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USA & Canada DST — How EST/EDT Changes the IST Time Gap
The United States and Canada observe Daylight Saving Time (DST), switching clocks forward by 1 hour in spring and back in autumn. Because India's IST (UTC+5:30) never changes, this shift is entirely on the American side — shrinking or growing the IST time gap by 1 full hour.
Standard time
EST (UTC−5)
Eastern Standard Time
⟷
DST / Summer time
EDT (UTC−4)
Eastern Daylight Time
IST gap (standard)
10h 30m behind IST
→
IST gap (DST)
9h 30m behind IST
Clock Change Schedule
Clocks spring forward 1 hour on the **2nd Sunday of March** at 2 AM, switching EST→EDT. They fall back on the **1st Sunday of November** at 2 AM, switching EDT→EST. DST is in effect for roughly 8 months of the year (mid-March to early November).
2025
| Spring forward (EST to EDT) | 9 March 2025 |
| Fall back (EDT to EST) | 2 November 2025 |
2026
| Spring forward (EST to EDT) | 8 March 2026 |
| Fall back (EDT to EST) | 1 November 2026 |
USA & Canada Cities — IST Time Difference
How the IST gap changes for each USA & Canada city between standard and DST
| City | Time Zone | IST gap (EST / standard) | IST gap (EDT / summer) |
|---|---|---|---|
| New York | EST/EDT | 10h 30m behind | 9h 30m behind |
| Boston | EST/EDT | 10h 30m behind | 9h 30m behind |
| Chicago | CST/CDT (UTC−6/−5) | 11h 30m behind | 10h 30m behind |
| Toronto | EST/EDT | 10h 30m behind | 9h 30m behind |
| Los Angeles | PST/PDT (UTC−8/−7) | 13h 30m behind | 12h 30m behind |
| Vancouver | PST/PDT (UTC−8/−7) | 13h 30m behind | 12h 30m behind |
IST to EST/EDT Quick Reference
Both standard (EST) and summer (EDT) conversions at a glance
| IST (India) | EST (standard, winter) | EDT (summer) |
|---|---|---|
| 9:00 AM | 10:30 PM (prev day) | 11:30 PM (prev day) |
| 12:00 PM | 1:30 AM | 2:30 AM |
| 3:00 PM | 4:30 AM | 5:30 AM |
| 6:00 PM | 7:30 AM | 8:30 AM |
| 9:00 PM | 10:30 AM | 11:30 AM |
| 11:00 PM | 12:30 PM | 1:30 PM |
Current USA & Canada Time vs IST
India (IST)
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USA & Canada (EST/EDT)
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Frequently Asked Questions
What is the IST to EST time difference?
IST (UTC+5:30) is 10 hours 30 minutes ahead of EST (UTC−5). When it is 12:00 PM IST, it is 1:30 AM EST in New York. This standard-time offset applies from early November to early March.
What is the IST to EDT time difference?
IST is 9 hours 30 minutes ahead of EDT (UTC−4). When it is 12:00 PM IST, it is 2:30 AM EDT in New York. EDT applies from the 2nd Sunday of March to the 1st Sunday of November — roughly 8 months of the year.
When did the US change clocks in 2025?
US clocks sprang forward at 2 AM on 9 March 2025 (EST→EDT). They will fall back at 2 AM on 2 November 2025 (EDT→EST). If you scheduled a regular call with a New York colleague for 9 PM IST (= 8:30 AM EDT), that same clock time in New York after November 2 becomes 7:30 AM EST — worth adjusting.
Does Arizona observe DST?
No. The state of Arizona does not observe DST (except for the Navajo Nation within Arizona). Arizona uses MST (UTC−7) year-round, which is 12h 30m behind IST — always, regardless of the March/November clock changes.
How do I handle standing calls with US teams around the DST switch?
The safest approach is to express meeting times in IST on your side and confirm the absolute UTC time. For example: "Let's speak at 2 PM IST (08:30 UTC)." The US team translates that to their current local time. Alternatively, most calendar apps (Google Calendar, Outlook) display the correct local time in each party's zone when you share an event as a recurring meeting.
Does Canada observe DST at the same time as the USA?
Most of Canada synchronises with US DST dates — clocks spring forward on the 2nd Sunday of March and fall back on the 1st Sunday of November. Quebec, Ontario, and British Columbia follow this schedule. Saskatchewan does not observe DST and stays on CST (UTC−6) year-round.