GMT to CST Time Converter
Central Standard Time (CST) is currently 6 hours behind Greenwich Mean Time (GMT). GMT is UTC+0 and CST is UTC-6. 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 3:00 PM and 5:00 PM in GMT, which is 9:00 AM to 11:00 AM in CST.
Comparing more than two places? The Overlap Zones tool shows working hours for several cities on one grid.
Hour by Hour: GMT to CST
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?
GMT and CST are fixed offsets, so the difference between them never changes.
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.
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.
Frequently Asked Questions
How many hours behind is CST compared to GMT?
CST is currently 6 hours behind GMT. GMT and CST are fixed offsets, so the difference between them never changes.
What time is 9:00 AM in GMT in CST?
9:00 AM in GMT is 3:00 AM in CST.
What is the best time for a call between GMT and CST?
Both sides are inside 9:00 AM to 5:00 PM office hours between 3:00 PM and 5:00 PM in GMT, which is 9:00 AM to 11:00 AM in CST.