X — X-ray Time Zone
UTC-11 with no daylight saving time — view what X stands for, where it applies, and convert it to other time zones.
How to Convert X to Other Time Zones
Open the X time converter page: Go to https://www.xconvert.com/time-converter/x-time-zone to open the visual comparison tool with X-ray Time Zone (X) preloaded at UTC−11:00. This page is useful when you need to line up work across far-apart regions, such as checking whether a support handoff from American Samoa or Niue aligns with business hours in North America, Asia, or Europe.
Add comparison cities: Click + Add City and search for cities such as Honolulu, Los Angeles, and Auckland to compare X against nearby Pacific, mainland US, and Asia-Pacific schedules. This is especially practical for aviation planning, government coordination in Pacific territories, and remote teams that need to see whether a morning slot in UTC−11 overlaps with afternoon hours in Hawaii or the next day in New Zealand.
Select a time range on the grid: Click Select if needed, then drag across the X row from 9:00 AM to 11:00 AM X to highlight that window in purple; you can resize it with the left and right handles or move it by dragging the center. A concrete example: 9:00 AM in X is 10:00 AM in Honolulu (HST, UTC−10) and 6:00 AM the next day in Auckland during NZST (UTC+12), which quickly shows whether a same-day Pacific call becomes a next-day meeting for New Zealand participants.
Export and share the result: Once your range is selected, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. That makes it easy to send a confirmed meeting window to a distributed operations team, attach it to a travel itinerary, or create a calendar event that automatically displays in each attendee’s local time zone.
About X-ray Time Zone (X)
X-ray Time Zone, abbreviated X, is the military and nautical time zone designation for UTC−11:00. In the military phonetic alphabet, the letter X is spoken as “X-ray,” so “X-ray Time Zone” is simply the standardized spoken form of the UTC−11 offset used in aviation, maritime operations, logistics, and defense communication.
The exact offset is 11 hours behind Coordinated Universal Time, written as UTC−11:00. That means when it is 12:00 noon UTC, it is 1:00 AM in X on the same calendar date, and when it is 11:00 PM in X, it is 10:00 AM UTC the following day. This large negative offset places X close to the western side of the international date boundary, so date changes matter in scheduling.
X is not a civil time zone name used as the primary legal standard for major countries in the way EST, JST, or IST are. Instead, the UTC−11:00 offset is used by a small number of Pacific regions and is commonly associated with places such as American Samoa and Niue, while some systems may also show equivalent offset abbreviations such as NUT and SST depending on the region and database. Because there are no principal global metro centers in this offset, users often encounter X more in technical, military, shipping, and world-clock contexts than in consumer travel booking.
Compared with nearby offsets, X (UTC−11) is 1 hour behind Hawaii Standard Time (HST, UTC−10) and 11 hours behind UTC itself. For example, when it is 9:00 AM in X, it is 10:00 AM in Honolulu, 3:00 PM in New York during EST, or 4:00 PM during EDT, and 8:00 PM in London during GMT or 9:00 PM during BST. Those differences are important when setting customer support windows, flight coordination, or cross-ocean conference calls.
X and Daylight Saving Time
X-ray Time Zone (X) does not observe Daylight Saving Time. Its offset remains fixed at UTC−11:00 all year, so there is no spring forward and no fall back. For the current year, 2026, there are no DST transition dates for X because the time zone does not switch to any seasonal alternative.
In practical scheduling terms, this means X stays stable while many comparison zones change around it. For example, the difference between X and New York is 6 hours when New York is on Eastern Standard Time (UTC−5), but 7 hours when New York is on Eastern Daylight Time (UTC−4). Likewise, X is 11 hours behind London during GMT and 10 hours behind London during British Summer Time, so a meeting that works in January may shift by an hour in March even though X itself never changes.
This fixed-offset behavior is useful for long-term planning in maritime operations, Pacific administration, and recurring remote meetings involving non-DST regions. If you schedule a weekly call anchored in X, the local time in X remains constant every week, but participants in the US, Europe, Australia, or New Zealand may see the meeting move when their own DST rules change.
Frequently Asked Questions
What does X stand for?
X stands for X-ray Time Zone, the military and phonetic-alphabet name for the UTC−11:00 offset. In operational contexts such as aviation, naval communication, and standardized time references, letters are spoken using phonetic words, so the letter X becomes X-ray.
It is not a separate offset from UTC−11; it is simply a standardized label for that offset. You may also see regional abbreviations like SST or NUT for places that use the same UTC−11 clock time, but X is the generic military-style designation.
Is X the same as GMT?
No, X is not the same as GMT. GMT is effectively UTC±0, while X is UTC−11:00, which means X is 11 hours behind GMT.
For example, when it is 12:00 PM GMT, it is 1:00 AM in X. That large difference is especially important when planning calls between Pacific islands and Europe, because a normal business hour in London often falls very late at night or very early in the morning in X.
Which cities use X?
There are no major global principal cities officially listed under the generic X-ray Time Zone label itself, because X is mainly a standardized offset designation rather than a city-based civil zone name. However, the UTC−11:00 offset is used in Pacific regions such as Pago Pago in American Samoa and locations in Niue, depending on the time zone database and naming convention.
In practical use, people usually search by city or territory rather than by the military letter. If you are coordinating with Pacific government offices, shipping routes, or island-based operations, checking UTC−11 against your local city is often more reliable than relying only on the single-letter abbreviation.
What is the UTC offset for X?
The UTC offset for X-ray Time Zone is UTC−11:00. This means local time in X is always 11 hours behind Coordinated Universal Time.
A simple conversion example is that 6:00 PM UTC becomes 7:00 AM in X on the same date, while 2:00 AM UTC becomes 3:00 PM in X on the previous date. Because the offset is so far west, date rollover is one of the most important details to watch when scheduling.
When does X change?
X does not change during the year. There is no Daylight Saving Time in X, so it stays at UTC−11:00 in every month of 2026 and beyond unless a government or standards body changes the legal time used by a specific region.
What does change is the gap between X and other places that do observe DST. For example, if you compare X with Los Angeles, the difference is 3 hours during Pacific Standard Time (UTC−8) and 4 hours during Pacific Daylight Time (UTC−7), even though X itself remains fixed.
Is X the same as SST or NUT?
They can represent the same UTC−11:00 offset, but they are not always interchangeable in naming context. SST usually refers to Samoa Standard Time and NUT refers to Niue Time, while X is the broader military or technical designation for the same offset.
This matters when reading airline systems, operating logs, developer documentation, or world clock tools. A scheduling platform may label the offset by region, while a military or standards-based reference may label it simply as X.
How far behind UTC is X?
X is 11 hours behind UTC at all times. If it is 00:00 UTC, it is 13:00 (1:00 PM) on the previous day in X, which shows how often date boundaries affect conversions in this zone.
That previous-day effect is one of the main reasons users look up X specifically. If your company runs overnight batch jobs, satellite communications, or Pacific-region support coverage, you need to check not just the hour difference but also whether the local date has shifted backward by one day.