IST to AST Converter
AST is 5 hours behind IST. This converter turns any Irish Standard Time (IST) time into Atlantic Standard Time (AST) — just click the time or date to change it.
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 Standard Time (AST).
IST to AST conversion chart
For example, a 9:00 AM IST meeting takes place at 4:00 AM AST. Concretely, when Dublin (IST) and Halifax (AST) set up a call, aST is 5 hours behind IST.
| IST time | AST time |
|---|---|
| 12:00 AM | 7:00 PM−1 day |
| 1:00 AM | 8:00 PM−1 day |
| 2:00 AM | 9:00 PM−1 day |
| 3:00 AM | 10:00 PM−1 day |
| 4:00 AM | 11:00 PM−1 day |
| 5:00 AM | 12:00 AM |
| 6:00 AM | 1:00 AM |
| 7:00 AM | 2:00 AM |
| 8:00 AM | 3:00 AM |
| 9:00 AM | 4:00 AM |
| 10:00 AM | 5:00 AM |
| 11:00 AM | 6:00 AM |
| 12:00 PM | 7:00 AM |
| 1:00 PM | 8:00 AM |
| 2:00 PM | 9:00 AM |
| 3:00 PM | 10:00 AM |
| 4:00 PM | 11:00 AM |
| 5:00 PM | 12:00 PM |
| 6:00 PM | 1:00 PM |
| 7:00 PM | 2:00 PM |
| 8:00 PM | 3:00 PM |
| 9:00 PM | 4:00 PM |
| 10:00 PM | 5:00 PM |
| 11:00 PM | 6:00 PM |
This chart uses the fixed IST and AST offsets; the live converter above follows current daylight saving.
Convert IST to AST Time Zone
A quick guide to IST → AST: the time gap, the live clocks, scheduling tips, and how we keep it accurate.
How does the IST to AST converter work?
It takes three quick steps:
- Click the IST field on the left and pick the time you want to convert.
- The matching AST 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.
IST vs AST: what's the time gap?
AST is 5 hours behind IST. In everyday terms, once you know the time on one side you just subtract 5 hours to get the other — so a call between Dublin and Halifax is always 5 hours apart.
What time is it in AST right now?
Right now the time in Atlantic Standard Time (AST) is Monday, June 29, 2026 · 1:53:59 PM. It ticks every second, so you’re always looking at the live AST clock.
What time is it in IST right now?
And in Irish Standard Time (IST), it’s currently Monday, June 29, 2026 · 6:53:59 PM. Compare the two and the 5 hours gap is easy to see.
When is a good time to schedule a IST to AST meeting?
For example, a 9:00 AM IST meeting takes place at 4:00 AM AST. 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.
How does daylight saving affect IST to AST?
The labels IST and AST are fixed offsets, so the result on this page is always exact. Both regions move their clocks for daylight saving on roughly the same weekends, so the 5 hours gap usually holds steady right through the year.
Why can you trust this IST to AST converter?
Every conversion here is calculated from the IANA time zone database — the same source your phone, computer, and browser rely on. Plenty of tools hard-code a single offset, which quietly goes wrong whenever a region changes its rules or flips for daylight saving. We follow the real rules instead, so IST to AST stays accurate for today and for any past or future date you type in.
Convert IST 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
- 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
- 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 AST 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
- 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
- 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
Frequently asked questions
How many hours behind IST is AST?
AST is 5 hours behind IST — a fixed 5 hours difference, since both are fixed-offset labels.
What time is it in AST when it's 12:00 PM IST?
When it's 12:00 PM (noon) IST, it's 7:00 AM AST.
Do IST or AST use daylight saving time?
Irish Standard Time (IST) observes daylight saving, alternating with GMT; Atlantic Standard Time (AST) observes daylight saving, alternating with ADT.
Why might the real-world IST–AST difference change during the year?
The labels IST and AST are fixed offsets, so this converter is always exact. But Irish Standard Time's region switches between standard and summer time, so for part of the year you may actually want GMT to AST. Always check which label a region is currently using before you schedule.