IST to SGT Time Converter
SGT is 2 hours and 30 minutes ahead of IST. IST is UTC+5:30, and SGT is UTC+8:00.
Best Time to Call Between IST and SGT
Both zones are inside normal business hours between 9:00 AM and 3:00 PM IST — that's 11:30 AM to 5:30 PM SGT. That's a 6-hour window.
both at work IST only SGT only neither — hours along the strip are IST.
Common Times Converted
IST on the left, SGT on the right.
IST to SGT: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| IST | SGT | Working hours |
|---|---|---|
| 12:00 AM | 2:30 AM | — |
| 1:00 AM | 3:30 AM | — |
| 2:00 AM | 4:30 AM | — |
| 3:00 AM | 5:30 AM | — |
| 4:00 AM | 6:30 AM | — |
| 5:00 AM | 7:30 AM | — |
| 6:00 AM | 8:30 AM | — |
| 7:00 AM | 9:30 AM | SGT only |
| 8:00 AM | 10:30 AM | SGT only |
| 9:00 AM | 11:30 AM | Both zones |
| 10:00 AM | 12:30 PM | Both zones |
| 11:00 AM | 1:30 PM | Both zones |
| 12:00 PM | 2:30 PM | Both zones |
| 1:00 PM | 3:30 PM | Both zones |
| 2:00 PM | 4:30 PM | Both zones |
| 3:00 PM | 5:30 PM | IST only |
| 4:00 PM | 6:30 PM | IST only |
| 5:00 PM | 7:30 PM | — |
| 6:00 PM | 8:30 PM | — |
| 7:00 PM | 9:30 PM | — |
| 8:00 PM | 10:30 PM | — |
| 9:00 PM | 11:30 PM | — |
| 10:00 PM | 12:30 AM next day | — |
| 11:00 PM | 1:30 AM next day | — |
What IST and SGT Actually Are
IST — India Standard Time
Mumbai, Delhi, Bengaluru, Chennai, Kolkata, Hyderabad — and Colombo. Standing at UTC+5:30 as written, and the region does not change its clocks, so that offset holds all year. IST also stands for Irish Standard Time (UTC+1) and Israel Standard Time (UTC+2). This page covers the Indian one, which is by far the most searched.
India runs a single time zone across a country wide enough for two, which is why sunrise in the north-east can come nearly two hours before Mumbai's. Proposals for a second zone resurface regularly and have never been adopted.
SGT — Singapore Time
Singapore. Standing at UTC+8:00 as written, and the region does not change its clocks, so that offset holds all year.
Singapore sits at a longitude that would put it near UTC+7, but moved to UTC+8 in 1982 to align with Malaysia and Hong Kong — a trade decision rather than a solar one.
What This Means in Practice
Expect times on the half hour
IST sits on a 30-minute offset rather than a whole hour, so a round number on one side is never a round number on the other. A 9:00 meeting becomes 30 minutes past the hour, which is exactly the detail calendar invitations get wrong when someone converts in their head.
A gap you can rely on
Neither region changes its clocks, so this difference holds every day of the year. A recurring meeting booked once stays correct — worth knowing, because most cross-border pairs cannot say that.
Major Cities in Each Zone
Cities on IST
Cities on SGT
Frequently Asked Questions
What is the time difference between IST and SGT?
SGT is 2 hours and 30 minutes ahead of IST.
What is 9:00 AM IST in SGT?
9:00 AM IST is 11:30 AM SGT.
What are the best hours to schedule a call between IST and SGT?
Between 9:00 AM and 3:00 PM IST, which is 11:30 AM to 5:30 PM SGT. Both sides are inside normal business hours through that window.
Does the difference between IST and SGT change during the year?
No. Neither region changes its clocks, so this gap is fixed all year round.
Does IST always mean India Standard Time?
IST also stands for Irish Standard Time (UTC+1) and Israel Standard Time (UTC+2). This page covers the Indian one, which is by far the most searched.