behind KST (Korea Standard Time)
8:00 pm20:00 in Chicago, IL, USA is 11:00 am11:00 in JST and is 11:00 am11:00 in Seoul, South Korea

Chicago to JST call time
Best time for a conference call or a meeting is between 5:30am-7:30am in Chicago which corresponds to 8:30pm-10:30pm in JST
Chicago to Seoul call time
Best time for a conference call or a meeting is between 5:30am-7:30am in Chicago which corresponds to 8:30pm-10:30pm in Seoul

8:00 pm20:00 CST (Central Standard Time) (Chicago, IL, USA). Offset UTC -6:00 hours
11:00 am11:00 Japan Standard Time (JST). Offset UTC +9:00 hours
11:00 am11:00 KST (Korea Standard Time) (Seoul, South Korea). Offset UTC +9:00 hours

8:00 pm20:00 Chicago, IL, USA / 11:00 am11:00 JST / 11:00 am11:00 Seoul, South Korea

Chicago, IL, USA JST Seoul, South Korea
12am (midnight) 3pm 3pm
1am 4pm 4pm
2am 5pm 5pm
3am 6pm 6pm
4am 7pm 7pm
5am 8pm 8pm
6am 9pm 9pm
7am 10pm 10pm
8am 11pm 11pm
9am 12am (midnight) 12am (midnight)
10am 1am 1am
11am 2am 2am
12pm (noon) 3am 3am
1pm 4am 4am
2pm 5am 5am
3pm 6am 6am
4pm 7am 7am
5pm 8am 8am
6pm 9am 9am
7pm 10am 10am
8pm 11am 11am
9pm 12pm (noon) 12pm (noon)
10pm 1pm 1pm
11pm 2pm 2pm
0:00 15:00 15:00
1:00 16:00 16:00
2:00 17:00 17:00
3:00 18:00 18:00
4:00 19:00 19:00
5:00 20:00 20:00
6:00 21:00 21:00
7:00 22:00 22:00
8:00 23:00 23:00
9:00 0:00 0:00
10:00 1:00 1:00
11:00 2:00 2:00
12:00 3:00 3:00
13:00 4:00 4:00
14:00 5:00 5:00
15:00 6:00 6:00
16:00 7:00 7:00
17:00 8:00 8:00
18:00 9:00 9:00
19:00 10:00 10:00
20:00 11:00 11:00
21:00 12:00 12:00
22:00 13:00 13:00
23:00 14:00 14:00

Chicago Information

Time Zone

Abbreviation / Name
CST - Central Standard Time
CDT - Central Daylight Time
UTC / GMT Offset
-6:00 hours during Central Standard Time, currently in use.
-5:00 hours during Central Daylight Time.
Daylight Saving Time Change
+1:00 hour - DST is NOT in use
Daylight Saving Time Starts
Daylight saving time clock moves forward for one hour from 2am to 3am Sunday, March 13, 2022 at 2:00 am local time. DST starts annually the on second Sunday of March. Clocks are turned forward 1 hour to Sunday, March 13, 2022, 3:00 am local daylight time instead. Also called Spring Forward or Summer Time.
Daylight Saving Time Ends
Daylight saving time clock moves back for one hour from 2am to 1am Sunday, November 6, 2022 at 2:00 am local time. DST ends annually the on first Sunday of November. Clocks are turned backward 1 hour to Sunday, November 6, 2022, 1:00 am local standard time instead. Also called Fall Back or switch to Winter Time.

Chicago Facts

Alternative Names
CHI, Cekaga, Chi-ka-ko, Chi-kâ-kô, Chicago, Chicagu, Chikago, Chykaga, Cikaga, Cikago, Cikaqo, E-Chicago, Kikako, Shikago, Sicagum, Sikago, The Windy City, Tsikago, Windy City, chikhako, cikago, cikako, shikago, shkagw, shykaghw, shykagw, shykajw, shyqgw, sikago, sikkagea, syqgw, zhi jia ge, Çikago, Çikaqo, Ĉikago, Čikaga, Čikago, Čikāga, Čėkaga, Şikago, Σικάγο, Чикаго, Чикаґо, Чыкага, Չիկագո, שיקאגא, שיקגו, شيكاجو, شيكاغو, شکاگو, شیکاگو, شیکاگۆ, ܫܝܩܓܘ, शिकागो, শিকাগো, ਸ਼ਿਕਾਗੋ, சிகாகோ, చికాగో, ಶಿಕಾಗೊ, ഷിക്കാഗോ, ชิคาโก, ရှီကာဂိုမြို့, ჩიკაგო, ሺካጎ, ᓰᖄᑯ, Ṣìkágò, シカゴ, 芝加哥, 시카고, 𐍃𐌾𐌹𐌺𐌰𐌲𐍉
Dollar (USD)
Geographic Coordinates
41° 51' N Latitude / 87° 39' W Longitude
International Dialing Code

Japan Standard Time

Offset: JST is 9 hours ahead Greenwich Mean Time (GMT) and is used in Asia

Countries: It is used in following countries: Japan

Principal Cities: The largest city in the JST timezone is Tokyo from Japan with population about 8.337 million people. Other major cities in the area are Yokohama, Osaka shi, Nagoya shi, Sapporo

Daylight Saving: Japan Standard Time (JST) is not adjusted for daylight saving therefore JST remains the same through out the year. This means, unlike some time zones where the clock is set forward by one hour every summer and backward by one hour during winter to adjust for daylight saving, Japan Standard Time remains the same

JST Time Zone Geo Map
JST timezone map

JST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +09 - basic short
  • +0900 - basic
  • +09:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0900 - sign character (+) followed by a four digit time providing hours (09) and minutes (00) of the offset. Indicates nine hour and zero minutes time differences to the east of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • India - Military abbreviation for JST
  • I - short form of 'India'
IANA/Olson: Reflects JST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Asia/Tokyo
  • Japan
Time zones with the GMT +9 offset:
  • AWDT - Australian Western Daylight Time
  • CHOST - Choibalsan Summer Time
  • I - India Time Zone
  • IRKST - Irkutsk Summer Time
  • JST - Japan Standard Time
  • KST - Korea Standard Time
  • PWT - Palau Time
  • TLT - East Timor Time
  • ULAST - Ulaanbaatar Summer Time
  • WIT - Eastern Indonesian Time
  • YAKT - Yakutsk Time

Seoul Information

Time Zone

Abbreviation / Name
KST - Korea Standard Time
UTC / GMT Offset
+9:00 hours during Korea Standard Time, currently in use.

Seoul Facts

South Korea
Alternative Names
Hanyang, SEL, Seoel, Seol, Seoul, Seoul-si, Seuel, Seul, Seula, Seulas, Seulo, Seulum, Seúl, Seül, Siul, Soeul, Sol, Soul, Sye-ul, Syou-ouen, Szoeul, Szöul, Séoul, Sêûl, Söul, Sŏul, Wang-ching, Wo-jo, Wō-jō, ciyol, han-yang, saul, seoul, seoulsi, seoulteugbyeolsi, seuli, shou er, shou er te bie shi, si'ula, siyola, sol, sola, souru, souru te bie shi, sywl, Σεούλ, Сеул, Соул, Сөүл, Սեուլ, סאול, סיאול, סעאל, سئول, سيول, سیول, سێئول, سېئول, सियोल, सोल, সিউল, சியோல், ಸೌಲ್, സോൾ, โซล, སེ་ཨུལ།, ဆိုးလ်မြို့, სეული, ሶል, សេអ៊ូល, ソウル, ソウル特別市, 首尔, 首尔特别市, 서울, 서울시, 서울특별시, 한양
Won (KRW)
Geographic Coordinates
37° 33' N Latitude / 126° 58' E Longitude
International Dialing Code