Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

BST to NZDT

+12h

BST

BSTSOURCE

UTC+01:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

NZDT

UTC+13:00☀ DST active

HH12

MM00

(next day)00:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

BST

NZDT

12:00 AM

12:00 PM

2:00 AM

2:00 PM

4:00 AM

4:00 PM

6:00 AM

6:00 PM

8:00 AM

8:00 PM

10:00 AM

10:00 PM

12:00 PM

12:00 AM+1

2:00 PM

2:00 AM+1

4:00 PM

4:00 AM+1

6:00 PM

6:00 AM+1

8:00 PM

8:00 AM+1

10:00 PM

10:00 AM+1

Green rows indicate typical business hours (9 AM - 5 PM)

BST and NZDT on the World Map

The map below highlights the BST (British Summer Time) and NZDT (New Zealand Daylight Time) timezone regions across the globe.

BST Zone

→

NZDT Zone

Explore all world timezones interactively →

BST – British Summer Time

UTC+01:00

British Summer Time (BST, UTC+01:00) is the daylight saving period in the United Kingdom, running from late March to late October.

Countries in BST

United Kingdom

Major Cities in BST

LondonBirminghamManchesterGlasgowEdinburghCardiffBelfastLiverpoolBristolLeeds

Key Facts about BST

•BST runs from the last Sunday in March to the last Sunday in October.
•BST is exactly one hour ahead of GMT, the UK's standard time.
•During BST, London is 4 hours ahead of New York while the US is on Eastern Daylight Time.
•The Isle of Man and the Channel Islands also observe BST.

Daylight Saving:Yes – switches to BST

Learn more about BST on Wikipedia

NZDT – New Zealand Daylight Time

UTC+13:00

New Zealand Daylight Time (NZDT, UTC+13:00) is New Zealand's summer time zone, one of the earliest offsets in the world.

Countries in NZDT

New Zealand

Major Cities in NZDT

AucklandWellingtonChristchurchHamiltonDunedin

Key Facts about NZDT

•NZDT runs from the last Sunday in September to the first Sunday in April.
•NZDT is UTC+13:00 — one of the earliest time offsets used anywhere.
•New Zealand changes its clocks two to three weeks before Australia.
•The Chatham Islands observe UTC+13:45 during their summer time.

Daylight Saving:Yes – switches to NZDT

Learn more about NZDT on Wikipedia

BST to NZDT Time Difference – Complete Guide

BST runs on British Summer Time (BST) at UTC+01:00. NZDT runs on New Zealand Daylight Time (NZDT) at UTC+13:00. That puts BST 12 hours ahead of NZDT — a difference of +12h at the current offsets.

In practice, when it is 9:00 AM in BST it is 9:00 PM in NZDT. Midnight in BST is 12:00 PM in NZDT. Neither zone observes daylight saving time, so the offset between them stays constant all year.

BST to NZDT time conversion table

BST (BST)	NZDT (NZDT)	Day
12:00 AM	12:00 PM	same day
6:00 AM	6:00 PM	same day
7:00 AM	7:00 PM	same day
8:00 AM	8:00 PM	same day
9:00 AM	9:00 PM	same day
12:00 PM	12:00 AM	next day
3:00 PM	3:00 AM	next day
5:00 PM	5:00 AM	next day
6:00 PM	6:00 AM	next day
9:00 PM	9:00 AM	next day

Why people convert BST to NZDT time

Scheduling a call from BST to NZDT: a 10:00 AM start in BST lands at 10:00 PM in NZDT, so you can confirm the slot without doing the arithmetic yourself.
Handling a +12h gap: BST and NZDT have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in NZDT is 9:00 PM in BST.
Booking travel or deliveries: tracking NZDT local time against BST keeps pickup windows and arrival estimates honest across the +12h offset.

Always state the zone abbreviation, not just the hour. "3:00 PM BST" is unambiguous; "3 PM" across a +12h gap is not.
With a +12h gap there is no shared 9-to-5 window, so alternate the early start: one week BST takes the early slot, the next week NZDT does.

About BST (British Summer Time)

British Summer Time (BST) is the daylight saving period in the United Kingdom, when clocks move one hour forward from Greenwich Mean Time (GMT, UTC+00:00) to UTC+01:00. It runs from the last Sunday in March to the last Sunday in October. England, Scotland, Wales and Northern Ireland all follow it, along with the Isle of Man and the Channel Islands of Jersey and Guernsey. During BST, London is one hour ahead of UTC, four hours ahead of New York on Eastern Daylight Time, and five hours ahead of New York once the United States returns to Eastern Standard Time in November. BST is also used to abbreviate Bangladesh Standard Time (UTC+06:00), which is listed separately on this site.

About NZDT (New Zealand Daylight Time)

New Zealand Daylight Time (NZDT) is the summer time zone for New Zealand, one hour ahead of New Zealand Standard Time (NZST, UTC+12:00). It runs from the last Sunday in September to the first Sunday in April, so New Zealand shifts a week or two earlier in spring than Australia. At UTC+13:00, NZDT is among the earliest offsets in the world — only Samoa, Tonga and parts of Kiribati run further ahead at certain times of year. Auckland and Wellington are 13 hours ahead of UTC during NZDT, 12 hours ahead of Sydney, and 18 hours ahead of New York. The Chatham Islands, 45 minutes further east, move to UTC+13:45.

Best time to call between BST and NZDT

With a +12h offset there is no overlap inside a normal 9 AM – 5 PM day. NZDT opens at 9:00 AM NZDT, which is 9:00 PM in BST, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

BST and NZDT have no shared working hours because of the +12h gap. Teams need to alternate early starts or rely on asynchronous handovers.

BST is 12 hours ahead of NZDT (BST UTC+01:00 → NZDT UTC+13:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

BST

☀ Currently in DST

Standard: UTC+00:00 · DST: UTC+01:00

Clocks fall back on Sun, Oct 25, 2026

NZDT

☀ Currently in DST

Standard: UTC+12:00 · DST: UTC+13:00

Clocks fall back on Sat, Apr 3, 2027

Learn More About Time

Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between BST and NZDT?

BST (BST, UTC+01:00) is 12 hours ahead of NZDT (NZDT, UTC+13:00). The gap is currently +12h.

How do I convert BST time to NZDT time?

Add +12h to BST local time. For example, 9:00 AM in BST is 9:00 PM in NZDT.

What time is it in NZDT right now?

NZDT uses NZDT at UTC+13:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +12h offset from BST.