BST to PST Time Converter

British Summer Time sits 9 hours ahead of Pacific Standard Time. When Londoners wrap up their working day at 5pm, folks in Los Angeles are just starting theirs at 8am. This page helps you convert between BST and PST with precision, whether you’re scheduling a business meeting, catching up with family, or coordinating a live event across the Atlantic and then some.

Quick Conversions

BST Time

British Summer Time (UTC+1)

PST Time

Pacific Standard Time (UTC-8)

BST to PST Conversion Table

This table shows common time conversions from BST to PST throughout the day. BST runs 9 hours ahead, so afternoon in Britain means early morning on America’s West Coast.

BST (UTC+1)	PST (UTC-8)	Day Difference
00:00 (Midnight)	15:00 (3:00 PM)	Previous day
03:00 (3:00 AM)	18:00 (6:00 PM)	Previous day
06:00 (6:00 AM)	21:00 (9:00 PM)	Previous day
09:00 (9:00 AM)	00:00 (Midnight)	Same day
12:00 (Noon)	03:00 (3:00 AM)	Same day
15:00 (3:00 PM)	06:00 (6:00 AM)	Same day
17:00 (5:00 PM)	08:00 (8:00 AM)	Same day
18:00 (6:00 PM)	09:00 (9:00 AM)	Same day
20:00 (8:00 PM)	11:00 (11:00 AM)	Same day
22:00 (10:00 PM)	13:00 (1:00 PM)	Same day

How the Conversion Works

Basic Formula: PST Time = BST Time – 9 hours

Step 1: Take your BST time (e.g., 15:00)

Step 2: Subtract 9 hours (15:00 – 9 = 06:00)

Step 3: Check if the result goes into the previous day (times before 09:00 BST will be previous day in PST)

Step 4: Your result is 06:00 PST

The large time difference means careful planning matters. A 9-hour gap crosses multiple sleep cycles, work hours, and even calendar days. BST times before 9am convert to the previous day in PST.

Daylight Saving Considerations

Remember that BST only exists during British summer months (late March to late October). Outside this period, the UK uses GMT (Greenwich Mean Time, UTC+0), creating an 8-hour difference. Similarly, Pacific regions switch to PDT (Pacific Daylight Time, UTC-7) during their summer months, also resulting in an 8-hour gap. The 9-hour difference specifically applies when comparing BST with PST.

Important: Always verify which timezone abbreviation applies for your specific date. The UK switches between GMT and BST, whilst the US West Coast alternates between PST and PDT. These changes don’t happen simultaneously, creating brief periods where the offset shifts.

Time Zone Comparison

British Summer Time (BST)

Offset: UTC+1
Active: Late March to late October
Regions: England, Scotland, Wales, Northern Ireland
Major cities: London, Birmingham, Glasgow, Liverpool
Winter equivalent: GMT (UTC+0)

Pacific Standard Time (PST)

Offset: UTC-8
Active: Early November to early March
Regions: US West Coast, British Columbia
Major cities: Los Angeles, San Francisco, Seattle, Vancouver
Summer equivalent: PDT (UTC-7)

Best Meeting Times Between BST and PST

Finding suitable meeting windows between these zones requires compromise. Here are the most practical options for video calls and conference meetings.

BST Time	PST Time	Suitability
16:00 – 17:00	08:00 – 09:00	Ideal for both parties
17:00 – 18:00	09:00 – 10:00	Excellent timing
18:00 – 19:00	10:00 – 11:00	Works well for regular meetings
19:00 – 20:00	11:00 – 12:00	Late for BST, acceptable occasionally
09:00 – 10:00	01:00 – 02:00	Only for urgent matters

The sweet spot typically falls between 4pm-7pm BST (8am-11am PST). This accommodates standard working hours in both locations without requiring anyone to wake unusually early or stay late into the evening.

When Each Time Zone Applies

Both BST and PST operate seasonally, which affects your conversions throughout the year. Here’s when each timezone is active and what replaces it during the off-season.

BST Calendar

BST starts on the last Sunday in March at 1am GMT (clocks move forward to 2am BST). It ends on the last Sunday in October at 2am BST (clocks move back to 1am GMT). During the winter months, the UK operates on Greenwich Mean Time, which sits at UTC+0 rather than UTC+1.

PST Calendar

PST begins on the first Sunday in November at 2am PDT (clocks move back to 1am PST). It ends on the second Sunday in March at 2am PST (clocks move forward to 3am PDT). During summer months, the Pacific coast uses Pacific Daylight Time, which sits at UTC-7 rather than UTC-8.

Overlap periods: From late March to early November, you’ll find BST overlapping with PDT (8-hour difference). From early November to late March, GMT overlaps with PST (also 8-hour difference). The 9-hour BST-to-PST difference only exists during brief transition periods when one region has switched to summer time whilst the other hasn’t yet.

Practical Scheduling Examples

Here are real-world scenarios showing how the BST-PST conversion affects everyday activities and professional commitments.

Business Meetings

A London office schedules a video conference for 5pm BST on Wednesday. Their Los Angeles colleagues join at 8am PST, also on Wednesday. Both teams can participate during standard working hours, making this an optimal choice for regular catch-ups.

Live Events and Broadcasts

A football match kicks off at 8pm BST on Saturday evening. Fans in California tune in at 11am PST on Saturday morning. The timing suits UK evening audiences whilst remaining accessible for Pacific viewers during daytime hours.

Family Calls

Someone in Birmingham wants to video call relatives in Seattle after dinner. Ringing at 8pm BST means catching them at 11am PST, likely during their late morning when they’re available and alert.

Related Time Conversions

From	To	Difference
BST	GMT	-1 hour
BST	PDT	-8 hours
BST	EST	-5 hours
BST	AEST	+9 hours
GMT	PST	-8 hours
PST	EST	+3 hours

FAQs

What’s the time difference between BST and PST?

BST sits 9 hours ahead of PST. When it’s noon in London during British Summer Time, it’s 3am in Los Angeles during Pacific Standard Time. This large gap means scheduling requires careful thought to find mutually convenient hours.

Does the time difference change during the year?

Yes, it varies because both regions observe daylight saving time but switch on different dates. The 9-hour BST-to-PST gap only exists during brief transition periods. Most of the year, you’ll be comparing either GMT with PST (8 hours) or BST with PDT (also 8 hours).

When is BST in effect?

BST runs from the last Sunday in March through the last Sunday in October. Outside these dates, the UK uses GMT. The changeover happens at 1am GMT when clocks spring forward to 2am BST in March, then at 2am BST when clocks fall back to 1am GMT in October.

When is PST in effect?

PST operates from the first Sunday in November through the second Sunday in March. The Pacific coast then switches to PDT for the warmer months. Clocks fall back from 2am PDT to 1am PST in November, then spring forward from 2am PST to 3am PDT in March.

What’s the best time for a meeting between BST and PST?

Between 4pm-7pm BST works best for most business meetings, corresponding to 8am-11am PST. This window respects conventional working hours in both locations without pushing anyone into uncomfortable early mornings or late evenings.

Will my BST time convert to the same day in PST?

Not always. Any BST time before 9am converts to the previous day in PST. For example, 8am BST Tuesday becomes 11pm PST Monday. Times from 9am BST onwards stay on the same calendar day when converted.

How do I remember which direction to convert?

Think of it this way: the UK sits far ahead of the US West Coast. BST is much earlier in the day compared to PST, so subtract hours when going from BST to PST (subtract 9), and add hours when going from PST to BST (add 9).

Can I use this during winter months?

Technically no, because BST doesn’t exist during winter. The UK uses GMT from late October to late March. However, the conversion between GMT and PST remains 8 hours, so you’d subtract 8 hours instead of 9 when converting British time to Pacific time during winter.