Zulu time
Date & timeWhat time is it in Zulu (UTC)?
The current Zulu time, and any Zulu time converted to local time and back, with the day-time group pilots use.
Time to convert
What you enter stays on your device while you use this tool. Opening a shared link sends the settings in its address to HowToolbox to prepare the page.
24-hour clock, for example 1430 or 14:30. Leave empty for now.
Date and time zone
Leave empty for today.
Time in Zulu
––:––
Times and formats
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The current Zulu time, and any Zulu time converted to local time and back, with the day-time group pilots use.
How to use
- Open the page to see the current Zulu time and the day-time group, updated every minute.
- To convert a time, choose the direction and type the time as four digits, for example 1430.
- Add the date if it is not today, and pick the time zone if it is not this device's.
- Read the converted time; the details show the date on both sides, the offset and the formats to copy.
Helsinki time to Zulu on 15 January 2026
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How it works
Zulu time is Coordinated Universal Time (UTC), the one clock that aviation, weather services and shipping use everywhere, so that a flight plan or a weather report means the same moment in every country. The letter Z marks the zero time zone, and Zulu is its word in the ICAO spelling alphabet. Times are written on the 24-hour clock with four digits and a Z, such as 1430Z.
Local time is UTC plus the zone's offset: local = UTC + offset, and UTC = local − offset. The offset changes with daylight saving time, which is why the date matters. Example: 1430Z on 1 July is 17:30 in Helsinki, because Finnish summer time is UTC+3; in January it would be 16:30 (UTC+2). Weather reports and NOTAMs add the day of the month in front: 011430Z is the 1st at 14:30 UTC. Sources: ICAO Annex 5 (UTC), ICAO Annex 3 and WMO No. 306 (the METAR day-time group) and the IANA time zone database.
The current time comes from this device's clock, which can be off by a few seconds or more; it is not an official time signal. When clocks go back, one local hour happens twice and the first one is shown; when clocks go forward, one local hour does not exist at all.
Frequently asked questions
Is Zulu time the same as GMT?
In practice, yes: GMT and UTC differ by less than a second. UK local time is GMT only in winter; in summer the UK uses BST, which is UTC+1.
Does Zulu time change for daylight saving time?
No. UTC never changes; only local times move. That is why pilots and forecasters use it: a Zulu time means the same moment all year round.
What does 131430Z mean in a METAR or NOTAM?
It is the day of the month and the time in UTC: the 13th at 14:30 Zulu. The month and year are understood from the context.
How do I say Zulu time on the radio?
Say the four digits one by one, for example "one four three zero Zulu". Within the same hour, controllers may give only the minutes.
Can the UTC date differ from my local date?
Yes. Near midnight, converting to or from UTC can move the date to the previous or next day.
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