AST to WIB Converter & Meeting Planner
Quick answer: 9:00 AM AST = 8:00 PM WIB (fixed -04:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Atlantic Standard Time (AST) and Western Indonesian Time (WIB)? You need to account for the standard time difference. Western Indonesian Time is normally 11 hours ahead of Atlantic Standard Time. Whether you are coordinating between teams in Halifax and San Juan and Jakarta and Surabaya, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM AST = 11:00 AM WIB. The full 24-hour AST to WIB table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM AST = 2:00 AM WIB (+1 day).
| AST Time | WIB Time |
|---|---|
| 12:00 AM (00:00) | 11:00 AM (11:00) |
| 1:00 AM (01:00) | 12:00 PM (12:00) |
| 2:00 AM (02:00) | 1:00 PM (13:00) |
| 3:00 AM (03:00) | 2:00 PM (14:00) |
| 4:00 AM (04:00) | 3:00 PM (15:00) |
| 5:00 AM (05:00) | 4:00 PM (16:00) |
| 6:00 AM (06:00) | 5:00 PM (17:00) |
| 7:00 AM (07:00) | 6:00 PM (18:00) |
| 8:00 AM (08:00) | 7:00 PM (19:00) |
| 9:00 AM (09:00) | 8:00 PM (20:00) |
| 10:00 AM (10:00) | 9:00 PM (21:00) |
| 11:00 AM (11:00) | 10:00 PM (22:00) |
| 12:00 PM (12:00) | 11:00 PM (23:00) |
| 1:00 PM (13:00) | 12:00 AM (00:00)+1 day |
| 2:00 PM (14:00) | 1:00 AM (01:00)+1 day |
| 3:00 PM (15:00) | 2:00 AM (02:00)+1 day |
| 4:00 PM (16:00) | 3:00 AM (03:00)+1 day |
| 5:00 PM (17:00) | 4:00 AM (04:00)+1 day |
| 6:00 PM (18:00) | 5:00 AM (05:00)+1 day |
| 7:00 PM (19:00) | 6:00 AM (06:00)+1 day |
| 8:00 PM (20:00) | 7:00 AM (07:00)+1 day |
| 9:00 PM (21:00) | 8:00 AM (08:00)+1 day |
| 10:00 PM (22:00) | 9:00 AM (09:00)+1 day |
| 11:00 PM (23:00) | 10:00 AM (10:00)+1 day |
Best time to call Jakarta from Halifax
For most work calls, compare the normal business day in Halifax (AST) with the business day in Jakarta (WIB). AST commonly covers North America, Caribbean, while WIB is mainly associated with Southeast Asia.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
⚠️ There is no clean same-day business-hours overlap on 2026-07-05. A practical compromise is around 11:00 PM AST, which reaches 9:00 AM WIB near the start of their workday.
- DST Safety: AST or WIB may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- Indonesia Stock Exchange (IDX): 09:00-16:00 local time in Jakarta.
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Frequently Asked Questions
What is the time difference between AST and WIB?
During standard time, Western Indonesian Time is 11 hours ahead of Atlantic Standard Time.
Does the Caribbean observe Daylight Saving Time?
The vast majority of Caribbean nations and territories — including Puerto Rico, the Dominican Republic, the US Virgin Islands, Trinidad and Tobago, and Barbados — do not observe Daylight Saving Time and remain on AST (UTC-4) year-round. This means these territories share the same clock as Halifax only during the Atlantic Standard Time window in winter, diverging by one hour once Canada and Bermuda advance to ADT each spring.
What is the difference between AST and ADT?
AST (Atlantic Standard Time) is the standard winter offset at UTC-4:00, observed from the first Sunday in November through the second Sunday in March across all AST regions. ADT (Atlantic Daylight Time) is the summer offset at UTC-3:00, applied by Eastern Canadian provinces and Bermuda when they advance their clocks by one hour during Daylight Saving Time.
Does Indonesia observe Daylight Saving Time?
Indonesia does not observe Daylight Saving Time and has not done so since 1963. WIB remains fixed at UTC+07:00 year-round, providing consistent, predictable scheduling for businesses and travelers operating across Indonesian time zones.
Which areas of Indonesia use WIB?
WIB applies to Indonesia's westernmost islands: Sumatra, Java, West Kalimantan, and Central Kalimantan. These regions encompass the country's largest population centers and its political and economic capital, Jakarta.