WIB to AST
-11hWIB
WIBSOURCEAST
ASTGreen 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.
WIB – Western Indonesia Time
UTC+07:00Western Indonesia Time (WIB, UTC+07:00) covers Java, Sumatra and West Kalimantan, including Jakarta.
- •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.
AST – Atlantic Standard Time
UTC-04:00Atlantic Standard Time (AST) is the time zone for the Canadian Atlantic provinces and the Caribbean, 4 hours behind UTC.
- •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.
Time Conversion Guide: WIB to AST
WIB runs on Western Indonesia Time (WIB) at UTC+07:00. AST runs on Atlantic Standard Time (AST) at UTC-04:00. That puts WIB 11 hours behind AST — a difference of -11h at the current offsets.
In practice, when it is 9:00 AM in WIB it is 10:00 PM in AST on the previous day. Midnight in WIB is 1:00 PM in AST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
WIB to AST time conversion table
| WIB (WIB) | AST (AST) | Day |
|---|---|---|
| 12:00 AM | 1:00 PM | previous day |
| 6:00 AM | 7:00 PM | previous day |
| 7:00 AM | 8:00 PM | previous day |
| 8:00 AM | 9:00 PM | previous day |
| 9:00 AM | 10:00 PM | previous day |
| 12:00 PM | 1:00 AM | same day |
| 3:00 PM | 4:00 AM | same day |
| 5:00 PM | 6:00 AM | same day |
| 6:00 PM | 7:00 AM | same day |
| 9:00 PM | 10:00 AM | same day |
Why people convert WIB to AST time
- Scheduling a call from WIB to AST: a 10:00 AM start in WIB 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: WIB 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 WIB.
- Watching a live event or market open: WIB 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 WIB.
- 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 WIB 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 WIB 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 WIB, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
WIB and AST have no shared working hours because of the -11h gap. Teams need to alternate early starts or rely on asynchronous handovers.
WIB 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
WIB
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:
Frequently Asked Questions
What is the time difference between WIB and AST?
WIB (WIB, UTC+07:00) is 11 hours behind AST (AST, UTC-04:00). The gap is currently -11h.
How do I convert WIB time to AST time?
Add -11h to WIB local time. For example, 9:00 AM in WIB 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 WIB.
What is the best time to call AST from WIB?
There is no shared working-hours window because of the -11h gap. The closest option is 1:00 PM in WIB, which is 2:00 AM in AST.
Which is behind, WIB or AST?
WIB is 11 hours behind AST. When it is 12:00 PM in WIB it is 1:00 AM in AST.
Does daylight saving time affect the WIB–AST difference?
Neither zone observes daylight saving time, so the -11h offset between WIB and AST is fixed all year.
Which other cities share WIB's time zone?
WIB also covers Jakarta, Surabaya, Bandung, Medan, Palembang.
Which countries use WIB, WIB's zone?
WIB is used in Indonesia (Java, Sumatra, West Kalimantan).
Is there a day difference between WIB and AST?
Not normally. The -11h gap only pushes the date over the previous day.
What is the time difference between WIB and AST?
AST is -11h from WIB.
What timezone is WIB in?
WIB operates on its local timezone.
What timezone is AST in?
AST operates on its local timezone.
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 WIB, what time is it in AST?
When it is 12:00 AM (midnight) in WIB (WIB), it is -11h later in AST (AST).
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See every conversion from WIB →·See every conversion from AST →