AST to PDT Converter & Meeting Planner
Quick answer: 9:00 AM AST = 6:00 AM PDT (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 Pacific Daylight Time (PDT)? You need to account for the standard time difference. Pacific Daylight Time is normally 3 hours behind Atlantic Standard Time. Whether you are coordinating between teams in Halifax and San Juan and Los Angeles and San Francisco, 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 = 9:00 PM PDT. The full 24-hour AST to PDT table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM AST = 12:00 PM PDT.
| AST Time | PDT Time |
|---|---|
| 12:00 AM (00:00) | 9:00 PM (21:00)-1 day |
| 1:00 AM (01:00) | 10:00 PM (22:00)-1 day |
| 2:00 AM (02:00) | 11:00 PM (23:00)-1 day |
| 3:00 AM (03:00) | 12:00 AM (00:00) |
| 4:00 AM (04:00) | 1:00 AM (01:00) |
| 5:00 AM (05:00) | 2:00 AM (02:00) |
| 6:00 AM (06:00) | 3:00 AM (03:00) |
| 7:00 AM (07:00) | 4:00 AM (04:00) |
| 8:00 AM (08:00) | 5:00 AM (05:00) |
| 9:00 AM (09:00) | 6:00 AM (06:00) |
| 10:00 AM (10:00) | 7:00 AM (07:00) |
| 11:00 AM (11:00) | 8:00 AM (08:00) |
| 12:00 PM (12:00) | 9:00 AM (09:00) |
| 1:00 PM (13:00) | 10:00 AM (10:00) |
| 2:00 PM (14:00) | 11:00 AM (11:00) |
| 3:00 PM (15:00) | 12:00 PM (12:00) |
| 4:00 PM (16:00) | 1:00 PM (13:00) |
| 5:00 PM (17:00) | 2:00 PM (14:00) |
| 6:00 PM (18:00) | 3:00 PM (15:00) |
| 7:00 PM (19:00) | 4:00 PM (16:00) |
| 8:00 PM (20:00) | 5:00 PM (17:00) |
| 9:00 PM (21:00) | 6:00 PM (18:00) |
| 10:00 PM (22:00) | 7:00 PM (19:00) |
| 11:00 PM (23:00) | 8:00 PM (20:00) |
Best time to call Los Angeles from Halifax
For most work calls, compare the normal business day in Halifax (AST) with the business day in Los Angeles (PDT). AST commonly covers North America, Caribbean, while PDT is mainly associated with North America.
⚠️ 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.
✅ The most practical overlap on 2026-07-05 is usually 1:00 PM - 5:00 PM AST, which corresponds to 9:00 AM - 1:00 PM PDT. This window sits inside the typical AST workday (9:00 AM - 5:00 PM) and the PDT workday (9:00 AM - 6:00 PM).
- DST Safety: AST or PDT may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
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Frequently Asked Questions
What is the time difference between AST and PDT?
During standard time, Pacific Daylight Time is 3 hours behind 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.
When does PDT start and end?
PDT begins on the second Sunday in March at 02:00 local time, when clocks spring forward one hour from PST (UTC-8) to PDT (UTC-7). It ends on the first Sunday in November at 02:00 local time, when clocks fall back to PST. In 2026, PDT runs from March 8 through November 1 — covering the majority of the calendar year.
Is PDT the same as PST?
PDT and PST are two phases of the same Pacific Time zone, not two separate zones. PST (Pacific Standard Time) is the winter offset at UTC-8, observed from early November through mid-March. PDT (Pacific Daylight Time) is the summer offset at UTC-7, active during Daylight Saving Time — meaning Los Angeles, Seattle, and Vancouver run one hour ahead of their winter clock for approximately eight months of every year.