UTC Time
Live UTC clock (UTC+0). Free online tool — no sign-up. Clear formulas and worked examples. Mobile-friendly and privacy-first. Runs locally in your browser.
Trust summary Engine tested · Specification checked · v1.0.1
- Input interpretation
- Enter values to calculate.
- Result
- —
- Model
- Current date and time in Coordinated Universal Time (UTC).
- Scope
- Device clock and OS timezone database are reasonably correct.
- Verification
- Engine tested · Specification checked · v1.0.1
- Named expert review
- Optional · Not performed
- Specification basis
- IANA time zone database — UTC
- Coordinated Universal Time (UTC+0, no DST)
- Civil offsets defined relative to UTC
Formulas
Core equations used by this calculator.
How to use
Open the live clock
The page shows current UTC date and time from your browser.
Refresh if needed
Use Refresh to re-read the clock; the display also updates about once per second.
Convert to local time
Add or subtract the city’s UTC offset (and account for that city’s DST if any).
Example calculations
Common configurations with formula and result.
UTC noon → New York winter
EST = UTC−5
UTC noon → London summer
BST = UTC+1
UTC noon → Beijing
CST = UTC+8
UTC noon → India
IST = UTC+5:30
UTC vs selected cities (winter / no DST where fixed)
Common values at a glance.
| City / zone | Offset | Local time when UTC is 12:00 |
|---|---|---|
| London (GMT) | UTC+0 | 12:00 |
| London (BST) | UTC+1 | 13:00 |
| New York (EST) | UTC−5 | 07:00 |
| New York (EDT) | UTC−4 | 08:00 |
| Chicago (CST) | UTC−6 | 06:00 |
| Los Angeles (PST) | UTC−8 | 04:00 |
| Phoenix (MST) | UTC−7 | 05:00 |
| Bangkok (ICT) | UTC+7 | 19:00 |
| Beijing / Hong Kong / Singapore | UTC+8 | 20:00 |
| Tokyo / Seoul | UTC+9 | 21:00 |
| India (IST) | UTC+5:30 | 17:30 |
UTC Time specification
Version 1.0.1 · Engine tested
- Engine tested 3 published cases
- Named expert review Not performed
- Calculation version 1.0.1
- Definition
- Coordinated Universal Time (UTC) is the primary world time standard. The offset is always UTC+00:00 with no Daylight Saving Time. Civil time zones are defined as hours ahead of (+) or behind (−) UTC. For everyday purposes GMT and UTC both mean +0, but London switches to BST in summer while UTC does not.
- What it calculates
- Current date and time in Coordinated Universal Time (UTC).
- Inputs
- None — uses the device clock and the IANA zone UTC
- Outputs
- UTC time (24-hour style from the browser formatter)
- UTC calendar date
- Formula
Display = Intl.DateTimeFormat with timeZone UTC- Assumptions
- Device clock and OS timezone database are reasonably correct.
- Runs locally in the browser; no server round-trip for the clock.
- Units
- Civil time on the UTC scale
- Offset always +0
- Boundary conditions
- No DST transitions
- Example
- Any UTC noon maps to local = 12:00 ± city offset
- Validation cases
3 published on this page
- UTC 12:00 → 12:00 UTC
- UTC 12:00 vs Asia/Shanghai → 20:00 in Beijing
- UTC 12:00 vs America/New_York (EST) → 07:00 EST
- Specification basis
- IANA time zone database — UTC
- Coordinated Universal Time (UTC+0, no DST)
- Civil offsets defined relative to UTC
- Calculation version
- 1.0.1
Background
Interpretation and common distinctions.
Current UTC time
This page shows a live clock for Coordinated Universal Time (UTC), using the IANA zone UTC. Time is read from your browser with that zone applied.
This site’s legacy GMT URL also points here for the +0 reference — remember that London is only on GMT in winter.
What UTC is
| Name | Abbreviation | UTC offset | DST |
|---|---|---|---|
| Coordinated Universal Time | UTC | +0 | None |
Every other civil zone is written as hours ahead of (+) or behind (−) UTC. Example: Beijing is UTC+8; New York is UTC−5 in winter and UTC−4 in summer.
UTC vs GMT vs London
- UTC — fixed +0, never changes for DST.
- GMT — traditional name for +0; still used for UK winter time.
- BST — UK summer time at UTC+1.
So “GMT” and “UTC” match for everyday math, but saying “London is always GMT” is wrong from late March through late October.
How to convert
- Read the UTC time on this page.
- Look up the city’s offset (and whether it is currently on daylight time).
- Add a positive offset or subtract a negative one.
Examples at 12:00 UTC: New York winter 07:00, Beijing 20:00, Tokyo 21:00, India 17:30.
Related tools
Other calculators in this family: UK / London Time, New York Time, Beijing / China Time, Tokyo / Japan Time, India Time (IST) .
Frequently asked questions
Key distinctions behind the calculation.
What is UTC?
Coordinated Universal Time is the world’s primary time standard. All time zones are defined by how many hours they are ahead of or behind UTC. UTC itself never observes Daylight Saving Time.
Is UTC the same as GMT?
For everyday civil time, both mean offset +0. GMT is the older term tied to mean solar time at Greenwich; UTC is the modern atomic-clock standard. London uses the name GMT in winter but switches to BST in summer — UTC does not switch.
Does UTC observe Daylight Saving Time?
No. UTC stays at +0 all year. Cities may change their own offsets relative to UTC.
Why do people say Zulu time?
In aviation and military usage, “Zulu” means UTC. A time written as 1500Z is 15:00 UTC.
How do I find local time from UTC?
Add the city’s offset if it is east of UTC (positive), or subtract if west (negative). Example: UTC 12:00 + 8 h = 20:00 in Beijing.
Why use the IANA id UTC?
It tells software to display Coordinated Universal Time with no DST transitions, avoiding confusion with Europe/London which changes in summer.