AST TokyoTime Converter
AST (UTC−4) is currently 13 hours behind Tokyo (JST, UTC+9). Compare live clocks, convert any hour, and find times to meet.
Quick answer
When it's in AST, it's the same day in Tokyo.
AST runs 13 hours behind Tokyo (JST). A 9-to-5 workday on one side lands in the other side's evening or night, so the two cities share almost no normal working hours — edge-of-day calls are the trick.
- Time difference
- +13h 00m
- AST
- UTC−4
- Tokyo
- UTC+9
- Best call window
- Outside 9–6
AST to Tokyo conversion table
The next 12 hours in AST and the matching local time in Tokyo. The current hour is highlighted; drag the converter's slider and the table follows.
| AST | Tokyo · JST |
|---|---|
| NOW Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Best time to meet between AST & Tokyo
Working hours are 9am–6pm in each city. The bright band is where they overlap — when both sides are at their desks.
Daylight saving shifts this gap by up to 1 hour
The difference between AST and Tokyo swings between 12 and 13 hours across the year as each side starts or ends daylight saving. Regions on AST switch to ADT (UTC−3) during daylight saving time. Tokyo does not observe daylight saving time. This page always shows the live, DST-aware difference.
Related time zone conversions
Jump straight to another pair — every combination is a live tool, not an article.
From AST
To Tokyo
One source of truth — for you and your AI
This page exposes the same answer as structured data, so when you ask an assistant "what's 9am AST time in Tokyo?", it can cite the exact, DST-aware result — not a stale blog post.
- Schema.org JSON-LD on every converter page
- A machine-readable facts island with IANA zones and every possible offset
- Live times in <time datetime> elements with explicit UTC offsets
{
"pair": "AST → Tokyo",
"url": "https://worldclock.pro/en/convert/ast-to-tokyo",
"from": {
"name": "AST",
"type": "timezone",
"abbreviation": "AST",
"daylightAbbreviation": "ADT",
"iana": "America/Halifax",
"standardUtcOffset": "-04:00",
"daylightUtcOffset": "-03:00",
"referenceCity": "Halifax"
},
"to": {
"name": "Tokyo",
"type": "city",
"abbreviation": "JST",
"daylightAbbreviation": null,
"iana": "Asia/Tokyo",
"standardUtcOffset": "+09:00",
"daylightUtcOffset": null,
"referenceCity": "Tokyo"
},
"currentDifferenceMinutes": 780,
"possibleDifferencesMinutes": [
720,
780
],
"note": "Between the regions that use these zones the difference is 12 and 13 hours across the year, depending on daylight saving on each side. The clocks on this page show the named zones themselves, which are fixed."
}
Frequently asked questions
What is the time difference between AST and Tokyo?
AST is currently 13 hours behind Tokyo. AST is on AST (UTC−4) and Tokyo is on JST (UTC+9). The difference can change when either side starts or ends daylight saving time.
Is Tokyo ahead of or behind AST?
Tokyo is currently 13 hours ahead of AST.
When it is 9:00 AM in AST, what time is it in Tokyo?
When it is 9:00 AM on a Monday in AST, it is 10:00 PM in Tokyo.
Do AST and Tokyo observe daylight saving time?
Regions on AST switch to ADT (UTC−3) during daylight saving time. Tokyo does not observe daylight saving time.
How do I convert AST time to Tokyo time?
Add 13 hours to any time in AST to get the time in Tokyo. This page's converter and 24-hour table do it automatically and stay correct through daylight-saving changes.
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