--:--:--
—
Mumbai · Delhi · Bengaluru
Find the best shared slot in the world time clock meeting planner.
Difference
AST vs IST
UTC → UTC
--:--:--
—
San Juan · Barbados · Halifax (winter)
IST to AST converter
Convert IST to AST time now
Free IST to AST converter. See India Standard Time and Atlantic Standard Time side by side. Live clocks, a 9h 30m gap, meeting hours, and a full-day chart for Mumbai and San Juan.
Asia/Kolkata
—
IST → AST
To · Atlantic Standard Time
—
America/Puerto_Rico
Interactive diagram
Watch IST convert into AST
Drag the India hour. Watch the Atlantic clock change.
India
9:00 AM IST
—
AST ← IST
Atlantic
—
Full-day chart
IST to AST hourly conversion chart
Full-day table. Tap a row to copy. Labels follow daylight saving.
| India | Atlantic | UTC offsets |
|---|
Meeting times
Best IST to AST meeting window
Find hours that work on both sides. Then save the slot to your calendar.
Follow along
Step-by-step IST to AST conversion
Four short steps to convert any IST time to AST.
Choose IST time
Select any hour in India Standard Time. Smart mode uses Asia/Kolkata.
IST to AST conversion guide
IST to AST conversion guide
This IST to AST converter shows Atlantic Standard Time (UTC−4) for any India Standard Time (UTC+5:30) time. Use it to schedule between Mumbai and San Juan. Choose Smart DST for live city clocks. Choose Fixed mode when you only want the IST and AST labels.
India
IST
UTC+5:30
Mumbai · Delhi · Bengaluru
IST vs AST—
Atlantic
AST
UTC−4
San Juan · Barbados · Halifax (winter)
What is IST to AST conversion?
IST to AST conversion turns a IST clock into the matching AST time. Use it for calls, travel, and teams in Mumbai and San Juan.
IST to AST time difference
AST is 9h 30m behind IST. Subtract 9h 30m from the IST time to get AST. The live clocks at the top show the current IST to AST gap.
IST vs AST
IST is UTC+5:30. AST is UTC−4. They are different names. If a region uses daylight saving, check the live labels.
IST to AST now / current time
Need ist to ast right now? Read the live clocks, or tap Use current time for an instant IST → AST result.
IST to AST time difference
Season / context — tap to explore
See how daylight saving can change this pair.
India—
—IST → AST
Atlantic—
Quick answers
India
India Standard Time (IST)
UTC+5:30
India Standard Time (IST) is UTC+5:30. Smart DST uses the city clock Asia/Kolkata so daylight saving stays correct for Mumbai · Delhi · Bengaluru.
- Cities: Mumbai · Delhi · Bengaluru
- City clock: Asia/Kolkata
- Fixed IST: UTC+5:30
- On this page it pairs with AST (UTC−4)
Atlantic
Atlantic Standard Time (AST)
UTC−4
Atlantic Standard Time (AST) is UTC−4. Smart DST uses America/Puerto_Rico for cities such as San Juan · Barbados · Halifax (winter).
- Cities: San Juan · Barbados · Halifax (winter)
- City clock: America/Puerto_Rico
- Fixed AST: UTC−4
- From IST: AST is 9h 30m behind IST
IST to AST FAQ