The Zulu time converter is a convenient tool for quickly calculating between your local time and Coordinated Universal Time (UTC, aka Zulu). You can also use it in reverse — simply enter the time you know, and the calculator will convert it automatically without requiring any settings changes.
Are you still wondering what Zulu time is? We’re here to help! Read the article below to learn more about this topic, including its origin, how it works, and how to make a conversion manually. We have also included a Zulu time conversion chart to simplify common calculations.
What is Zulu time?
Zulu time zone is another name for Coordinated Universal Time (UTC) zone, the global time standard used worldwide. It is based on the Prime Meridian (0° longitude), which passes through Greenwich, United Kingdom. The name Zulu comes from the NATO phonetic alphabet, which assigns the letter Z (“Zulu”) to the number zero representing the UTC+0 time zone.
You can also try our NATO phonetic alphabet translator to see how the letter Z is converted into the code word Zulu.
How to calculate Zulu time: Zulu time chart
To find the current Zulu time (Z-time) manually, you need to know your local time zone and whether daylight saving time (DST) is active. Since DST rules vary across countries and regions, manual calculations can be confusing and require checking time zones around the world, which makes manual conversion error‑prone. That said, the easiest way to calculate Zulu time is to use the Zulu time converter.
However, if you want to find it by hand, you can use a Zulu time conversion chart. The table shows selected examples for time zones in the mainland United States during standard time (without DST).
Zulu time | Alaska: -9 hr | Pacific: -8 hrs | Mountain: -7 hrs | Central: -6 hrs | Eastern: -5 hrs |
|---|---|---|---|---|---|
0:00 AM | 3:00 PM | 4:00 PM | 5:00 PM | 6:00 PM | 7:00 PM |
6:00 AM | 9:00 PM | 10:00 PM | 11:00 PM | 12:00 AM | 1:00 AM |
12:00 PM | 3:00 AM | 4:00 AM | 5:00 AM | 6:00 AM | 7:00 AM |
6:00 PM | 9:00 AM | 10:00 AM | 11:00 AM | 12:00 PM | 1:00 PM |
During daylight saving time, add one hour to the affected time zones. In the United States, DST starts on the second Sunday in March and ends on the first Sunday in November.
❗ Exception: Most of Arizona does not observe daylight saving time and remains on Mountain Standard Time (MST) throughout the year.
Keep in mind that DST does not always mean adding exactly one hour. For example:
- Lord Howe Island in Australia changes by 30 minutes during DST.
- Troll station in Antarctica changes by 2 hours during DST.
Because DST rules and dates differ around the world, using our Z-time converter is a safer option to avoid mistakes.
Interested in other time formats? Our military time converter explains how the 24-hour clock works and how to convert between military time and the AM/PM format.
How to use the Zulu time converter
Our Zulu calculator supports two ways of converting time.
Zulu time by country
- Select your country from the drop-down list.
- Choose a region if the country has multiple time zones.
- Enable the daylight saving time (DST) if it is currently observed in your selected location.
- Enter either Zulu time or local time — the Zulu time converter will calculate the corresponding time automatically.
Zulu time by time zone
- Select a time zone from the list. The time zones are organized by their offset from Zulu time.
- If applicable, enable DST (marked as summer time).
- Enter either Zulu time or local time.
Our time zones converter is a dedicated tool for exploring time differences and converting between locations worldwide.
FAQs
How do I convert Zulu time to EST?
The Zulu time to Eastern Standard Time (EST) relation is the following:
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Subtract 5 hours from Zulu time (UTC) to get EST.
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This is expressed in:
EST = UTC - 5 hours
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In the daylight saving time period, subtract 4 hours instead to get Eastern Daylight Time (EDT).
You can use an online Z-time converter for quick Zulu time calculations.
How do I convert Zulu time to CST?
To convert Zulu time to Central Standard Time (CST):
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Subtract 6 hours from Zulu time.
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The formula is:
CST = Zulu time − 6 hours
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To account for daylight saving time, subtract 5 hours instead. This is Central Daylight Time (CDT).
Zulu time is the same as Coordinated Universal Time (UTC).
How do I convert Zulu to mountain time?
Subtract 7 hours from Zulu time to get Mountain Standard Time (MST) or 6 hours to get Mountain Daylight Time (MDT). The latter accounts for daylight saving time.
Most of Arizona is an exception because it stays on MST year-round and does not observe daylight saving time.
What is Zulu time in PST?
The time difference between Zulu time and Pacific Standard Time (PST) is 8 hours, subtracted from the former. This is expressed in the following formula:
PST = Zulu time − 8 hours
This difference reduces to 7 hours during daylight saving time — Pacific Daylight Time (PDT).