UTC+3:30 - Iran
Iran Standard Time is offset by 30 minutes from its neighbors to the west and east.
Understanding Time Zones, Offsets and Daylight Saving Time
Content last reviewed: July 20, 2026
A time zone is a region that keeps the same clock time, defined as an offset from Coordinated Universal Time (UTC). Most offsets are whole hours, such as UTC+1 or UTC-5, but a number of places use half-hour or even quarter-hour (45-minute) offsets instead. This guide explains how offsets and daylight saving time work, and which places use the less common ones. Use the world clock and meeting planner to compare any of these time zones side by side.
Half-Hour and 45-Minute Time Zones
A handful of countries and territories offset their clocks by 30 or 45 minutes instead of a full hour. These offsets are usually set for geographic or historical reasons, so that local solar time lines up more closely with the clock, or to keep a distinct time from a larger neighboring country.
UTC+4:30 - Afghanistan
Afghanistan Time sits 30 minutes off the surrounding Pakistan and Iran time zones.
UTC+5:30 - India and Sri Lanka
Indian Standard Time and Sri Lanka Standard Time both use a single half-hour offset for the whole country.
UTC+5:45 - Nepal
Nepal Time is one of the few 45-minute offsets in use today, chosen to reflect the country's exact longitude.
UTC+6:30 - Myanmar and the Cocos Islands
Myanmar Time uses a half-hour offset, distinct from neighboring Thailand and Bangladesh.
UTC+8:45 - Australian Central Western (Eucla)
An unofficial 45-minute offset used in a small area of Western Australia, between the Central and Western Australian zones.
UTC+9:30 - Central Australia
South Australia and the Northern Territory use a half-hour offset from the rest of the country.
UTC+10:30 / +11:00 - Lord Howe Island
One of the only places in the world where daylight saving time shifts the clock by just 30 minutes instead of a full hour.
UTC+12:45 / +13:45 - Chatham Islands
New Zealand's Chatham Islands use a 45-minute offset, shifting to +13:45 during daylight saving time.
UTC-3:30 - Newfoundland, Canada
Newfoundland Time is 30 minutes off Atlantic Time, used across the island of Newfoundland.
UTC-9:30 - Marquesas Islands
This French Polynesian island group uses a half-hour offset distinct from the rest of French Polynesia.
All of these offsets are built into WorldClockify, so you can add any of these locations directly by name and compare them against standard hourly time zones on the same timeline.
What Is Daylight Saving Time?
Daylight saving time (DST) is the practice of moving clocks forward by one hour during part of the year, typically in spring and summer, so that evening daylight lasts longer. Clocks are then moved back in autumn. The idea began in the early 20th century as a way to make better use of natural daylight, and today it is applied differently around the world, or not at all.
Northern Hemisphere
Most of North America and Europe observe DST from spring to autumn. In the European Union, clocks move forward on the last Sunday of March and back on the last Sunday of October, changing at 01:00 UTC. In the United States and Canada, DST generally runs from the second Sunday of March to the first Sunday of November, though the exact rule is set by national or local law and can change.
Southern Hemisphere
Countries such as Australia, New Zealand, and Chile observe DST on the opposite schedule, since their summer falls between roughly October and April. Clocks typically move forward in local spring (around September or October) and back in local autumn (around March or April).
Regions Without DST
Most countries near the equator, including the majority of Africa, South Asia, and Southeast Asia, do not observe daylight saving time at all, since day length there varies little across the year. China, Japan, India, and most of the Middle East also keep a single time year-round.
Partial Observance
DST is not always a whole-country decision. For example, most of Arizona in the United States does not observe DST while the rest of the country does, and similar regional exceptions exist elsewhere. Always check the specific city or region rather than assuming a whole country follows one rule.
Daylight saving rules are set by national and regional governments and occasionally change - several countries have adjusted or dropped DST in recent years. WorldClockify's named locations rely on your browser's built-in time zone data, which is updated to reflect current rules, so the planner should stay accurate even when a rule changes. For anything time-critical, it is always worth confirming with an official local source.
Plan Across These Time Zones
Whether you are coordinating with a half-hour offset location like India or Newfoundland, or simply need to account for a daylight saving change, the WorldClockify planner lets you add any of these locations and see how they line up with the rest of your team, right down to the current offset for the date you select.