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Military Date/Time Group Explained

Monday, March 13th, 2023

The military Date Format and Date Time Group (DTG) is used by the military in everything from operations orders to airlifts. It is essential for every service member to know how to put together a DTG format properly.

Why? Because you have to have a consistent timing system utilizing specific datum if you’re coordinating operations (especially joint and combined) in every time zone on earth. This can range from ensuring several attacks kick off at the same time to making sure you’re available for a phone call at the right moment.

Closeup of Members of Provincial Reconstruction Team Farah visit Vocational School showing watch: explaining the Date Time Group and Military Date Format.

Date Time Group

The military date format (Date Time Group/DTG) , used for communications messages timestamp, coordination, and implementation, is traditionally formatted as: D D H H M M (Z) M O N Y  Y

Here’s an example. You receive a message to report to a certain location:

630pm on January 6th 2012 in Fayetteville, North Carolina (United States). These time values would read: 061830RJAN12

DD-Day of the month (e.g. January 6th=06)

HHMM- Time in 24 hr format +military time zone (e.g. 6:30pm in =1830).

Z- Military identifier- see below for a complete list

MON- 3 digit month code, (e.g. January= JAN) (*using military three letter month abbreviation)

YY- 2 Digit year, (e.g. 2012= 12)

DDHHMM(Z)MONYY

DD/Day =06 • HHMM/Hour Military Time Zone= 1830 • Z/Time Zone=5 (US Eastern Standard Time) • MON=January • YY/Year=2012

 

The Date Time Group (DTG), often referred to as the Army DTG (though it's for all of DoD and other entities) is a crucial part of the Military Date Format.

The Date Time Group (DTG), often referred to as the Army DTG (though it’s for all of DoD and other entities) is a crucial part of the Military Date Format.

 

Date Time Group: Military Time Zones

The military time zone is used as a representation to Coordinate Universal Time (UTC). Universal Time is based on hours plus (+) or hours minus (–) Greenwich Mean Time (GMT). GMT is considered Hour Zero (0).  In military time code reference, Greenwich Mean time is called Zulu (Z).  In operations spanning multiple time zones, Zulu will be used to give all operating units a time zone to adjust their time to so that everyone is on the same page.

One common mistake when using the military time code is to use “L” as Local time.  In fact, “L” represents the time code for Coordinate Universal Time (UTC)+11, which covers parts of Russia and Australia.  When referring to your time zone, see your local code identifier by using the reference below.

 

Military Date Format

Military Time Format Letter Reference

Time Zone Suffix

Time values are determined by adding or subtracting the number of hours indicated by a specific time zone to or from UTC.

UTC -12: Y- (e.g.  Fiji)
UTC-11: X (Nome Alaska)
UTC-10: W (Honolulu, HI)
UTC-9: V (Juneau, AK)
UTC-8: U (PST, Los Angeles, CA)
UTC-7: T (MST, Denver, CO)
UTC-6: S (CST, Dallas, TX)
UTC-5: R (EST, New York, NY)
UTC-4: Q (Halifax, Nova Scotia
UTC-3: P (Buenos Aires, Argentina)
UTC-2: O (Godthab, Greenland)
UTC-1: N (Azores)
UTC+-0: Z (Zulu time)
UTC+1: A (France)
UTC+2: B (Athens, Greece)
UTC+3: C (Arab Standard Time, Iraq, Bahrain, Kuwait, Saudi Arabia, Yemen, Qatar)
UTC+4: D (Used for Moscow, Russia, and Afghanistan, however, Afghanistan is technically +4:30 from UTC)
UTC+5: E (Pakistan, Kazakhstan, Tajikistan, Uzbekistan, and Turkmenistan)
UTC+6: F (Bangladesh)
UTC+7: G (Thailand)
UTC+8: H (Beijing, China)
UTC+9: I (Tokyo, Australia)
UTC+10: K (Brisbane, Australia)
UTC+11: L (Sydney, Australia)
UTC+12: M (Wellington, New Zealand)

Garmin explains it thusly;

“Military time is very similar to 24-hour time, but there are two differences between military time setting and 24-hour time setting. Military time uses a leading zero and doesn’t have a colon, while 24-hour time uses a colon but not a leading zero. For example, 8 o’clock AM is shown as 0800 in the military and 8:00 in 24-hour time. 8 PM would be 2000 (military) and 20:00 (24-hour).”

This article was originally published in 2012. 

Seiko Kinetic Cal. 5M85 GMT Diver’s Watch

Monday, May 23rd, 2022

As soon as I saw the Seiko Kinetic watch for the first time, I was instantly attracted. The bezel, face, and case combination are striking, and I’ve always been a fan of rugged dive watches.

Seiko Kinetic with Tactical Gear

A good timepiece should be part of your Every Day Carry, regardless of your occupation.

The “Padi”  Seiko Kinetic has a stainless steel case that is 47.5mm in diameter and 14mm thick. Needless to say, this is a substantial “tactical watch,” and it is not lightweight, either. However, the case has an interesting design, as it comes up around much of the bezel and shields it, creating a sort of protective barrier while still allowing the wearer to access the bezel to manipulate it.

Seiko Kinetic watch face

The PADI’s colors and design are eye-catching. It’s just interesting to look at!

Also, rather than being square, the case is tapered, giving it a streamlined look and feel, which is a pleasant departure from how most dive watches are designed. Finally, the stainless case has a brushed finish, giving it a sort of matte finish that is pleasing to the eye. Another interesting aspect of the case is that there are cutouts on both sides with “windows” that allow you to look inside the watch.

Side view of the Seiko watch

Side view shows the windows cut out in the case, as well as the crown and button to check the charge level. The case partially protects the bezel.

Left side view of Seiko Kinetic watch

There is a large window cut into the left side of the case.

 

Back view of the Seiko watch

The back of the case contains the model number and other watch information.

The crown is of the screw-down variety and is easy to operate, being located at the three o’clock position. Just above that is a button that, when pushed, indicates the power reserve level. Speaking of power, the watch is powered by kinetic energy. In simple terms, each time the watch moves, such as when you’re wearing it, it operates a rotor, which charges an onboard battery. It’s a neat aspect because you can actually feel and hear the rotor operating if the room is quiet. When fully charged, the internal battery’s charge will last for approximately six months. In addition, there is a feature to indicate that the battery is low; the second hand will move at two-second intervals. Beyond that, the movement is quartz, which contributes to accuracy.
The PADI Seiko Kinetic diver has a bezel that rotates in one direction so that if you’re diving, it won’t accidentally move in the wrong direction, which could give a diver an erroneous dive time. That could prove fatal. PADI stands for Professional Association of Diving Instructors, in case you were wondering, and Seiko partnered with them to develop this watch.
The bezel is marked by numbers and is black, which contrasts nicely with the blue face of the watch. The outer portion of the bezel has scallop shapes cut into it, which really gives the fingers a positive purchase when manipulating the bezel.
The number marks on the face of the watch are luminous, as are the hour, minute, and second hands. The luminescence is pleasingly bright and lasts for hours, and is among the best of any of the watches that I’ve ever owned. As mentioned, it’s a dark blue background, and there are red hash marks at the 12, 3, 6, and 9 o’clock spots, which adds a nice dash of color and makes the watch face that much more interesting.

watch face on a human wrist

This Seiko Kinetic, and not lightweight! The band keeps it in place well.

There is a date window between four and five on the face, and it fits in there unobtrusively.
Additionally, there is a GMT feature, so you can set the GMT hour hand for a different time zone if you desire. This particular hand is red, adding more color to the watch face.
This watch is rated for 200 meters, or 660 feet, making it a SCUBA diving-rated watch. There’s no doubt that this watch is up to just about anything you can throw at it in an aquatic environment (and pretty much any environment). These days, divers mostly use dive computers, but it’s always helpful to have a precision watch as a backup to the computer.
To keep the watch securely on your wrist, there is a thick, black silicon band that works very well. The buckle and keeper are stainless steel and very robust, so there’s little chance of ever having issues with it not being durable enough.

underside of watch band

The hardware on the band is stainless steel and extremely sturdy! The band is a black resin, which is firm, yet pliable.

The face of the watch has a sapphire crystal, so it’s incredibly durable and not likely to scratch. So far, despite the bangs and bumps that I’ve put this watch through over the last couple of years, there are no scratches or chips in the crystal. So it’s good to go!
All in all, this is an extraordinary timepiece that is highly durable and looks spectacular. The case and dial, combined with the bezel, all meld together to create a somewhat unique look, which says quite a bit in this market saturated with dive watches. This one is just different enough to make it stand out. Be advised that it is not a lightweight watch; this one does have a bit of weight to it. That said, the band does keep it secured on the wrist well. Whether you want a watch for going into the depths or just a timepiece that looks fetching, the Seiko Kinetic PADI limited edition will be a great choice!

About The Author:

Jim Davis served in the PA Dept. of Corrections for 16 ½ years as a corrections officer in the State Correctional Institute at Graterford and later at SCI Phoenix. He served on the Corrections Emergency Response Team (CERT), several of those years as a sniper, and also the Fire Emergency Response Team (FERT). For 25 years, he was a professional instructor, teaching topics including Defensive Tactics, Riot Control and Tactical Operations, Immediate Responder, and cognitive programs as an adjunct instructor at the DOC Training Academy. He was then promoted to the title of corrections counselor, where he ran a caseload and facilitated cognitive therapy classes to inmates. His total service time was close to 29 years. He was involved in many violent encounters on duty, including incidents of fatalities.

Smith & Bradley SANS-13 2.0 Watch is the lead prop in upcoming film ’10 MINUTES GONE’

Monday, August 19th, 2019

As the title states, the Smith & Bradley SANS-13 2.0 is the lead prop in the upcoming film ’10 MINUTES GONE’, staring Michael Chiklis and Bruce Willis. According to Jerommie Smith, the president of Smith & Bradley, S&B worked directly on set and made all the prop watches in the film, which are featured in a shot in every scene.

You can check out the trailer for ’10 MINUTES GONE’ below:

G-SHOCK X Transformers – Optimus Prime

Friday, November 23rd, 2018

The G-SHOCK X Transformers Optimus Prime is a collaboration between Casio Japan and toy company Takara Tomy. It consists of a collectable Optimus Prime figure which stows a color-matching G-SHOCK 6900 watch within its chest cavity. The figure transforms into a pedestal for the watch to remove it, which can be replaced with Optimus’ Matrix of Leadership – known as the Chrono Matrix for this figure.

This set is a Japanese-exclusive release, and is retailing for approximately 250 USD.

tf.takaratomy.co.jp/products-lineup/mall_ex/gsh_rnm

The Official Dick Tracy Watch On Indiegogo

Saturday, June 23rd, 2018

Ivory & Horn, a company formed by two brothers, has started an Indiegogo campaign for an officially licensed Dick Tracy Ivory & Horn did produce a Dick Tracy watch back in 2016, however its function was purely as a watch. This 2018 model is not only a watch, but also features a Bluetooth-enabled speakerphone, meaning it functions much like the actual watch from the Dick Tracy comic strip. You can check out the entirety of the details and features via the below image:

Regarding the availability: they’re planning on making only 1000 units available upon successful funding. Given it’s a pretty niche product, that makes sense, but if you want to get one for yourself, you’d best fund now rather than later.

https://www.indiegogo.com/projects/dick-tracy-the-official-watch-bluetooth-watches–3#/

Lifeclock One – Escape From New York Inspired Smartwatch On Kickstarter

Tuesday, November 1st, 2016

It’s no secret that Escape from New York is one of my absolute favorite movies of all time. So much so that I’m still constantly on the lookout for related memorabilia, collectables, art, and the like. That’s why the Ridgewood Watch Company’s Lifeclock One has caught my interest, as it is an officially licensed reproduction of Snake Plissken’s countdown watch from the aforementioned movie, modernized into a multi-function smartwatch.

lifeclock

The Lifeclock One consists of a main enclosure CNC machined from a solid piece of brass with a stainless steel backplate. The LEDs utilized within the Lifeclock are 11 segment custom displays made specifically for the watch. The strap is made of leather, and is being offered with either Velcro (like in the movie), or a more traditional buckle attachment. The Lifeclock will also be Bluetooth enabled, and capable of of integrating with a smartphone, as well as function as a standard watch, stopwatch, compass, and more.

Perhaps the only real grey spot about the Lifeclock One is this: it can be considered pretty darn pricey. The “Early Backer Edition”, already priced at $249, is sold out at the time of writing, with the next least-expensive tier starting at $399, and the final tier as high as $799.

On the other hand, the Lifeclock One does feature high-quality components, and although it doesn’t fully meet the FTC’s guidelines to be considered a fully ‘Made in USA’ product, the main enclosure and core printed circuit board are US-manufactured, and the completed watches will be assembled, tested, and distributed from the state of Georgia.

So, if the price point isn’t too daunting, and you like what the Lifeclock One has to offer, then feel free to support Ridgewood Watch Company’s efforts on their Kickstarter campaign.

www.kickstarter.com/projects/jonathanzufi/lifeclock-one-the-escape-from-new-york-inspired-sm

Nixon Watches – Star Wars Collection – Boba Fett

Monday, March 7th, 2016

Nixon Watches has released a collection of Star Wars-themed watches and accessories. As is usual, I’m focusing largely on the gear themed after the galaxy’s most feared bounty hunter, although Nixon’s offerings extend to other themes, such as R2-D2, Darth Vader, and Stormtroopers, as expected.

C2542SW-2248-view1

A-10 Backpack

The A-10 Backpack is a top loading pack made of distress PU coated canvas, in a colorway resembling Boba Fett’s outfit. The main storage compartment features zipper closure and internal organization, and the pack also sports two vertical front accessory pockets, a side entry laptop compartment, and stretch mesh side pockets. Plus, it comes with a Han Solo in carbonite zipper pull.

www.nixon.com/us/en/a-10-backpack-sw

A506SW-2241-view1

Ranger SW

The Ranger SW watch, in ‘Boba Fett Red / Gray’, features Miyota Japanese quartz 3-hand movement, and a 44mm, 10 ATM custom stainless steel case. Additional features include a unidirectional stainless steel bezel, a date window at 6 o’clock, and maroon metallic anodized aluminum bezel inlay with orange Boba Fett kill stripe detailing.

www.nixon.com/us/en/ranger-sw

G-Shock – GD-120CM-5ER

Saturday, March 8th, 2014

img_435699

As part of the new 2014 camo collection from G-Shock, the GD-120CM-5ER features a special, military-style camouflage print. Water resistant up to 200 meters, with quartz digital movement. Capable of 12/24 hour format, with an onboard alarm, calenar, stopwatch, and LED light.

Also available in ‘red/black’ and ‘grey/dark grey’ camouflage prints.

Available from Klepsoo.

DRx Bamford – Army Vs. Navy Watches

Wednesday, June 13th, 2012

Famed “cultural clothing alchemist” Dr. Romanelli and Bamford Watch Department have partnered up to release the Army Vs. Navy Rolex collection, featuring iconic characters Beetle Bailey on a Submariner and Popeye the Sailor on a Yachtmaster. Both watches come in a special carrying case marked as ‘Army Supplies’ or ‘Navy Supplies’, for Beetle and Popeye respectively, and included with the watch is a custom comic strip true to the property.

Just One Eye – $24,490

Just One Eye – $32,390 (Out Of Stock)

http://drromanelli.com/blog/art/drx-bamford-army-vs-navy-release

Vannen Walkers 2.0 Watch

Saturday, June 9th, 2012

Vannen has released the ‘Walkers 2.0’ watch, which features imagery from Robert Kirkman’s highly successful graphic novel series ‘The Walking Dead’. It features a 43mm matte white plastic case, 22mm wide, sandwich style strap, and 3 hand Japanese quartz movement; nothing tactical about this watch folks, just something fun to own.

The ‘Walkers 2.0’ is limited to 600 pieces and the packaging is signed by Kirkman so it could be considered a collectable. Also of note is the watch is water resistant up to 10 meters, although Vannen still recommends keeping it away from water.

You can purchase one at vannenwatches.com – Walkers 2.0

CES 2012 – G-Shock GB-6900

Friday, January 13th, 2012

Casio’s latest offering in the G-Shock line of watches is the GB-6900. It’s the first in the line to use Bluetooth Low Energy Wireless Technology, which is really Newspeak for this thing will be studying your daily habits to better plan the eventual machine takeover. All joking aside, it’s a pretty useful bit of hardware.

It connects to most smartphones to automatically adjust and correct its own display time and includes an alert signal that notifies the user of incoming calls and messages. Any ring alerts and vibration can be stopped by tapping a button on the watch. Similarly, phone alarm and vibration functions can be activated with a button press if the phone is misplaced. The Bluetooth signal features a data transfer rate is abound 1 Mbps with a signal range of 2m and a 128-bit Advanced Encryption Standard.

As a watch, the GB-6900 isn’t too shabby either. It has five independent daily alarms, a stopwatch, countdown timer, and display options for 35 time zones in 100 cities, including Coordinated Universal Time and the option to enable Daylight Savings Time. Like other G-Shock models, it has a shock-resistant body and is rated for immersion up to 200 meters of water. A battery life of approx. 2 years is provided by a single CR2032 disk battery, assuming the communication function is used for only 12 hours per day. It’ll be available in Japan in March. The USA, and presumably everyone else, will get it by the end of the year.


http://www.gshock.com/

0’Clock Camo Watches

Monday, November 7th, 2011

The 0’Clock Watches are Italian-made time pieces with a simplified design: the clock face features no numbers and has a Woodland camo design. What they lack in detail they make up in customization. The time piece is easily removed from its silicon band and can be placed in similar bands of varying colors and sizes. Each 0’Clock watch also comes in a sealed can with a pop-top lid, an amusing feature that mimics opening a can of food. 0’Clock Camo Watches can be purchased from Tactical Distributors.


Tacticaldistributors.com – 0’Clock Watch

http://www.oclock-usa.com/

“Son Of A Gun” Watch

Tuesday, September 27th, 2011

It just so happens that a large number of high-end watch collectors also love firearms. To celebrate this trend, Yvan Arpa for ArtyA introduced the first in a collection of firearms inspired time pieces, the “Son of a Gun” watch. Within a Stainless steel grade 316 case is the bezel and inner dial which looks like a target sight while the body contains six actual 6mm Flobert bullets wrapped in copper wire. Three .38 Special cartridges comprise part of the back plate. The watch also features ballistic style straps and is water resistant up to 50 meters. No word on pricing, but something this stylized can’t run cheap.

artya.luxuryartpieces.com – “Son of a Gun” Watch

Urwerk UR-1001 Zeit Device

Wednesday, August 31st, 2011

I’ve said before I’m a sucker for a good-looking watch, but the Ur-1001 Zeit Device practically transcends such a simple description. Beneath the sleek exterior made from non-magnetic ARCAP alloy lies indicators for all manner of measurements. It features and/or tracks satellite hours, retrograde minutes, a day/night indicator, running seconds, a power reserve indicator, a revolving satellite calendar displaying months plus date, an oil change indicator, a 100-year indicator and a 1000-year indicator. That’s right, it’s very easily designed to outlive any potential owners simply by how long it’s meant to track time. The cost? Roughly 430,000 USD. Is it limited edition? You better believe it: only 8 are available for purchase, starting in October. At that price and rarity, it was obviously meant for men with riches far beyond what most of us have available. Just the same, if given the chance to own one of these I think I’d still stick with my G-Shock. I feel it’s more functional and since it’s digital I don’t have to wind it.

urwerk.com – UR-1001

Porsche Design P’6520 Compass Watch

Monday, August 1st, 2011

I’m a sucker for a good-looking watch, even more if it’s limited edition, and the P’6520 Compass Watch fits that bill nicely. Based on an original design created by Professor Ferdinand Porsche in 1978, the P’6520 is constructed from lightweight, Black-PVD coated titanium. In addition to its sleek, all-black look, the watch features a flip-up dial that reveals a removable compass, giving it a bit more functionality beyond just a timepiece. The sad news, it’s limited to just 911 pieces. Combine that with the cost of anything from Porsche Design brand and you’re looking at spending a pretty penny.

Hat Tip: http://www.acquiremag.com/style/watches/porsche-design-p6520-compass-w.php

http://www.porsche-design.com/international/en/

No Fossil Meta Watch For You (Until August)!

Friday, July 15th, 2011

These are the the Fossil Meta Watches, a pair of hi-tech timepieces, either in analog/digital hybrid or full digital with a larger memory-in-pixel LCD, that use Texas Instrument’s CC2560 Bluetooth radio to allow the user to access their email, check weather forecasts, and Facebook updates, among other features. Too bad they won’t be out until next month. This news came straight from Bill Geiser, vice president of Fossil Watch Technology, himself in response to a tweet by a curious customer. The delay is a shame, but either Meta Watch is cool enough to warrant the wait.

Hat Tip: Engadget.com

Casio G-Shock X-Large Military Play Set Limited Edition Watch

Thursday, July 7th, 2011

With its mix of olive drab, coyote and khaki coloring, the G-Shock Military Play Set LE Watch looks very much like a tactical watch, and its ruggedness and large volume of features help to further this claim. The Military Play G-Shock is shock resistant, water resistant up to 200M, features a high-intensity LED and a large digital display area. Its powered by a CR2025 battery with an approximate life of 7 years. It can be programed to display up to four different cities’ times, from a list of 48 cities spanning 31 time zones, with city code display and full DST support. Additionally, this watch also features 5 independent alarms, a stopwatch that measures down to 1/100th of a second, a countdown timer that measures down to 1/10th of a second, and a full auto calender (pre-programmed until the year 2099). Of course, it can also display local time in either a 12 or 24 hour format that is accurate to within +/- 15 seconds per month.

And before you ask, yes. You also get the cool G-Shock action figure as part of the package.

Available exclusively* through Tactical Distributors

*in regards to tactically inclined retailers