CST to GMT Time Converter
Greenwich Mean Time (GMT) is currently 6 hours ahead of Central Standard Time (CST). CST is UTC-6 and GMT is UTC+0. The table below converts every hour of the day between the two, and the call planner shows where working hours line up.
Best Time for a Call
Both sides are inside 9:00 AM to 5:00 PM office hours between 9:00 AM and 11:00 AM in CST, which is 3:00 PM to 5:00 PM in GMT.
Comparing more than two places? The Overlap Zones tool shows working hours for several cities on one grid.
Hour by Hour: CST to GMT
Rows marked office hours fall between 9:00 AM and 5:00 PM in both places. For a specific date, use the interactive converter.
Does the Difference Change During the Year?
CST and GMT are fixed offsets, so the difference between them never changes.
This page covers North American Central Standard Time, UTC-6. The region switches to CDT (UTC-5) in summer. CST can also refer to China Standard Time, which is UTC+8.
GMT is UTC+0 and never shifts. The UK is on GMT in winter but moves to BST (UTC+1) from late March to late October.
Frequently Asked Questions
How many hours ahead is GMT compared to CST?
GMT is currently 6 hours ahead of CST. CST and GMT are fixed offsets, so the difference between them never changes.
What time is 9:00 AM in CST in GMT?
9:00 AM in CST is 3:00 PM in GMT.
What is the best time for a call between CST and GMT?
Both sides are inside 9:00 AM to 5:00 PM office hours between 9:00 AM and 11:00 AM in CST, which is 3:00 PM to 5:00 PM in GMT.