Convert IST to AST
Convert a time in IST to AST, with daylight-saving changes applied for the date you choose.
IST to AST
Time in IST, Asia
Time in AST, North America
- IST now
- —
- AST now
- —
Time zone details
IST, Asia
- IANA zone
- Asia/Kolkata
- Standard offset
- UTC+05:30
- Daylight saving
- Not observed
AST, North America
- IANA zone
- Etc/GMT+4
- Standard offset
- UTC-04:00
- Daylight saving
- Not observed
Sunrise and sunset are calculated for the city centre and are accurate to about a minute. Local elevation and atmospheric conditions shift the observed horizon.
Need the reverse direction? Convert AST to IST.
Related time zones conversions
Frequently asked questions
What is the time difference between IST and AST?+
IST is UTC+05:30 and AST is UTC-04:00 in standard time. The gap between them changes during the year if either place observes daylight saving, so enter a date to see the difference on that day.
Does IST observe daylight saving time?+
No. IST stays on UTC+05:30 all year.
Does AST observe daylight saving time?+
No. AST stays on UTC-04:00 all year.
Why does one local time sometimes have two answers?+
When clocks go back, the hour before the change repeats, so that local reading happens twice and both instants are valid. When clocks go forward, the skipped hour never occurs, so that reading has no matching instant at all. The converter reports both cases rather than guessing.