Question 1

Why is IST offset by half an hour?

Accepted Answer

India's reference meridian is 82.5°E, which yields a solar time of UTC+5:30. The half-hour offset was adopted in 1906 to place the meridian near the centre of undivided India's population.

Question 2

Does IST ever change for daylight saving?

Accepted Answer

No. India has not observed DST since 1945. The offset stays UTC+5:30 every day.

Question 3

Is IST the same as Irish Standard Time or Israel Standard Time?

Accepted Answer

No. All three use "IST," but India Standard Time is UTC+5:30. Irish Standard Time is UTC+1 (summer only). Israel Standard Time is UTC+2 (winter only). Check the offset, not the abbreviation.

Question 4

Which countries share the same time as IST?

Accepted Answer

Sri Lanka uses UTC+5:30 year-round as Sri Lanka Standard Time. The offsets are identical. The legal standards are maintained separately. No other country uses UTC+5:30.

Question 5

What is the best overlap for a call between India and the US East Coast?

Accepted Answer

The best windows: 7:00-9:00 AM US Eastern time (5:30-7:30 PM IST) or 7:00-9:00 PM US Eastern time (5:30-7:30 AM IST the next day). In US summer, the afternoon overlap runs 8:00-10:00 PM Eastern (5:30-7:30 AM IST the next day).

Question 6

Who should use a date-specific converter instead of a static chart?

Accepted Answer

Freelancers scheduling recurring weekly calls across DST boundaries. A static chart works for November, February and June, August. During March, April and October, November, the offset changes by the week. Check the exact date before sending the invite.

Time Zone Converters — Page 2

All 38 converters on timein.ist