BST to CST: British Summer Time to Central Time

BST to CST Converter

British Summer Time sits 7 hours ahead of Central Standard Time. When it’s midday in London during summer, folks in Chicago are just starting their 5am. This matters when you’re ringing colleagues across the pond or catching a match broadcast from the States.

BST Date

BST Time

Quick Conversions

BST to CST Conversion Table

Here’s what the clock shows in each timezone throughout the day. BST runs 7 hours ahead, so early morning in Chicago matches up with early afternoon in Britain.

BST (UTC+1)	CST (UTC-6)	Period
00:00 (Midnight)	17:00 (5:00 PM)	Previous Day
01:00	18:00 (6:00 PM)	Previous Day
02:00	19:00 (7:00 PM)	Previous Day
03:00	20:00 (8:00 PM)	Previous Day
04:00	21:00 (9:00 PM)	Previous Day
05:00	22:00 (10:00 PM)	Previous Day
06:00	23:00 (11:00 PM)	Previous Day
07:00	00:00 (Midnight)	Same Day Starts
08:00	01:00	Same Day
09:00	02:00	Same Day
10:00	03:00	Same Day
11:00	04:00	Same Day
12:00 (Noon)	05:00	Same Day
13:00 (1:00 PM)	06:00	Same Day
14:00 (2:00 PM)	07:00	Same Day
15:00 (3:00 PM)	08:00	Same Day
16:00 (4:00 PM)	09:00	Same Day
17:00 (5:00 PM)	10:00	Same Day
18:00 (6:00 PM)	11:00	Same Day
19:00 (7:00 PM)	12:00 (Noon)	Same Day
20:00 (8:00 PM)	13:00 (1:00 PM)	Same Day
21:00 (9:00 PM)	14:00 (2:00 PM)	Same Day
22:00 (10:00 PM)	15:00 (3:00 PM)	Same Day
23:00 (11:00 PM)	16:00 (4:00 PM)	Same Day

How to Convert

Converting between these timezones takes just one step. Subtract 7 hours from BST to get CST. If you’re going the other way, add 7 hours to CST for BST.

Formula: CST Time = BST Time – 7 hours
Reverse: BST Time = CST Time + 7 hours

Step-by-Step Process

Take your current BST time
Subtract 7 hours from it
Check if this pushes you into the previous day (happens before 7:00 BST)
That’s your CST time sorted

Example: It’s 15:00 BST in London. Subtract 7 hours and you get 08:00 CST in Chicago on the same day.

Before 7am example: It’s 03:00 BST on Wednesday. Subtract 7 hours and you get 20:00 (8pm) CST on Tuesday evening.

Best Times for Calls

Scheduling a ring between BST and CST zones needs a bit of thought. You want both sides awake and alert. The sweet spot usually falls in the afternoon for BST and morning for CST.

BST Time	CST Time	Suitability
14:00 – 16:00	07:00 – 09:00	Good for both (BST afternoon, CST early morning)
16:00 – 18:00	09:00 – 11:00	Brilliant (BST late afternoon, CST mid-morning)
18:00 – 20:00	11:00 – 13:00	Works well (BST evening, CST lunch hours)
20:00 – 22:00	13:00 – 15:00	Decent (BST late evening, CST afternoon)

When Each Timezone Applies

BST only runs during British summer months. The UK switches to GMT when autumn arrives. CST covers winter months in central North America, switching to CDT when daylight saving kicks in.

BST Schedule

Starts: Last Sunday in March at 01:00 GMT (clocks forward)
Ends: Last Sunday in October at 02:00 BST (clocks back)
Offset: UTC+1
Used by: England, Scotland, Wales, Northern Ireland

CST Schedule

Active: First Sunday in November to second Sunday in March
Offset: UTC-6
Major cities: Chicago, Houston, Dallas, San Antonio
Becomes CDT (UTC-5) during summer months

Watch out: The time difference shifts to 6 hours when the US switches to CDT (Central Daylight Time) while the UK stays on BST. Both locations observe daylight saving, but the changeover dates don’t match up.

Where These Timezones Matter

BST covers the British Isles during warmer months. You’ll find it in London, Manchester, Edinburgh, Cardiff, and Belfast. CST stretches across a chunk of North America, hitting major cities and several countries.

BST Locations

United Kingdom (England, Scotland, Wales, Northern Ireland)
Crown Dependencies (Guernsey, Jersey, Isle of Man)
Main cities: London, Birmingham, Liverpool, Glasgow, Leeds

CST Locations

United States (parts of): Texas, Illinois, Wisconsin, Minnesota, Iowa
Mexico: Most of the country including Mexico City
Central America: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua
Canada: Parts of Manitoba, Ontario, Saskatchewan
Key cities: Chicago, Houston, Dallas, Mexico City, Winnipeg

Related Timezone Conversions

If you’re juggling multiple timezones, these related conversions might come in handy. They work with BST and CST but branch into nearby zones.

From	To	Difference
BST	EST	BST is 5 hours ahead
BST	PST	BST is 8 hours ahead
BST	MST	BST is 7 hours ahead
GMT	CST	GMT is 6 hours ahead
BST	CDT	BST is 6 hours ahead
CET	CST	CET is 7 hours ahead

FAQs

How many hours is BST ahead of CST?

BST sits 7 hours ahead of CST. When London shows 19:00 BST, Chicago displays 12:00 CST on the same day. This gap stays steady whilst both zones remain on their respective time standards.

Does the time difference change during the year?

Yes, it shifts. BST only runs from late March to late October. Outside these months, the UK uses GMT. Meanwhile, CST becomes CDT in summer. The difference bounces between 5, 6, and 7 hours depending on which daylight saving periods overlap.

What’s the best time to ring someone in CST from BST?

Between 16:00 and 20:00 BST works brilliantly. This lands between 09:00 and 13:00 CST, catching normal office hours. Both parties stay within reasonable waking hours, and nobody’s eating breakfast in their pyjamas.

Which American cities follow CST?

Chicago, Houston, Dallas, San Antonio, Austin, Memphis, and Milwaukee all run on CST during winter. Mexico City also follows this timezone. Come summer, most switch to CDT, but the timezone boundaries stay the same.

Is CST the same as Central Time?

Not quite. Central Time is the region. CST (Central Standard Time) is winter, and CDT (Central Daylight Time) is summer. Most folks say “Central Time” to cover both, but the actual offset changes by an hour.

When do the clocks change for BST?

Clocks spring forward on the last Sunday in March at 01:00 GMT. They fall back on the last Sunday in October at 02:00 BST. You gain an hour’s kip in autumn and lose one in spring.

Can I schedule a meeting at midnight BST for CST colleagues?

You could, but they won’t thank you. Midnight BST converts to 17:00 (5pm) the previous day in CST. Whilst that’s technically office hours, it’s pushing towards home time. Better to schedule earlier in your day for their morning.

What happens between 00:00 and 07:00 BST?

These hours fall on the previous day in CST. If it’s 03:00 BST Wednesday morning, CST shows 20:00 (8pm) Tuesday evening. The date changes at 07:00 BST, which equals midnight CST.