أدوات إنتوسوفت

Jakarta to AST

-11h

Jakarta

WIBSOURCE
Indonesia · UTC+07:00
HH12
:
MM00
  
12:00 (24-hr)
12 AM6 AM12 PM6 PM12 AM

AST

AST
UTC-03:00☀ DST active
HH01
:
MM00
  
01:00 (24-hr)
12 AM6 AM12 PM6 PM12 AM
Jakarta
AST
12:00 AM
2:00 PM-1
2:00 AM
4:00 PM-1
4:00 AM
6:00 PM-1
6:00 AM
8:00 PM-1
8:00 AM
10:00 PM-1
10:00 AM
12:00 AM
12:00 PM
2:00 AM
2:00 PM
4:00 AM
4:00 PM
6:00 AM
6:00 PM
8:00 AM
8:00 PM
10:00 AM
10:00 PM
12:00 PM

Green rows indicate typical business hours (9 AM - 5 PM)

WIB and AST on the World Map

The map below highlights the WIB (Western Indonesia Time) and AST (Atlantic Standard Time) timezone regions across the globe.

WIBASTJakartaSurabayaBandungMedanHalifaxSan JuanSanto DomingoCaracas
WIB Zone
→
AST Zone

Explore all world timezones interactively →

WIB – Western Indonesia Time

UTC+07:00

Western Indonesia Time (WIB, UTC+07:00) covers Java, Sumatra and West Kalimantan, including Jakarta.

Countries in WIB
Indonesia (Java, Sumatra, West Kalimantan)
Major Cities in WIB
JakartaSurabayaBandungMedanPalembang
Key Facts about WIB
  • •Indonesia spans three time zones: WIB (UTC+07:00), WITA (UTC+08:00) and WIT (UTC+09:00).
  • •Indonesia has not observed daylight saving time since 1964.
  • •Jakarta is the largest city in Southeast Asia by population.
  • •WIB shares the UTC+07:00 offset with Indochina Time.
Daylight Saving:No – UTC+07:00 year-round
Learn more about WIB on Wikipedia

AST – Atlantic Standard Time

UTC-04:00

Atlantic Standard Time (AST) is the time zone for the Canadian Atlantic provinces and the Caribbean, 4 hours behind UTC.

Countries in AST
Canada (Atlantic provinces)Puerto RicoUS Virgin IslandsDominican RepublicVenezuelaBoliviaBarbadosTrinidad and Tobago
Major Cities in AST
HalifaxSan JuanSanto DomingoCaracasLa PazFrederictonCharlottetown
Key Facts about AST
  • •Puerto Rico uses AST year-round and does not observe DST.
  • •AST is 1 hour ahead of EST.
  • •Halifax, the capital of Nova Scotia, is the largest city in AST Canada.
Daylight Saving:Yes – switches to ADT
Learn more about AST on Wikipedia

About Jakarta

Wikipedia

Jakarta operates on Western Indonesia Time (WIB), UTC+7. As Southeast Asia's largest economy, Jakarta's IDX is a key emerging market exchange.

Population:10.5 million
Metro:34.5 million
Business Hours:8:00 AM - 5:00 PM WIB
Currency:IDR (Rp)
Stock Exchange:IDX (Indonesia Stock Exchange)
Key Landmarks
MonasIstiqlal MosqueOld Town (Kota Tua)Taman MiniAncol Dreamland
Did You Know?

Indonesia has 3 time zones; Jakarta uses Western Indonesia Time (WIB).

Learn more about WIB timezone →

Time Conversion Guide: Jakarta to AST

Jakarta runs on Western Indonesia Time (WIB) at UTC+07:00. AST runs on Atlantic Standard Time (AST) at UTC-04:00. That puts Jakarta 11 hours behind AST — a difference of -11h at the current offsets.

In practice, when it is 9:00 AM in Jakarta it is 10:00 PM in AST on the previous day. Midnight in Jakarta is 1:00 PM in AST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Jakarta to AST time conversion table

Jakarta (WIB)AST (AST)Day
12:00 AM1:00 PMprevious day
6:00 AM7:00 PMprevious day
7:00 AM8:00 PMprevious day
8:00 AM9:00 PMprevious day
9:00 AM10:00 PMprevious day
12:00 PM1:00 AMsame day
3:00 PM4:00 AMsame day
5:00 PM6:00 AMsame day
6:00 PM7:00 AMsame day
9:00 PM10:00 AMsame day

Why people convert Jakarta to AST time

  • Scheduling a call from Jakarta to AST: a 10:00 AM start in Jakarta lands at 11:00 PM in AST the previous day, so you can confirm the slot without doing the arithmetic yourself.
  • Handling a -11h gap: Jakarta and AST have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in AST is 10:00 PM in Jakarta.
  • Watching a live event or market open: Jakarta viewers need 10:00 PM in AST to catch a 9:00 AM start there, and 11:00 AM if the event is anchored to Jakarta.
  • Always state the zone abbreviation, not just the hour. "3:00 PM WIB" is unambiguous; "3 PM" across a -11h gap is not.
  • With a -11h gap there is no shared 9-to-5 window, so alternate the early start: one week Jakarta takes the early slot, the next week AST does.

About WIB (Western Indonesia Time)

Western Indonesia Time (WIB, Waktu Indonesia Barat) is one of Indonesia's three time zones, fixed at UTC+07:00 all year. It covers Java, Sumatra, West Kalimantan and the provinces around them — home to Jakarta, the country's capital and largest city, plus Surabaya and Bandung. Indonesia does not observe daylight saving time, so WIB never shifts. WIB shares its UTC+07:00 offset with Indochina Time (ICT) and Christmas Island Time, but is a distinct zone covering the western half of the Indonesian archipelago. The country's other zones are WITA (UTC+08:00) in the centre and WIT (UTC+09:00) in the east.

About AST (Atlantic Standard Time)

Atlantic Standard Time (AST) covers Canada's Atlantic provinces (Nova Scotia, New Brunswick, Prince Edward Island, and most of Labrador), as well as several Caribbean nations. Puerto Rico and the US Virgin Islands use AST year-round without daylight saving time. The Canadian provinces switch to Atlantic Daylight Time (ADT) in summer.

Best time to call between Jakarta and AST

With a -11h offset there is no overlap inside a normal 9 AM – 5 PM day. AST opens at 9:00 AM AST, which is 10:00 PM in Jakarta, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

Jakarta and AST have no shared working hours because of the -11h gap. Teams need to alternate early starts or rely on asynchronous handovers.

Jakarta is 11 hours behind AST (WIB UTC+07:00 → AST UTC-04:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

Jakarta

Does not observe DST

AST

☀ Currently in DST

Standard: UTC-04:00 · DST: UTC-03:00

Clocks fall back on Sun, Nov 1, 2026

Learn More About Time

Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:

⏳
History of Timekeeping
From sundials to atomic clocks - 5000 years of measuring time
🌍
How Time Zones Work
UTC, offsets, and why zones don't follow straight lines
☀️
Daylight Saving Time
DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between Jakarta and AST?

Jakarta (WIB, UTC+07:00) is 11 hours behind AST (AST, UTC-04:00). The gap is currently -11h.

How do I convert Jakarta time to AST time?

Add -11h to Jakarta local time. For example, 9:00 AM in Jakarta is 10:00 PM in AST (previous day).

What time is it in AST right now?

AST uses AST at UTC-04:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -11h offset from Jakarta.

What is the best time to call AST from Jakarta?

There is no shared working-hours window because of the -11h gap. The closest option is 1:00 PM in Jakarta, which is 2:00 AM in AST.

Which is behind, Jakarta or AST?

Jakarta is 11 hours behind AST. When it is 12:00 PM in Jakarta it is 1:00 AM in AST.

Do Jakarta and AST use different time zones?

Jakarta (Indonesia) uses WIB at UTC+07:00, while AST uses AST at UTC-04:00. The IANA identifiers are Asia/Jakarta and America/Halifax.

Does daylight saving time affect the Jakarta–AST difference?

Neither zone observes daylight saving time, so the -11h offset between Jakarta and AST is fixed all year.

Which other cities share Jakarta's time zone?

WIB also covers Jakarta, Surabaya, Bandung, Medan, Palembang.

Which countries use WIB, Jakarta's zone?

WIB is used in Indonesia (Java, Sumatra, West Kalimantan).

Is there a day difference between Jakarta and AST?

Not normally. The -11h gap only pushes the date over the previous day.

What is the time difference between Jakarta and AST?

AST is -11h from Jakarta.

What timezone is Jakarta in?

Jakarta operates on Western Indonesia Time (WIB), UTC+7. As Southeast Asia's largest economy, Jakarta's IDX is a key emerging market exchange.

What timezone is AST in?

AST operates on its local timezone.

What are the business hours in Jakarta?

Standard business hours in Jakarta are 8:00 AM - 5:00 PM WIB.

Which countries use WIB (Western Indonesia Time)?

WIB is used in Indonesia (Java, Sumatra, West Kalimantan).

Does WIB observe daylight saving time?

No, WIB does not observe daylight saving time and remains at UTC+07:00 year-round.

What are some interesting facts about WIB?

Indonesia spans three time zones: WIB (UTC+07:00), WITA (UTC+08:00) and WIT (UTC+09:00). Indonesia has not observed daylight saving time since 1964.

Which cities are in the AST timezone?

Major cities in the AST timezone include Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.

What is the UTC offset for AST?

Atlantic Standard Time (AST) is at UTC-04:00. During daylight saving time, it shifts to ADT.

What should I know about the AST timezone?

Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.

When is it midnight in Jakarta, what time is it in AST?

When it is 12:00 AM (midnight) in Jakarta (WIB), it is -11h later in AST (AST).

Related Developer Tools

Explore more tools that work great with timezone conversions for international teams:

Unix Timestamp Converter
Convert timestamps to dates across timezones
Date Converter
Convert dates between different formats
Cron Expression Generator
Schedule tasks across different timezones
World Timezone Explorer
Interactive map of all world timezones
Date Calculator
Calculate date differences and durations
Word Counter
Count words for international content

Related Timezone Conversions

jakarta→wibjakarta→indonesiajakarta→new yorkjakarta→londonast→halifaxast→new yorkast→londonast→dubai

More Jakarta time conversions

See every conversion from Jakarta →·See every conversion from AST →

View all timezone conversions →