utc now / zones / gmt-to-cst

GMT to CST converter

CST is 5 hours behind GMT right now. Live clocks on both sides, a direct time input, the full 24-hour table with a permalink per hour, and the real daylight-saving state — computed from the IANA tz database on every request, never from a stored offset.

Greenwich Mean Time · Etc/GMT
23:21:53
Wednesday, 12 August 2026 · GMT · UTC+00:00
⇄
Central Standard Time · America/Chicago
18:21:53
Wednesday, 12 August 2026 · CDT · UTC-05:00 · DST

Convert an exact time type it — no sliders

18:21
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Conversion runs in your browser against the same IANA rules the server uses, so it keeps working offline and nothing you type is sent anywhere.

Daylight saving right now

Central Standard Time

America/Chicago is currently on CDT (UTC-05:00), its daylight-saving clock. That is not CST — this page is named for the abbreviation people search for, and tells you the truth about which one is actually in force.

next change: Sun, 1 Nov 2026 01:00 local → CST (80 days, clocks go back)

CST is US Central Time in winter; Chicago and Dallas move to CDT (UTC-5) in summer. CST is also China Standard Time (UTC+8) and Cuba Standard Time (UTC-5) — check which one your data means.

Greenwich Mean Time

Etc/GMT is on GMT (UTC+00:00).

no clock change scheduled — fixed at UTC+00:00

GMT is UTC+0 and never shifts. The UK observes GMT in winter only — in summer it is on BST (UTC+1), so "GMT" on a British invite dated in July usually means BST.

Best time to call green = 09:00–18:00 on both sides

4 overlapping working hours. The longest run is 14:00–18:00 GMT, which is 09:00–13:00 CST.

Google Calendar Outlook download .ics

GMT to CST, hour by hour 12 August 2026 · every row is a permalink

GMT CST 12-hour Day Permalink
00:00 19:00 CDT 7:00 PM previous day 00:00 →
01:00 20:00 CDT 8:00 PM previous day 01:00 →
02:00 21:00 CDT 9:00 PM previous day 02:00 →
03:00 22:00 CDT 10:00 PM previous day 03:00 →
04:00 23:00 CDT 11:00 PM previous day 04:00 →
05:00 00:00 CDT 12:00 AM same day 05:00 →
06:00 01:00 CDT 1:00 AM same day 06:00 →
07:00 02:00 CDT 2:00 AM same day 07:00 →
08:00 03:00 CDT 3:00 AM same day 08:00 →
09:00 04:00 CDT 4:00 AM same day 09:00 →
10:00 05:00 CDT 5:00 AM same day 10:00 →
11:00 06:00 CDT 6:00 AM same day 11:00 →
12:00 07:00 CDT 7:00 AM same day 12:00 →
13:00 08:00 CDT 8:00 AM same day 13:00 →
14:00 09:00 CDT 9:00 AM same day 14:00 →
15:00 10:00 CDT 10:00 AM same day 15:00 →
16:00 11:00 CDT 11:00 AM same day 16:00 →
17:00 12:00 CDT 12:00 PM same day 17:00 →
18:00 13:00 CDT 1:00 PM same day 18:00 →
19:00 14:00 CDT 2:00 PM same day 19:00 →
20:00 15:00 CDT 3:00 PM same day 20:00 →
21:00 16:00 CDT 4:00 PM same day 21:00 →
22:00 17:00 CDT 5:00 PM same day 22:00 →
23:00 18:00 CDT 6:00 PM same day 23:00 →

Every hour as its own page

00:00 GMT 01:00 GMT 02:00 GMT 03:00 GMT 04:00 GMT 05:00 GMT 06:00 GMT 07:00 GMT 08:00 GMT 09:00 GMT 10:00 GMT 11:00 GMT 12:00 GMT 13:00 GMT 14:00 GMT 15:00 GMT 16:00 GMT 17:00 GMT 18:00 GMT 19:00 GMT 20:00 GMT 21:00 GMT 22:00 GMT 23:00 GMT

GMT to CST — questions

What time is it in CST when it is GMT now?
CST is currently 18:21 on Wednesday, 12 August 2026 (CDT, UTC-05:00), while GMT is 23:21 (UTC+00:00). That is 5 hours behind the source clock right now.
How many hours behind is CST of GMT?
5 hours at this moment. The gap is not constant across the year: Greenwich Mean Time and Central Standard Time change clocks on different dates (or one of them not at all), so a difference you hard-code in summer can be an hour wrong in winter. The table on this page is computed from the current tzdata rules, not from a fixed offset.
Is CST on daylight saving time right now?
Central Standard Time is currently observing daylight saving — the live abbreviation is CDT (UTC-05:00), not CST.
When does CST next change its clocks?
America/Chicago next changes on Sunday, 01 November 2026 at 01:00 local time, when it moves back 60 minutes and the abbreviation becomes CST (UTC-06:00). That is 80 days away. This date comes from the IANA tzdata rules currently in force, so it updates if a government changes the law.
What is the best time to schedule a call between GMT and CST?
There are 4 hours of overlap where both sides are inside a 09:00-18:00 working day. The longest block is 14:00–18:00 GMT, which is 09:00–13:00 CST. Use the calendar buttons above to drop it straight into Google Calendar, Outlook or an .ics file.
Which IANA timezone name should I use for CST in code?
Use America/Chicago. Abbreviations like CST are ambiguous and not resolvable by most libraries — Python's ZoneInfo, Java's ZoneId, Go's time.LoadLocation and JavaScript's Intl all expect the IANA name. Hard-coding UTC-05:00 instead will be wrong the moment the rules change.

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