World Clock

About this tool

Keeping one eye on Phnom Penh and another on Sydney, London or Los Angeles is daily life for anyone whose work or family spans time zones. The world clock shows the current time in ten fixed cities at a glance — Phnom Penh, Singapore, Hong Kong, Tokyo, Dubai, London, Paris, New York, Los Angeles and Sydney — each card carrying an analog face, the local date, its UTC offset and how far ahead of or behind Cambodia it sits at this moment. Cambodia anchors the grid: ICT is UTC+7 and the country does not observe daylight saving, so each city's label changes only when that city moves its own clocks. The offset is computed for the current date, so New York reads UTC-5 in winter and UTC-4 during its daylight saving without anyone having to remember the rule. This is a glance tool, not a planner: it says what time it is right now, not what time a future meeting will be. When you do settle on a date, the Cambodia holidays calendar and the working days calculator show whether that week is actually a working week in Phnom Penh.

How it works

Ten hardcoded cities and one live clock: the CITIES array in world-clock-client.tsx maps each city to an IANA zone name, and the component reads a fresh time from the device clock every second. Each card's time, date and offsets are produced by the browser's Intl.DateTimeFormat (format-date-time-khmer.ts: formatTime, getTimezoneOffsetLabel, formatRelativeToCambodia) — the same tz database the browser ships with, so daylight saving for London, Paris, New York, Los Angeles and Sydney is applied by the runtime, not by a lookup table on this page. The relative label (for example +3) compares each city's current offset with Phnom Penh's constant UTC+7 and is therefore correct for the current date only. Analog faces always use 12-hour hands; the digital readouts follow the 12/24-hour toggle. Like the timezone converter, this clock is device-based, not server-synced.

Use cases

• A Phnom Penh remote team with colleagues in Singapore, London and New York checking a shared working-hours window at a glance.
• A Cambodian student in Sydney checking whether it is a reasonable hour to call family in Phnom Penh before dialing.
• A Siem Reap travel agency confirming current local times across Dubai, London and Los Angeles for clients on long-haul itineraries.
• A Khmer diaspora family coordinating a Sunday video call across California, Paris and Phnom Penh without converting anything.
• A freight coordinator in Phnom Penh aligning with Hong Kong and Singapore offices inside the port operating window.
• A journalist covering ASEAN markets reading Tokyo, Hong Kong and Singapore times against regional market hours.

Frequently asked questions

• Does Cambodia observe daylight saving?

  No. Cambodia uses Indochina Time (ICT, UTC+7) all year and never shifts its clocks. The only changes you will see on this page come from the cities that do observe daylight saving — London, Paris, New York, Los Angeles and Sydney — and their cards update automatically when those regions shift.

• Can I add a city that is not on the list?

  No. The list is fixed at ten cities — Phnom Penh, Singapore, Hong Kong, Tokyo, Dubai, London, Paris, New York, Los Angeles and Sydney — with no search field and no add-your-own option. For zones outside the list, use the timezone converter, which also includes Bangkok, Shanghai and UTC.

• Why does the New York card change its UTC label during the year?

  The page computes every city's offset on the current date from the browser's timezone data. New York is UTC-5 during standard time and UTC-4 while US daylight saving runs, roughly mid-March to early November. Cambodia stays at UTC+7, so the difference shown also changes with New York's shift.

• Is this clock synced to a time server?

  No. The times come from your device's clock, formatted per city with the browser's timezone database. If the device clock drifts, every city on the page drifts with it. It is a convenience display, not an NTP-grade reference clock, and it should not be used to timestamp anything.

• Why are the analog hands always on a 12-hour face?

  Analog clock faces conventionally show twelve hours, so the hands are always 12-hour regardless of the format toggle — the note under the toggle says so. The digital time below each face follows your 12/24-hour choice, which is why the digital readout can differ from the hands.

• Which cities on this page never change?

  Singapore, Hong Kong, Tokyo and Dubai do not observe daylight saving, so their offsets are constant year-round. London, Paris, New York, Los Angeles and Sydney do shift, and their cards update automatically. Cambodia, at UTC+7, is the fixed reference the whole grid is measured against.

• What is the difference between the world clock and the timezone converter?

  The world clock answers "what time is it right now in these places" for ten fixed cities, with no selection needed. The timezone converter answers "what time is it in X when it is Y here" for any pair from its twelve-zone list, and the chosen pair can be shared through the URL.

Data and accuracy

Content last reviewed 19 October 2026