Convert AST to MMT
MMT is 10 hours 30 minutes ahead of AST. AST is UTC−4 and MMT is UTC+6:30.
Right now: AST · MMT
Which AST is this?
AST names more than one zone. This page reads it as Atlantic Standard Time at UTC−4, which is the reading most converters take. There is one other: Arabia Standard Time at UTC+3, used in Saudi Arabia, Iraq, Kuwait, Bahrain, Qatar and Yemen.
The letters on a meeting invitation do not say which one is meant. If yours is not Atlantic Standard Time, the answer above is wrong, and not by a little:
| If AST means | Then |
|---|---|
| Atlantic Standard Time — assumed on this page | MMT is 10.5 hours ahead of AST |
| Arabia Standard Time | MMT is 3.5 hours ahead of AST |
The large converter sites disagree about this as well: search for a AST conversion and some of the results answer for one reading and some for another, none of them saying which they chose. Where it matters, ask which country the sender is in rather than which letters they typed.
Best time to schedule a meeting
Standard 9–5 working hours do not overlap at all between AST and MMT. Someone has to take an early or late call — or use asynchronous communication instead.
| AST | MMT | Suitable? |
|---|---|---|
| 9:00 AM | 7:30 PM | outside 9–5 |
| 10:00 AM | 8:30 PM | outside 9–5 |
| 11:00 AM | 9:30 PM | outside 9–5 |
| 12:00 PM | 10:30 PM | outside 9–5 |
| 1:00 PM | 11:30 PM | outside 9–5 |
| 2:00 PM | 12:30 AM (next day) | outside 9–5 |
| 3:00 PM | 1:30 AM (next day) | outside 9–5 |
| 4:00 PM | 2:30 AM (next day) | outside 9–5 |
| 5:00 PM | 3:30 AM (next day) | outside 9–5 |
AST to MMT conversion table
| AST | MMT |
|---|---|
| 12:00 AM | 10:30 AM |
| 1:00 AM | 11:30 AM |
| 2:00 AM | 12:30 PM |
| 3:00 AM | 1:30 PM |
| 4:00 AM | 2:30 PM |
| 5:00 AM | 3:30 PM |
| 6:00 AM | 4:30 PM |
| 7:00 AM | 5:30 PM |
| 8:00 AM | 6:30 PM |
| 9:00 AM | 7:30 PM |
| 10:00 AM | 8:30 PM |
| 11:00 AM | 9:30 PM |
| 12:00 PM | 10:30 PM |
| 1:00 PM | 11:30 PM |
| 2:00 PM | 12:30 AM (next day) |
| 3:00 PM | 1:30 AM (next day) |
| 4:00 PM | 2:30 AM (next day) |
| 5:00 PM | 3:30 AM (next day) |
| 6:00 PM | 4:30 AM (next day) |
| 7:00 PM | 5:30 AM (next day) |
| 8:00 PM | 6:30 AM (next day) |
| 9:00 PM | 7:30 AM (next day) |
| 10:00 PM | 8:30 AM (next day) |
| 11:00 PM | 9:30 AM (next day) |
About AST
Atlantic Standard Time (AST) is UTC−4. It is used in Halifax, Puerto Rico and the eastern Caribbean in winter.
Atlantic Standard Time is UTC−4, one hour ahead of Eastern. It covers Canada's Atlantic provinces, Puerto Rico and much of the eastern Caribbean, and it is the reason a call from Halifax to Toronto is an hour out from what either party expects. The abbreviation is also used for Arabia Standard Time at UTC+3, seven hours away in the other direction, which is a genuinely dangerous collision in scheduling.
About MMT
Myanmar Time (MMT) is UTC+6:30. It is used in Myanmar, all year.
Myanmar Time is UTC+6:30, another of the half-hour zones and one of only a handful in Asia. It has no daylight saving. The same offset is used by the Cocos Islands, which is the only other place on it, so a UTC+6:30 timestamp is almost always Myanmar.
Does this gap change with the seasons?
Neither AST nor MMT shifts with the seasons, so this 10.5-hour difference holds all year. That is unusual enough to be worth relying on: most cross-continental gaps move twice a year.
This is the reason scheduling systems store an IANA zone such as Region/City rather than an offset or an abbreviation: the zone knows its own rules and the offset does not.
Frequently asked questions
What time is 9:00 AM AST in MMT?
9:00 AM AST is 7:30 PM MMT.
Is MMT ahead of AST?
MMT is 10 hours 30 minutes ahead of AST.
Which time zone does this use?
AST is UTC−4 and MMT is UTC+6:30. Both abbreviations denote a single fixed offset, so this conversion never shifts with daylight saving — what changes is which abbreviation a place is using at the time.