ADT to JST Converter
Trying to line up ADT and JST? JST is 12 hours ahead of ADT. Set any ADT time below to see the matching JST time and date.
Daylight saving notes
In the United States and Canada, daylight saving time runs from the second Sunday in March to the first Sunday in November. That affects Atlantic Daylight Time (ADT).
ADT to JST conversion chart
For example, a 9:00 AM ADT meeting takes place at 9:00 PM JST. Concretely, when Halifax (ADT) and Tokyo (JST) set up a call, jST is 12 hours ahead of ADT.
| ADT time | JST time |
|---|---|
| 12:00 AM | 12:00 PM |
| 1:00 AM | 1:00 PM |
| 2:00 AM | 2:00 PM |
| 3:00 AM | 3:00 PM |
| 4:00 AM | 4:00 PM |
| 5:00 AM | 5:00 PM |
| 6:00 AM | 6:00 PM |
| 7:00 AM | 7:00 PM |
| 8:00 AM | 8:00 PM |
| 9:00 AM | 9:00 PM |
| 10:00 AM | 10:00 PM |
| 11:00 AM | 11:00 PM |
| 12:00 PM | 12:00 AM+1 day |
| 1:00 PM | 1:00 AM+1 day |
| 2:00 PM | 2:00 AM+1 day |
| 3:00 PM | 3:00 AM+1 day |
| 4:00 PM | 4:00 AM+1 day |
| 5:00 PM | 5:00 AM+1 day |
| 6:00 PM | 6:00 AM+1 day |
| 7:00 PM | 7:00 AM+1 day |
| 8:00 PM | 8:00 AM+1 day |
| 9:00 PM | 9:00 AM+1 day |
| 10:00 PM | 10:00 AM+1 day |
| 11:00 PM | 11:00 AM+1 day |
This chart uses the fixed ADT and JST offsets; the live converter above follows current daylight saving.
Convert ADT to JST Time Zone
Below are the answers people search for most when converting Atlantic Daylight Time (ADT) to Japan Standard Time (JST).
Converting ADT to JST, step by step
It takes three quick steps:
- Click the ADT field on the left and pick the time you want to convert.
- The matching JST time updates on the right automatically — there’s no button to press.
- Need a different day? Click the date field and the result follows, rolling over if it crosses midnight.
How many hours apart are ADT and JST?
JST is 12 hours ahead of ADT. In everyday terms, once you know the time on one side you just add 12 hours to get the other — so a call between Halifax and Tokyo is always 12 hours apart.
What's the current time in JST?
Right now the time in Japan Standard Time (JST) is Tuesday, June 30, 2026 · 2:53:57 AM. It ticks every second, so you’re always looking at the live JST clock.
And what time is it in ADT?
And in Atlantic Daylight Time (ADT), it’s currently Monday, June 29, 2026 · 2:53:57 PM. Compare the two and the 12 hours gap is easy to see.
When is a good time to schedule a ADT to JST meeting?
For example, a 9:00 AM ADT meeting takes place at 9:00 PM JST. The trick is to aim for a slot that lands inside normal working hours on both sides. Once you’ve found a time, hit Share on the converter to copy a link with the time built in — easy to send to a colleague. Juggling three or more zones? The meeting planner highlights the hours that overlap for everyone.
Does daylight saving time change the ADT–JST difference?
The labels ADT and JST are fixed offsets, so the result on this page is always exact. One side switches between standard and summer time while the other stays put, so the real-world gap can shift by an hour for part of the year. It's worth checking which label a region is actually using before you lock in a time.
How accurate is this ADT to JST conversion?
We don’t guess. ADT and JST times are worked out from the official IANA time zone database, the trusted standard that operating systems use worldwide. Because daylight-saving rules and regional offsets do change over time, we track those updates rather than relying on a fixed number — which is exactly where many converters slip up.
Convert ADT to other time zones
- UTC Coordinated Universal Time
- GMT Greenwich Mean Time
- EST Eastern Standard Time
- EDT Eastern Daylight Time
- CST Central Standard Time
- CDT Central Daylight Time
- MST Mountain Standard Time
- MDT Mountain Daylight Time
- PST Pacific Standard Time
- PDT Pacific Daylight Time
- AKST Alaska Standard Time
- AKDT Alaska Daylight Time
- HST Hawaii Standard Time
- AST Atlantic Standard Time
- NST Newfoundland Standard Time
- NDT Newfoundland Daylight Time
- BRT Brasília Time
- ART Argentina Time
- WET Western European Time
- WEST Western European Summer Time
- CET Central European Time
- CEST Central European Summer Time
- EET Eastern European Time
- EEST Eastern European Summer Time
- BST British Summer Time
- IST Irish Standard Time
- MSK Moscow Standard Time
- TRT Turkey Time
- WAT West Africa Time
- CAT Central Africa Time
- EAT East Africa Time
- SAST South Africa Standard Time
- GST Gulf Standard Time
- IST Israel Standard Time
- IDT Israel Daylight Time
- IST India Standard Time
- PKT Pakistan Standard Time
- BDT Bangladesh Standard Time
- ICT Indochina Time
- WIB Western Indonesian Time
- WITA Central Indonesian Time
- WIT Eastern Indonesian Time
- CST China Standard Time
- HKT Hong Kong Time
- SGT Singapore Time
- PHT Philippine Time
- JST Japan Standard Time
- KST Korea Standard Time
- AWST Australian Western Standard Time
- ACST Australian Central Standard Time
- ACDT Australian Central Daylight Time
- AEST Australian Eastern Standard Time
- AEDT Australian Eastern Daylight Time
- NZST New Zealand Standard Time
- NZDT New Zealand Daylight Time
Convert to JST from other time zones
- UTC Coordinated Universal Time
- GMT Greenwich Mean Time
- EST Eastern Standard Time
- EDT Eastern Daylight Time
- CST Central Standard Time
- CDT Central Daylight Time
- MST Mountain Standard Time
- MDT Mountain Daylight Time
- PST Pacific Standard Time
- PDT Pacific Daylight Time
- AKST Alaska Standard Time
- AKDT Alaska Daylight Time
- HST Hawaii Standard Time
- AST Atlantic Standard Time
- ADT Atlantic Daylight Time
- NST Newfoundland Standard Time
- NDT Newfoundland Daylight Time
- BRT Brasília Time
- ART Argentina Time
- WET Western European Time
- WEST Western European Summer Time
- CET Central European Time
- CEST Central European Summer Time
- EET Eastern European Time
- EEST Eastern European Summer Time
- BST British Summer Time
- IST Irish Standard Time
- MSK Moscow Standard Time
- TRT Turkey Time
- WAT West Africa Time
- CAT Central Africa Time
- EAT East Africa Time
- SAST South Africa Standard Time
- GST Gulf Standard Time
- IST Israel Standard Time
- IDT Israel Daylight Time
- IST India Standard Time
- PKT Pakistan Standard Time
- BDT Bangladesh Standard Time
- ICT Indochina Time
- WIB Western Indonesian Time
- WITA Central Indonesian Time
- WIT Eastern Indonesian Time
- CST China Standard Time
- HKT Hong Kong Time
- SGT Singapore Time
- PHT Philippine Time
- KST Korea Standard Time
- AWST Australian Western Standard Time
- ACST Australian Central Standard Time
- ACDT Australian Central Daylight Time
- AEST Australian Eastern Standard Time
- AEDT Australian Eastern Daylight Time
- NZST New Zealand Standard Time
- NZDT New Zealand Daylight Time
Frequently asked questions
How many hours ahead of ADT is JST?
JST is 12 hours ahead of ADT — a fixed 12 hours difference, since both are fixed-offset labels.
What time is it in JST when it's 12:00 PM ADT?
When it's 12:00 PM (noon) ADT, it's 12:00 AM JST the next day.
Do ADT or JST use daylight saving time?
Atlantic Daylight Time (ADT) observes daylight saving, alternating with AST; Japan Standard Time (JST) is a fixed offset with no daylight saving.
Why might the real-world ADT–JST difference change during the year?
The labels ADT and JST are fixed offsets, so this converter is always exact. But Atlantic Daylight Time's region switches between standard and summer time, so for part of the year you may actually want AST to JST. Always check which label a region is currently using before you schedule.