IST to EST Converter

India Standard Time → Eastern Standard Time · IST is 10.5 hours ahead of EST

IST
—
EST
—

IST and EST are the same time

IST to EST Conversion Table

ISTEST
12:00 AM12:00 AM
1:00 AM1:00 AM
2:00 AM2:00 AM
3:00 AM3:00 AM
4:00 AM4:00 AM
5:00 AM5:00 AM
6:00 AM6:00 AM
7:00 AM7:00 AM
8:00 AM8:00 AM
9:00 AM9:00 AM
10:00 AM10:00 AM
11:00 AM11:00 AM
12:00 PM12:00 PM
1:00 PM1:00 PM
2:00 PM2:00 PM
3:00 PM3:00 PM
4:00 PM4:00 PM
5:00 PM5:00 PM
6:00 PM6:00 PM
7:00 PM7:00 PM
8:00 PM8:00 PM
9:00 PM9:00 PM
10:00 PM10:00 PM
11:00 PM11:00 PM

Green rows = business hours overlap (9:00 AM – 6:00 PM IST)

Major IST Cities
  • Mumbai
  • Delhi
  • Bangalore
  • Hyderabad
  • Chennai
  • Kolkata
Major EST Cities
  • New York, NY
  • Miami, FL
  • Boston, MA
  • Atlanta, GA
  • Washington D.C.
  • Toronto, Canada
Time Converter
Convert any two cities
Meeting Planner
Find the best overlap time
World Clock
Current time in 400+ cities

IST vs EST — What You Need to Know

India Standard Time (IST) is UTC+5:30 — a half-hour offset that applies uniformly across all of India. India does not observe DST. IST is used in Mumbai, Delhi, Bangalore, and every other Indian city.

Eastern Standard Time (EST) is UTC-5 (EDT: UTC-4 in summer).

With a 10.5-hour gap, India and the US East Coast have minimal business-hours overlap. The standard strategy for India-US teams is the "end of India day / start of US day" window: 6:30–8:00 PM IST = 8:00–9:30 AM EST.

Note on DST shift:

The gap changes when the US observes DST (March–November): 10.5h → 9.5h. India stays at UTC+5:30 year-round, so the overlap window shifts by 1 hour during US summer.

Frequently Asked Questions

How many hours ahead is IST compared to EST?

IST (India Standard Time, UTC+5:30) is 10.5 hours ahead of EST (UTC-5) during US standard time, and 9.5 hours ahead during EDT (UTC-4). India does not observe Daylight Saving Time, so the difference shifts by 1 hour when the US switches between standard and daylight time.

When it is 9:00 AM IST, what time is it EST?

When it is 9:00 AM IST, it is 10:30 PM EST the previous day (during US standard time) or 11:30 PM EDT (during US daylight time). India business hours largely do not overlap with US East Coast business hours.

What is the best time for a call between India (IST) and New York (EST)?

The only practical overlap window is 6:30 PM to 8:30 PM IST (8:00 AM to 10:00 AM EST during standard time). This requires Indian participants to stay late. Alternatively, early IST morning calls (7:30–8:30 AM IST) correspond to late US evening (9–10 PM EST the previous night), which rarely works for business.

Does IST observe Daylight Saving Time?

No. India does not observe Daylight Saving Time. IST remains at UTC+5:30 year-round. This means the IST-to-EST time difference changes twice per year: it is 10.5 hours during US standard time (November–March) and 9.5 hours during US daylight time (March–November).

Why does India have a 30-minute UTC offset?

India uses UTC+5:30 (a half-hour offset) to better reflect the geographic center of the country. When India standardized its timezone in 1947, a compromise was made between the eastern regions (closer to UTC+6) and western regions (closer to UTC+5). This makes IST unique among major economies for its non-whole-hour offset.