GMT ↔ CST Time Converter

Central Standard Time (CST) is 6h behind of Greenwich Mean Time (GMT). The offset comes from GMT being at UTC+0 / UTC+1 (BST) and CST at UTC-6 / UTC-5 (CDT). For example, when it is 9:00 AM in London, it is 3:00 AM in Chicago.

To convert GMT to CST, subtract 6 hours to the GMT time. For instance, 12:00 PM GMT becomes 6:00 AM CST. For times that cross midnight, remember to adjust the date accordingly — a "+1 Day" or "-1 Day" note in the converter above flags this automatically. You can also just type directly into the converter fields on this page for instant results.

Central Standard Time (CST) is 6h behind of Greenwich Mean Time (GMT). Put the other way, GMT is 6h ahead of CST. If someone in Chicago says "let's meet at noon," that translates to 6:00 PM in London.

Greenwich Mean Time (GMT) is the standard clock time used in regions including London, Dublin, Lisbon, Reykjavik. It runs at UTC+0 / UTC+1 (BST) relative to Coordinated Universal Time (UTC). It observes Daylight Saving Time, advancing clocks by one hour during summer, so the effective offset changes seasonally.

Central Standard Time (CST) is the standard clock time used in regions including Chicago, Dallas, Houston, Minneapolis. It runs at UTC-6 / UTC-5 (CDT) relative to Coordinated Universal Time (UTC). It observes Daylight Saving Time, so the effective offset can shift by one hour during parts of the year.

The best window for meetings between GMT and CST is when standard business hours (9 AM – 6 PM) overlap in both zones. Given that CST is 6h behind of GMT, mornings in the earlier zone tend to align with afternoons in the later zone. Refer to the meeting hours table above to find the exact windows that fall within working hours for both sides. Avoid scheduling calls where one side falls before 7 AM or after 9 PM — those hours are shaded in the table.

Simply type a time into the CST field in the bidirectional converter above — it works equally well in both directions and updates the GMT result instantly. Alternatively, add 6 hours from the CST time to get the GMT equivalent. You can also visit the reverse page: CST to GMT converter.

Yes, for some hours they do. Whenever a converted time crosses midnight, the converter above displays a "+1 Day" or "-1 Day" indicator next to the result. The 24-hour table on this page also shows the day change in the Day column. Always check this when scheduling across these two zones to avoid date confusion in calendar invites.

Greenwich Mean Time (GMT) is used by cities and regions including: London, Dublin, Lisbon, Reykjavik, Accra, Abidjan, Dakar. The zone covers UTC+0 / UTC+1 (BST)and shifts during Daylight Saving Time.

Central Standard Time (CST) is observed in cities and regions including: Chicago, Dallas, Houston, Minneapolis, Kansas City, New Orleans, Winnipeg. It runs at UTC-6 / UTC-5 (CDT)and may shift during Daylight Saving periods.

Yes. GMT observes Daylight Saving Time and shifts clocks by one hour seasonally. CST also observes Daylight Saving Time. When only one zone is in DST, the gap between the two changes by one hour. The live clocks and converter on this page use the IANA timezone database and adjust automatically, so you always see the current accurate offset without needing to track DST manually.