Tokyo to Hong Kong to London to New York City to Los Angeles to UTC Time Converter

Tokyo
JapanJST
UTC+9
Sat, Jul 1
12am
3am
6am
9am
12pm
3pm
6pm
9pm
Hong Kong
Hong KongHKT
UTC+8
Sat, Jul 1
1h behind
12am
3am
6am
9am
12pm
3pm
6pm
9pm
London
United KingdomBST
UTC+1
Sat, Jul 1
8h behind
12am
3am
6am
9am
12pm
3pm
6pm
9pm
New York City
New York, USAEDT
UTC−4
Sat, Jul 1
13h behind
12am
3am
6am
9am
12pm
3pm
6pm
9pm
Los Angeles
California, USAPDT
UTC−7
Sat, Jul 1
16h behind
12am
3am
6am
9am
12pm
3pm
6pm
9pm
UTC
Coordinated Universal Time
UTC+0
Sat, Jul 1
9h behind
12am
3am
6am
9am
12pm
3pm
6pm
9pm

Quick answers

Selected conversion

9:00 pm21:00 JST (UTC+9), Jul 1, 2023 = 8:00 pm20:00 HKT (UTC+8), Jul 1, 2023 = 1:00 pm13:00 BST (UTC+1), Jul 1, 2023 = 8:00 am08:00 EDT (UTC-4), Jul 1, 2023 = 5:00 am05:00 PDT (UTC-7), Jul 1, 2023 = 12:00 pm12:00 UTC (UTC+0), Jul 1, 2023

Tokyo is 1 hour ahead of Hong Kong. Tokyo is 8 hours ahead of London. Tokyo is 13 hours ahead of New York City. Tokyo is 16 hours ahead of Los Angeles. Tokyo is 9 hours ahead of UTC.

How the time difference changes

Tokyo to Hong Kong

Tokyo is 1 hour ahead of Hong Kong year-round.

Working hours of 9:00 am to 6:00 pm in Tokyo correspond to 8:00 am to 5:00 pm in Hong Kong.Working hours of 09:00 to 18:00 in Tokyo correspond to 08:00 to 17:00 in Hong Kong.

Tokyo to London

For most of the year, Tokyo is 8 hours ahead of London. From Oct 25, 2026 to Mar 28, 2027, Tokyo is 9 hours ahead of London.

For most of the year, working hours of 9:00 am to 6:00 pm in Tokyo correspond to 1:00 am to 10:00 am in London. At other times of the year, working hours of 9:00 am to 6:00 pm in Tokyo correspond to 12:00 am to 9:00 am in London.For most of the year, working hours of 09:00 to 18:00 in Tokyo correspond to 01:00 to 10:00 in London. At other times of the year, working hours of 09:00 to 18:00 in Tokyo correspond to 00:00 to 09:00 in London.

Tokyo to New York City

For most of the year, Tokyo is 13 hours ahead of New York City. From Nov 1, 2026 to Mar 14, 2027, Tokyo is 14 hours ahead of New York City.

For most of the year, working hours of 9:00 am to 6:00 pm in Tokyo correspond to 8:00 pm (previous day) to 5:00 am in New York City. At other times of the year, working hours of 9:00 am to 6:00 pm in Tokyo correspond to 7:00 pm (previous day) to 4:00 am in New York City.For most of the year, working hours of 09:00 to 18:00 in Tokyo correspond to 20:00 (previous day) to 05:00 in New York City. At other times of the year, working hours of 09:00 to 18:00 in Tokyo correspond to 19:00 (previous day) to 04:00 in New York City.

Tokyo to Los Angeles

For most of the year, Tokyo is 16 hours ahead of Los Angeles. From Nov 1, 2026 to Mar 14, 2027, Tokyo is 17 hours ahead of Los Angeles.

For most of the year, working hours of 9:00 am to 6:00 pm in Tokyo correspond to 5:00 pm (previous day) to 2:00 am in Los Angeles. At other times of the year, working hours of 9:00 am to 6:00 pm in Tokyo correspond to 4:00 pm (previous day) to 1:00 am in Los Angeles.For most of the year, working hours of 09:00 to 18:00 in Tokyo correspond to 17:00 (previous day) to 02:00 in Los Angeles. At other times of the year, working hours of 09:00 to 18:00 in Tokyo correspond to 16:00 (previous day) to 01:00 in Los Angeles.

Tokyo to UTC

Tokyo is 9 hours ahead of UTC year-round.

Working hours of 9:00 am to 6:00 pm in Tokyo correspond to 12:00 am to 9:00 am in UTC.Working hours of 09:00 to 18:00 in Tokyo correspond to 00:00 to 09:00 in UTC.

Compare Tokyo time with Hong Kong, London, New York City, Los Angeles, and UTC time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.

Time Difference

JST (Japan Standard Time) is 1 hour ahead of HKT (Hong Kong Time). JST (Japan Standard Time) is 8 hours ahead of BST (British Summer Time). JST (Japan Standard Time) is 13 hours ahead of EDT (Eastern Daylight Time). JST (Japan Standard Time) is 16 hours ahead of PDT (Pacific Daylight Time). JST (Japan Standard Time) is 9 hours ahead of Coordinated Universal Time.
9:00 pm21:00 in Tokyo, Japan is 8:00 pm20:00 in Hong Kong, Hong Kong and is 1:00 pm13:00 in London, United Kingdom and is 8:00 am08:00 in New York City, NY, USA and is 5:00 am05:00 in Los Angeles, CA, USA and is 12:00 pm12:00 in UTC

Tokyo to Hong Kong call time
Best time for a conference call or a meeting is between 10am-6pm10:00-18:00 in Tokyo which corresponds to 9am-5pm09:00-17:00 in Hong Kong
Tokyo to London call time
Best time for a conference call or a meeting is between 5pm-6pm17:00-18:00 in Tokyo which corresponds to 9am-10am09:00-10:00 in London
Tokyo to New York City call time
Best time for a conference call or a meeting is between 7:30am-8:30am07:30-08:30 in Tokyo which corresponds to 6:30pm-7:30pm18:30-19:30 in New York City (previous day). Their 9am–6pm09:00–18:00 working hours do not overlap; this is a suggested compromise.
Tokyo to Los Angeles call time
Best time for a conference call or a meeting is between 9am-10am09:00-10:00 in Tokyo which corresponds to 5pm-6pm17:00-18:00 in Los Angeles (previous day)
Tokyo to UTC call time
Best time for a conference call or a meeting is between 5:30pm-6:30pm17:30-18:30 in Tokyo which corresponds to 8:30am-9:30am08:30-09:30 in UTC. Their 9am–6pm09:00–18:00 working hours do not overlap; this is a suggested compromise.

9:00 pm21:00 JST (Japan Standard Time) (Tokyo, Japan). Offset UTC +9:00 hours
8:00 pm20:00 HKT (Hong Kong Time) (Hong Kong, Hong Kong). Offset UTC +8:00 hours
1:00 pm13:00 BST (British Summer Time) (London, United Kingdom). Offset UTC +1:00 hour
8:00 am08:00 EDT (Eastern Daylight Time) (New York City, NY, USA). Offset UTC -4:00 hours
5:00 am05:00 PDT (Pacific Daylight Time) (Los Angeles, CA, USA). Offset UTC -7:00 hours
12:00 pm12:00 Coordinated Universal Time (UTC). Offset UTC 0:00 hours

9:00 pm21:00 Tokyo, Japan / 8:00 pm20:00 Hong Kong, Hong Kong / 1:00 pm13:00 London, United Kingdom / 8:00 am08:00 New York City, NY, USA / 5:00 am05:00 Los Angeles, CA, USA / 12:00 pm12:00 UTC

Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.

Hourly time comparison
Tokyo, JapanHong Kong, Hong KongLondon, United KingdomNew York City, NY, USALos Angeles, CA, USAUTC
11:00pm previous day4:00pm previous day11:00am previous day8:00am previous day3:00pm previous day
12:00am5:00pm previous day12:00pm previous day9:00am previous day4:00pm previous day
1:00am6:00pm previous day1:00pm previous day10:00am previous day5:00pm previous day
2:00am7:00pm previous day2:00pm previous day11:00am previous day6:00pm previous day
3:00am8:00pm previous day3:00pm previous day12:00pm previous day7:00pm previous day
4:00am9:00pm previous day4:00pm previous day1:00pm previous day8:00pm previous day
5:00am10:00pm previous day5:00pm previous day2:00pm previous day9:00pm previous day
6:00am11:00pm previous day6:00pm previous day3:00pm previous day10:00pm previous day
7:00am12:00am7:00pm previous day4:00pm previous day11:00pm previous day
8:00am1:00am8:00pm previous day5:00pm previous day12:00am
9:00am2:00am9:00pm previous day6:00pm previous day1:00am
10:00am3:00am10:00pm previous day7:00pm previous day2:00am
11:00am4:00am11:00pm previous day8:00pm previous day3:00am
12:00pm5:00am12:00am9:00pm previous day4:00am
1:00pm6:00am1:00am10:00pm previous day5:00am
2:00pm7:00am2:00am11:00pm previous day6:00am
3:00pm8:00am3:00am12:00am7:00am
4:00pm9:00am4:00am1:00am8:00am
5:00pm10:00am5:00am2:00am9:00am
6:00pm11:00am6:00am3:00am10:00am
7:00pm12:00pm7:00am4:00am11:00am
8:00pm1:00pm8:00am5:00am12:00pm
9:00pm2:00pm9:00am6:00am1:00pm
10:00pm3:00pm10:00am7:00am2:00pm
23:00 previous day16:00 previous day11:00 previous day08:00 previous day15:00 previous day
00:0017:00 previous day12:00 previous day09:00 previous day16:00 previous day
01:0018:00 previous day13:00 previous day10:00 previous day17:00 previous day
02:0019:00 previous day14:00 previous day11:00 previous day18:00 previous day
03:0020:00 previous day15:00 previous day12:00 previous day19:00 previous day
04:0021:00 previous day16:00 previous day13:00 previous day20:00 previous day
05:0022:00 previous day17:00 previous day14:00 previous day21:00 previous day
06:0023:00 previous day18:00 previous day15:00 previous day22:00 previous day
07:0000:0019:00 previous day16:00 previous day23:00 previous day
08:0001:0020:00 previous day17:00 previous day00:00
09:0002:0021:00 previous day18:00 previous day01:00
10:0003:0022:00 previous day19:00 previous day02:00
11:0004:0023:00 previous day20:00 previous day03:00
12:0005:0000:0021:00 previous day04:00
13:0006:0001:0022:00 previous day05:00
14:0007:0002:0023:00 previous day06:00
15:0008:0003:0000:0007:00
16:0009:0004:0001:0008:00
17:0010:0005:0002:0009:00
18:0011:0006:0003:0010:00
19:0012:0007:0004:0011:00
20:0013:0008:0005:0012:00
21:0014:0009:0006:0013:00
22:0015:0010:0007:0014:00

Tokyo Time Zone and Facts

Time Zone

Abbreviation / Offset
JST – Japan Standard Time, UTC+9 (no daylight saving time)

Tokyo Facts

Country
Japan
Alternative Names
Edo, TYO, Tochiu, Tocio, Tokija, Tokijas, Tokio, Tokió, Tokjo, Tokyo, Toquio, Toquio - dong jing, Toquio - 東京, Tòquio, Tókýó, Tóquio, Tōkyō, dokyo, dong jing, dong jing dou, dong-gyeong, tokeiyw, toki'o, tokkiyo, tokyo, twkyw, twqyw, Τόκιο, Токио, Токё, Токіо, Տոկիո, טוקיו, توكيو, توکیو, طوكيو, ܛܘܟܝܘ, ܜܘܟܝܘ, टोक्यो, টোকিও, டோக்கியோ, โตเกียว, ტოკიო, 东京, 東京, 東京都, 도쿄, 동경
Population
9,733,276
Currency
Yen (JPY)
Geographic Coordinates
35° 41' N Latitude / 139° 41' E Longitude
International Dialing Code
+81
More About Tokyo
Tokyo time now
Current Time in Japan
Japan time now

Hong Kong Time Zone and Facts

Time Zone

Abbreviation / Offset
HKT – Hong Kong Time, UTC+8 (no daylight saving time)

Hong Kong Facts

Country
Hong Kong
Alternative Names
Chon'nk Kon'nk, Gankong, Gon Kong, Gonkong, HKG, Hiong-geng, Hiŏng-gē̤ng, Hong Kong, Hongkong, Honkong, Hồng Kông, Khongkong, Khonkong, Victoria, ankan, hamga kamga, hanakana, hang kang, hang kang nagaram, hangakanga, hang‌kang, hankam, heankean, hng kng, hon'ga kon'ga, hong-kʼongi, hongakonga, hongkong, honkongu, hwng kwng, hwng qwng, hwngh kwngh, hwnj kwnj, hxngkng, hʼng qʼng, shyanggang, xiang gang, Χονγκ Κονγκ, Ганконг, Гонконг, Хонгконг, Хонконг, Һoң Koң, Һоң Коң, Հոնկոնգ, האנג קאנג, הונג קונג, شياڭگاڭ, هانگ کانگ, هنگ کنگ, هونج كونج, هونغ كونغ, هونگ کونگ, ھwng kwng, ھونگ کونگ, ھۆng kۆng, ھۆنگ کۆنگ, ہang kang, ہانگ کانگ, ހޮންކޮންގު, हङकङ, हाँग काँग, हांगकांग, हांग् कांग् नगरम्, हॉन्ग कॉन्ग, হংকং, ਹਾਂਗਕਾਂਗ, હોંગકોંગ, ହଂକଂ, ஆங்காங், హాంగ్‌కాంగ్, ಹಾಂಗ್ ಕಾಂಗ್, ഹോങ്കോങ്, හොංකොං, ฮ่องกง, ཧང་ཀང་།, ཧོང་ཀོང་།, ဟောငကောင, ဟောင်ကောင်, ჰონგ-კონგი, ሆንግ ኮንግ, ហងកង, ហុងកុង, 香港, 홍콩
Population
7,396,076
Currency
Dollar (HKD)
Geographic Coordinates
22° 16' N Latitude / 114° 10' E Longitude
International Dialing Code
+852
More About Hong Kong
Hong Kong local time and city facts

London Time Zone and Facts

Time Zone

Abbreviation / Offset
BST – British Summer Time, UTC+1 (now, daylight saving time)
GMT – Greenwich Mean Time, UTC+0 (standard time)
Daylight Saving Time Ends
123456789101112Sunday, October 25, 2026 at 2:00 amSunday, October 25, 2026 at 02:00: clocks go back 1 hour to 1:00 am01:00 (GMT). DST ends on the last Sunday of October each year. Also called Fall Back or Winter Time.
Daylight Saving Time Starts
123456789101112Sunday, March 28, 2027 at 1:00 amSunday, March 28, 2027 at 01:00: clocks go forward 1 hour to 2:00 am02:00 (BST). DST starts on the last Sunday of March each year. Also called Spring Forward or Summer Time.
Clock Changes
United Kingdom daylight saving time · Clock changes worldwide

London Facts

Country
United Kingdom
Alternative Names
ILondon, LON, Lakana, Landan, Landen, Ljondan, Llundain, Lodoni, Londain, Londan, Londar, Londe, Londen, Londin, Londinium, Londino, Londn, London, London osh, Londona, Londonas, Londoni, Londono, Londons, Londonu, Londra, Londres, Londrez, Londri, Londro, Londye, Londyn, Londýn, Lonn, Lontoo, Loundres, Luan GJon, Lun-tun, Lunden, Lundra, Lundun, Lundunir, Lundúnir, Lung-dung, Lunnainn, Lunnin, Lunnon, Luân Đôn, Lùn-tûn, Lùng-dŭng, Lûn-tun, Lākana, Lůndůn, Lọndọnu, Ranana, Rānana, ilantan, ladana, landan, landana, leondeon, lndn, london, londoni, lun dui, lun dun, lwndwn, lxndxn, rondon, Łondra, Λονδίνο, Лондан, Лондон, Лондон ош, Лондонъ, Лёндан, Լոնդոն, לאנדאן, לונדון, لأندأن, لندن, لوندون, لەندەن, ܠܘܢܕܘܢ, लंडन, लंदन, लण्डन, लन्डन्, लन्दन, লন্ডন, ਲੰਡਨ, લંડન, ଲଣ୍ଡନ, இலண்டன், లండన్, ಲಂಡನ್, ലണ്ടൻ, ලන්ඩන්, ลอนดอน, ລອນດອນ, ལོན་ཊོན།, လန်ဒန်မြို့, ლონდონი, ለንደን, ᎫᎴ ᏗᏍᎪᏂᎯᏱ, ロンドン, 伦敦, 倫敦, 런던
Population
8,961,989
Currency
Pound (GBP)
Geographic Coordinates
51° 30' N Latitude / 0° 07' W Longitude
International Dialing Code
+44
More About London
London time now
Current Time in the United Kingdom
UK time now

New York City Time Zone and Facts

Time Zone

Abbreviation / Offset
EDT – Eastern Daylight Time, UTC-4 (now, daylight saving time)
EST – Eastern Standard Time, UTC-5 (standard time)
Daylight Saving Time Ends
123456789101112Sunday, November 1, 2026 at 2:00 amSunday, November 1, 2026 at 02:00: clocks go back 1 hour to 1:00 am01:00 (EST). DST ends on the 1st Sunday of November each year. Also called Fall Back or Winter Time.
Daylight Saving Time Starts
123456789101112Sunday, March 14, 2027 at 2:00 amSunday, March 14, 2027 at 02:00: clocks go forward 1 hour to 3:00 am03:00 (EDT). DST starts on the 2nd Sunday of March each year. Also called Spring Forward or Summer Time.
Clock Changes
USA daylight saving time · Clock changes worldwide

New York City Facts

Country
USA
State
New York
Alternative Names
Aebura, Bandar Raya New York, Big Apple, Cathair Nua-Eabhrac, City of New York, Eabhraig Nuadh, Efrog Newydd, Evrek Nowydh, Ga-no-no, Kanon:no, Kanono, Kanón:no, Kota New York, Lungsod ng New York, N'ju-Jork, NY, NYC, Nea Yorke, Nei Yarrick Schtadt, Neu Amsterdam, Neu Jorck, New Amsterdam, New Orange, New Yorc, New York, New York City, New York Stad, New York borg, New York kenti, New York-borg, New Yorke, New Yorku, Niujorkas, Nju Jork, Njujork, Nouvelle Yorck, Nouvieau York, Nov-Jorko, Nova Amsterda, Nova Iorque, Nova York, Nova-York, Novjorko, Novum Eboracum, Nowy Jork, Nua-Eabhrac, Nueva York, Nujorka, Nyja Jorvik, Nyu York Shehiri, Nòva York, Nýja Jórvík, Thanh pho New York, The Big Apple, Thành phố New York, York Berri, manhattan, n'yuyorka, ni'u iyarka siti, niu yue, niu yue shi, niyuyark nakaram, nkhr niwyxrk, nyuyog, nyuyog si, nyuyoku, nyw ywrq, nywywrk, Ņujorka, Νέα Υόρκη, Њу Јорк, Њујорк, Нью-Ёрк, Нью-Йорк, Ню Йорк, ניו יארק, ניו יורק, ניו־יאָרק, نيويورك, نیویارک شہر, نیویورک, न्यूयॉर्क, নিউ ইয়র্ক সিটি, நியூயார்க் நகரம், นครนิวยอร์ก, ნიუ-იორკი, ニューヨーク, マンハッタン, 紐約市, 纽约, 뉴욕, 뉴욕 시
Population
8,804,190
Currency
Dollar (USD)
Geographic Coordinates
40° 42' N Latitude / 74° 00' W Longitude
International Dialing Code
+1
More About New York City
New York time now

Los Angeles Time Zone and Facts

Time Zone

Abbreviation / Offset
PDT – Pacific Daylight Time, UTC-7 (now, daylight saving time)
PST – Pacific Standard Time, UTC-8 (standard time)
Daylight Saving Time Ends
123456789101112Sunday, November 1, 2026 at 2:00 amSunday, November 1, 2026 at 02:00: clocks go back 1 hour to 1:00 am01:00 (PST). DST ends on the 1st Sunday of November each year. Also called Fall Back or Winter Time.
Daylight Saving Time Starts
123456789101112Sunday, March 14, 2027 at 2:00 amSunday, March 14, 2027 at 02:00: clocks go forward 1 hour to 3:00 am03:00 (PDT). DST starts on the 2nd Sunday of March each year. Also called Spring Forward or Summer Time.
Clock Changes
USA daylight saving time · Clock changes worldwide

Los Angeles Facts

Country
USA
State
California
Alternative Names
Angelopolis, Ciudad De los Angelos, Cuidad De Los Angelos, El Pueblo de Nuestra Senora La Reina de Los Angeles de Porcivncula, El Pueblo de Nuestra Senora de los Angeles de Porciuncula, El Pueblo de Nuestra Señora de los Ángeles de Porciúncula, El Pueblo del Rio de Nuestra Senora, L.A., LA, LAX, La Reina de Los Angeles de Porciuncula, Lok-chham-ki, Los And'eles, Los Andzelas, Los Andzeles, Los Andzheles, Los Andzhelis, Los Andželas, Los Andželes, Los Angeles, Los Anjeles, Los Anjélés, Los Antzeles, Los Anxheles, Los Anxhelos, Los Anzeles, Los Anzheles, Los Ángeles, Los-Anceles, Los-Andzeles, Los-Andzhehles, Los-Andzheles, Los-Angeleso, Los-Anjeles, Los-Anzheles, Los-Anzheles shaary, Los-Anĝeleso, Losandzelosa, Losandželosa, Lo̍k-chhám-kî, Lungsod ng Los Angeles, Luos Andzels, Luos Andžels, Os Anxeles, Os Ánxeles, Pueblo De Los Angeles, Pueblo Los Angelos, el-ei, las aynjls, las encalas, las enjales, las enjalis, lasa ainjalasa, lasa enjalasa, lasa enjilasa, leas anceles, los-anjelesi, losa enjelasa, losa enjelisa, losa enjelsa, loseuaenjelleseu, loseuenjelleseu, ls anjls, luo shan ji, lws anjls, lws anjlws, lws anjlys, lws ʼngls, rosanzerusu, Λος Άντζελες, Лос Анджелес, Лос Анджелис, Лос Андьелес, Лос Анжелес, Лос Анђелес, Лос Анџелес, Лос Анҷелес, Лос Анӂелес, Лос-Анджелес, Лос-Анджэлес, Лос-Анжелес, Лос-Анжелес шаары, Лос-Анџелес, Լոս Անջելես, לאס אנדזשעלעס, לוס אנגלס, لاس اینجلس, لس آنجلس, لس‌آنجلس, لوس آنجلس, لوس أنجلوس, لوس ئانجېلېس, لوس انجليس, لوس‌آنجلس, لۆس ئانجلەس, लस एञ्जिलस, लस एन्जलस, लास एंजलस, लॉस एंजेलिस, लॉस एंजेल्स, লস অ্যাঞ্জেলেস, ਲਾਸ ਐਂਜਲਸ, લોસ એન્જેલસ, லாஸ் ஏஞ்சலஸ், లాస్ ఏంజలెస్, ಲಾಸ್ ಎಂಜಲೀಸ್, ലോസ് ആഞ്ചെലെസ്, ลอสแอนเจลิส, လော့စ်အိန်ဂျယ်လိစ်မြို့, ლოს-ანჯელესი, ሎስ አንጄሌስ, ロサンゼルス, 洛杉矶, 洛杉磯, 로스앤젤레스, 로스엔젤레스, 엘에이
Population
3,820,914
Currency
Dollar (USD)
Geographic Coordinates
34° 03' N Latitude / 118° 14' W Longitude
International Dialing Code
+1
More About Los Angeles
Los Angeles time now

Coordinated Universal Time

Offset: UTC is the same as Greenwich Mean Time (GMT).

Countries using this time zone: Antarctica, Burkina Faso, Faroe Islands, Gambia, Ghana, Greenland, Guernsey, Guinea, Guinea-Bissau, Iceland, Ireland, Isle of Man, Ivory Coast, Jersey, Liberia, Mali, Mauritania, Morocco, Portugal, Saint Helena, São Tomé and Príncipe, Senegal, Sierra Leone, Spain, Togo, United Kingdom, Western Sahara

Principal Cities: The largest city in the UTC time zone is London in the United Kingdom, with about 8.962 million people. Other major cities in this time zone include Abidjan, Bamako, Casablanca, Dakar.

Coordinated Universal Time (UTC) is the world time standard that regulates clocks and time. It is the successor to Greenwich Mean Time (GMT). For casual use, UTC is the same as GMT, but UTC is the standard the scientific community uses.
UTC has been the time standard commonly used across the world since 1972. It is used in many technical fields, such as aviation and meteorology, and to synchronize time across internet networks.

Map of the areas on Coordinated Universal Time (UTC)
UTC all year UTC part of the year

On July 1, 2023 some shaded areas are on UTC+1 (British Summer Time, Irish Standard Time, WEST).

Open the world time zone map© OpenStreetMap

UTC representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • Z - is the zone designator for the zero UTC/GMT offset, also known as 'Zulu' time
  • +00 - basic short
  • +0000 - basic
  • +00:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0000 - sign character (+) followed by a four digit time providing hours (00) and minutes (00) of the offset. Indicates the zero UTC/GMT offset.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Zulu - Military abbreviation for UTC
  • Z - short form of 'Zulu'
IANA/Olson: Reflects UTC time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Etc/UCT
  • Etc/UTC
  • Etc/Universal
  • Etc/Zulu
  • UCT
  • UTC
  • Universal
  • Zulu
Time zones with the GMT +0 offset:
  • EGST - Eastern Greenland Summer Time
  • GMT - Greenwich Mean Time
  • WET - Western European Time
  • AZOST - Azores Summer Time
  • UTC - Coordinated Universal Time
  • WT - Western Sahara Standard Time
  • Z - Zulu Time Zone
EST to ISTGMT to ESTPST to ESTEST to GMTPST to GMT