Convert any time between CST and GST, with a full 24-hour table and the hours when both sides are actually at work.

CST to GST Time Converter

GST is 9 hours ahead of CST. The US Central states are currently on CDT (UTC-5:00), and GST is UTC+4:00.

Worth knowing right now. The US Central states are currently on CDT, not CST, because daylight saving is in effect. The 9 hours above is the gap between those two regions today, which is almost certainly what you want. Taken strictly as written, CST to GST is 10 hours.
CST
Central Standard Time
10:45:43 AM
Sunday, October 11, 2026
UTC-5:00
+9:00
hours difference
⇆ Reverse
GST
Gulf Standard Time
07:45:43 PM
Sunday, October 11, 2026
UTC+4:00

Best Time to Call Between CST and GST

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 7:00 AM to 1:00 PM CST, which is 4:00 PM to 10:00 PM GST.

both at work CST only GST only neither  —  hours along the strip are CST.

CST to GST: Full 24-Hour Conversion Table

Shaded rows are working hours; the darker shade marks the hours when both zones are at work.

CSTGSTWorking hours
12:00 AM 9:00 AM GST only
1:00 AM 10:00 AM GST only
2:00 AM 11:00 AM GST only
3:00 AM 12:00 PM GST only
4:00 AM 1:00 PM GST only
5:00 AM 2:00 PM GST only
6:00 AM 3:00 PM GST only
7:00 AM 4:00 PM GST only
8:00 AM 5:00 PM —
9:00 AM 6:00 PM CST only
10:00 AM 7:00 PM CST only
11:00 AM 8:00 PM CST only
12:00 PM 9:00 PM CST only
1:00 PM 10:00 PM CST only
2:00 PM 11:00 PM CST only
3:00 PM 12:00 AM next day CST only
4:00 PM 1:00 AM next day CST only
5:00 PM 2:00 AM next day —
6:00 PM 3:00 AM next day —
7:00 PM 4:00 AM next day —
8:00 PM 5:00 AM next day —
9:00 PM 6:00 AM next day —
10:00 PM 7:00 AM next day —
11:00 PM 8:00 AM next day —

What CST and GST Actually Are

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.

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.

What This Means in Practice

The date changes mid-working-day

For 2 of the eight hours in a normal CST working day, the equivalent GST time falls on a different calendar date. Anything scheduled in that stretch needs the date checked as well as the time, or a Tuesday call quietly becomes a Wednesday one at the other end.

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.

Frequently Asked Questions

What is the time difference between CST and GST?

GST is 9 hours ahead of CST. That is the live figure. Taken strictly as written, the gap between CST and GST is 10 hours — the two differ because at least one of these regions is currently on daylight saving.

What is 9:00 AM CST in GST?

9:00 AM CST is 6:00 PM GST.

What are the best hours to schedule a call between CST and GST?

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 7:00 AM to 1:00 PM CST, which is 4:00 PM to 10:00 PM GST.

Does the difference between CST and GST 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 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.

Does GST always mean Gulf Standard Time?

GST also refers to South Georgia Time (UTC-2), which you are very unlikely to want.

Converting between two time zones regularly? Bookmark this page — the clocks update live and the table follows daylight saving automatically.