AST to WIB
+11hAST
ASTSOURCEWIB
WIBGreen rows indicate typical business hours (9 AM - 5 PM)
AST and WIB on the World Map
The map below highlights the AST (Atlantic Standard Time) and WIB (Western Indonesia Time) timezone regions across the globe.
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.
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 vs WIB: Offsets, DST and Best Call Times
AST runs on Atlantic Standard Time (AST) at UTC-04:00. WIB runs on Western Indonesia Time (WIB) at UTC+07:00. That puts AST 11 hours ahead of WIB — a difference of +11h at the current offsets.
In practice, when it is 9:00 AM in AST it is 8:00 PM in WIB. Midnight in AST is 11:00 AM in WIB. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AST to WIB time conversion table
| AST (AST) | WIB (WIB) | Day |
|---|---|---|
| 12:00 AM | 11:00 AM | same day |
| 6:00 AM | 5:00 PM | same day |
| 7:00 AM | 6:00 PM | same day |
| 8:00 AM | 7:00 PM | same day |
| 9:00 AM | 8:00 PM | same day |
| 12:00 PM | 11:00 PM | same day |
| 3:00 PM | 2:00 AM | next day |
| 5:00 PM | 4:00 AM | next day |
| 6:00 PM | 5:00 AM | next day |
| 9:00 PM | 8:00 AM | next day |
Why people convert AST to WIB time
- Scheduling a call from AST to WIB: a 10:00 AM start in AST lands at 9:00 PM in WIB, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +11h gap: AST and WIB 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 WIB is 8:00 PM in AST.
- Booking travel or deliveries: tracking WIB local time against AST keeps pickup windows and arrival estimates honest across the +11h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM AST" 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 AST takes the early slot, the next week WIB does.
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.
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.
Best time to call between AST and WIB
With a +11h offset there is no overlap inside a normal 9 AM – 5 PM day. WIB opens at 9:00 AM WIB, which is 8:00 PM in AST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
AST and WIB have no shared working hours because of the +11h gap. Teams need to alternate early starts or rely on asynchronous handovers.
AST is 11 hours ahead of WIB (AST UTC-04:00 → WIB UTC+07:00). 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
AST
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
Clocks fall back on Sun, Nov 1, 2026
WIB
Does not observe DST
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 AST and WIB?
AST (AST, UTC-04:00) is 11 hours ahead of WIB (WIB, UTC+07:00). The gap is currently +11h.
How do I convert AST time to WIB time?
Add +11h to AST local time. For example, 9:00 AM in AST is 8:00 PM in WIB.
What time is it in WIB right now?
WIB uses WIB at UTC+07:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +11h offset from AST.
What is the best time to call WIB from AST?
There is no shared working-hours window because of the +11h gap. The closest option is 1:00 PM in AST, which is 12:00 AM in WIB.
Which is ahead, AST or WIB?
AST is 11 hours ahead of WIB. When it is 12:00 PM in AST it is 11:00 PM in WIB.
Does daylight saving time affect the AST–WIB difference?
Neither zone observes daylight saving time, so the +11h offset between AST and WIB is fixed all year.
Which other cities share AST's time zone?
AST also covers Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.
Which countries use AST, AST's zone?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, Barbados, Trinidad and Tobago.
Is there a day difference between AST and WIB?
Not normally. The +11h gap only pushes the date over for late-evening times.
What is the time difference between AST and WIB?
WIB is +11h from AST.
What timezone is AST in?
AST operates on its local timezone.
What timezone is WIB in?
WIB operates on its local timezone.
Which countries use AST (Atlantic Standard Time)?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, and 2 more countries.
Does AST observe daylight saving time?
Yes, AST switches to ADT during summer months.
What are some interesting facts about AST?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
Which cities are in the WIB timezone?
Major cities in the WIB timezone include Jakarta, Surabaya, Bandung, Medan, Palembang.
What is the UTC offset for WIB?
Western Indonesia Time (WIB) is at UTC+07:00.
What should I know about the WIB timezone?
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.
When is it midnight in AST, what time is it in WIB?
When it is 12:00 AM (midnight) in AST (AST), it is +11h later in WIB (WIB).
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See every conversion from AST →·See every conversion from WIB →