SGT to IST Time Converter
IST is 2 hours and 30 minutes behind SGT. SGT is UTC+8:00, and IST is UTC+5:30.
Best Time to Call Between SGT and IST
Both zones are inside normal business hours between 12:00 PM and 5:00 PM SGT — that's 9:30 AM to 2:30 PM IST. That's a 5-hour window.
both at work SGT only IST only neither — hours along the strip are SGT.
Common Times Converted
SGT on the left, IST on the right.
SGT to IST: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| SGT | IST | Working hours |
|---|---|---|
| 12:00 AM | 9:30 PM prev day | — |
| 1:00 AM | 10:30 PM prev day | — |
| 2:00 AM | 11:30 PM prev day | — |
| 3:00 AM | 12:30 AM | — |
| 4:00 AM | 1:30 AM | — |
| 5:00 AM | 2:30 AM | — |
| 6:00 AM | 3:30 AM | — |
| 7:00 AM | 4:30 AM | — |
| 8:00 AM | 5:30 AM | — |
| 9:00 AM | 6:30 AM | SGT only |
| 10:00 AM | 7:30 AM | SGT only |
| 11:00 AM | 8:30 AM | SGT only |
| 12:00 PM | 9:30 AM | Both zones |
| 1:00 PM | 10:30 AM | Both zones |
| 2:00 PM | 11:30 AM | Both zones |
| 3:00 PM | 12:30 PM | Both zones |
| 4:00 PM | 1:30 PM | Both zones |
| 5:00 PM | 2:30 PM | IST only |
| 6:00 PM | 3:30 PM | IST only |
| 7:00 PM | 4:30 PM | IST only |
| 8:00 PM | 5:30 PM | — |
| 9:00 PM | 6:30 PM | — |
| 10:00 PM | 7:30 PM | — |
| 11:00 PM | 8:30 PM | — |
What SGT and IST Actually Are
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.
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.
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 SGT
Cities on IST
Frequently Asked Questions
What is the time difference between SGT and IST?
IST is 2 hours and 30 minutes behind SGT.
What is 9:00 AM SGT in IST?
9:00 AM SGT is 6:30 AM IST.
What are the best hours to schedule a call between SGT and IST?
Between 12:00 PM and 5:00 PM SGT, which is 9:30 AM to 2:30 PM IST. Both sides are inside normal business hours through that window.
Does the difference between SGT and IST 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.