GST to CST Time Converter
CST is 9 hours behind GST. GST is UTC+4:00, and The US Central states are currently on CDT (UTC-5:00).
Best Time to Call Between GST and CST
Standard 9-to-5 hours in these two zones never overlap, so someone has to take the call outside their working day. The most workable window is 4:00 PM to 10:00 PM GST, which is 7:00 AM to 1:00 PM CST.
both at work GST only CST only neither — hours along the strip are GST.
Common Times Converted
GST on the left, CST on the right.
GST to CST: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| GST | CST | Working hours |
|---|---|---|
| 12:00 AM | 3:00 PM prev day | CST only |
| 1:00 AM | 4:00 PM prev day | CST only |
| 2:00 AM | 5:00 PM prev day | — |
| 3:00 AM | 6:00 PM prev day | — |
| 4:00 AM | 7:00 PM prev day | — |
| 5:00 AM | 8:00 PM prev day | — |
| 6:00 AM | 9:00 PM prev day | — |
| 7:00 AM | 10:00 PM prev day | — |
| 8:00 AM | 11:00 PM prev day | — |
| 9:00 AM | 12:00 AM | GST only |
| 10:00 AM | 1:00 AM | GST only |
| 11:00 AM | 2:00 AM | GST only |
| 12:00 PM | 3:00 AM | GST only |
| 1:00 PM | 4:00 AM | GST only |
| 2:00 PM | 5:00 AM | GST only |
| 3:00 PM | 6:00 AM | GST only |
| 4:00 PM | 7:00 AM | GST only |
| 5:00 PM | 8:00 AM | — |
| 6:00 PM | 9:00 AM | CST only |
| 7:00 PM | 10:00 AM | CST only |
| 8:00 PM | 11:00 AM | CST only |
| 9:00 PM | 12:00 PM | CST only |
| 10:00 PM | 1:00 PM | CST only |
| 11:00 PM | 2:00 PM | CST only |
What GST and CST Actually Are
GST — Gulf Standard Time
Dubai, Abu Dhabi, Sharjah, Muscat. Standing at UTC+4:00 as written, and the region does not change its clocks, so that offset holds all year. GST also refers to South Georgia Time (UTC-2), which you are very unlikely to want.
The Gulf states have never observed daylight saving, so Dubai's offset has been unchanged for decades — unusual stability for a region that grew as fast as it did.
CST — Central Standard Time
Chicago, Houston, Dallas, Mexico City, Winnipeg. Standing at UTC-6:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, November 1, 2026, to CST. CST also stands for China Standard Time (UTC+8) and Cuba Standard Time (UTC-5). This page covers the North American one.
Saskatchewan sits inside the Central zone but never changes its clocks, so it matches CST in winter and its neighbors' MDT in summer.
What This Means in Practice
This gap is not fixed
CST changes its clocks and GST does not, so the difference between them moves by an hour twice a year. A recurring meeting set now will drift for one side from Sunday, November 1, 2026 unless someone resets it.
Major Cities in Each Zone
Cities on GST
Cities on CST
Frequently Asked Questions
What is the time difference between GST and CST?
CST is 9 hours behind GST. That is the live figure. Taken strictly as written, the gap between GST and CST is 10 hours — the two differ because at least one of these regions is currently on daylight saving.
What is 9:00 AM GST in CST?
9:00 AM GST is 12:00 AM CST.
What are the best hours to schedule a call between GST and CST?
Standard business hours in these two zones do not overlap at all, so one side has to work outside the 9-to-5. The most workable window is 4:00 PM to 10:00 PM GST, which is 7:00 AM to 1:00 PM CST.
Does the difference between GST and CST change during the year?
Yes. CST observes daylight saving and GST does not, so the gap shifts by an hour at least twice a year. The next clock change is on Sunday, November 1, 2026.
Does GST always mean Gulf Standard Time?
GST also refers to South Georgia Time (UTC-2), which you are very unlikely to want.
Does CST always mean Central Standard Time?
CST also stands for China Standard Time (UTC+8) and Cuba Standard Time (UTC-5). This page covers the North American one.