What cities share the same time zone right now?

Cities share the same UTC offset when they observe the same standard time. For example, London, Casablanca, and Reykjavik all run on UTC±0 outside DST. This page groups every city in our database by its current live UTC offset so you can see all co-timezone cities at a glance.

Why do some time zones have half-hour or 45-minute offsets?

Some countries chose UTC offsets that better reflect their geographic position. India uses UTC+5:30, Nepal UTC+5:45, Iran UTC+3:30, and Australia's central states UTC+9:30. These fractional offsets were often set to split the difference between neighboring whole-hour zones.

How many UTC offsets are in use worldwide?

There are currently around 38 distinct UTC offsets in active use, ranging from UTC−12 (Baker Island) to UTC+14 (Line Islands, Kiribati). This page lists every offset that has at least one city in our database.

Do daylight saving time changes affect which cities share an offset?

Yes. When one city observes DST and another does not, their UTC offsets temporarily diverge. For example, during European summer time, London (BST, UTC+1) no longer matches Reykjavik (UTC±0). This page always shows the current live offset, so groupings shift with each DST transition.

What is the difference between a UTC offset and an IANA time zone?

A UTC offset (e.g. UTC+5:30) is just a number describing how far ahead or behind UTC a location currently is. An IANA time zone (e.g. Asia/Kolkata) is a named rule set that tracks the full history of offset changes, DST transitions, and naming for a region. Multiple IANA zones can share the same current UTC offset.

UTC−10

UTC−8

UTC−7

UTC−6

UTC−5

UTC−4

UTC−3

UTC−2:30

UTC−1

UTC±0

UTC+1

UTC+2

UTC+3

UTC+3:30

UTC+4

UTC+4:30

UTC+5

UTC+5:30

UTC+5:45

UTC+6

UTC+6:30

UTC+7

UTC+8

UTC+9

UTC+9:30

UTC+10

UTC+11

UTC+12

UTC+13

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