Why do I need this on a Chronograph? 😑 

Believe it or not, I love having the 24hr reading as it helps me see how far I’m throughout the day. “Oh I’m 60% through today”

It’s super helpful when setting your watch with a date. Otherwise you need to turn until the day change to know you are at midnight.

Disagree! If you’re stuck in a bunker, how can you tell the time is a.m. or p.m.?

What about being a degenerate gambler and want to know if it’s day or night, not that it matters since the next shoe is looking hot so you’ll win it all back.

Same reason for why we still use analog watches, it gives us a visual representation of time

My man dropping amazing videos left and right!

It's nice to know when the date/day is going to flip if youre setting it and dont want to roll through the whole month/week

I actually like the 24 hours dial because it gives me a sense of the day as a whole, like how much did i have left to enjoy or how much I have used. Don't know how to explain better, it is just a emotional perspective about seeing the full day going away

The 24 hour hand can also be used as a compass. Holding the watch flat, have the regular hour hand point to the sun, the 24hr hand will point to north. Works only if its not DST time.

24 hour scale is not useless ! it allows wearer to know if they are long time stuck in a mall or indoor environment or a cave etc.... to know it is day or night , which is the same as a SUN/Moon disc.

24 hour face makes it really easy to set up time on a watch with a date 🙂

Glad you made a video on this complication. I 100% agree with your statement. There’s not that many people in Alaska with Seiko’s, the market is small for that. I wish they had put a hour totalizator instead of the 24 hour one, that would be a lot better.

I can imagine that many a young doctor stuck inside a hospital for a 30 hr shift, in an environment where everything is documented in the 24hr format, would find this feature useful.

Traveling, places like Alaska, jobs where you don't get to see the sun often, I'm sure there are others I'm missing

Chronograph watches need that 24 hour feature, itself allows easier setting up of time & date by their own.

if you live on the ISS, you actually go thru multiple time zones very fast so yes, this could be helpful for those orbiting the Earth too lol

As someone who does data entry and has to put everything in 24 hour format, it can be a nice little feature. The times between 1500 and 1800 somehow screw with me periodically, so the watch makes a great reference when I check times on paperwork.

Medical work, we use 24hrs for documentation

As a person living in Canada, this ain't so useless. Come on man, think international, meaningless for you isn't the same for everyone else.

All of our vehicle tracking and work calendars docs need to be filled in 24 hr time. Def makes it easiers for some of our people.

Tachymeter on a chronograph is completely useless too.

You can also add oncall radiologists (they spend in dark rooms always) and surgeons especially during oncalls (they won’t see sunlight)

A day has 24 hours, so the real question is why aren't 24h dials mainstream. Wherever it's possible, I always set 24h scale. It's not "military time", it's homo sapiens time.

My speedmaster mk40 has a 24h sub dial, one half is painted in a lighter shade of blue so you know that’s the safe zone for adjusting the calendar without breaking the mechanism. So I guess most chronographs have it because of that

When adjusting the date the 24h indicator comes handy to know if he is in AM or PM so that the date doesnt change noon time by mistake

The AM/PM is needed when you don't use the watch for long and wind up the spring to full and set time. Now the problem lies after this while setting up date. For example the clock stopped running 4' O clock and now I reset the time to let say 2'o clock in the afternoon but I don't know whether it's 2PM or 2 AM that my watch is set to. This will eventually lead to wrong update of date and day after few hours. It could be that I am expecting the day date to change after midnight but my watch didn't instead it changed date day in 12'o clock afternoon

At my place. 6pm and 6am looks the same. Though.

Considering that the rest of the world uses a 24hour clock....... think young brother

Probably for Le mans because it's a 24-hour race and I know people take shifts but I think it's still keeps it handy for 24 hours lol

as someone who had to serve in the command operations room on a 24 hour shift during my mandatory conscription National service, I can tell you that it was beneficial to know considering i'm inside the damn room for the whole period and there's no windows or natural light entering the room to tell you if it's morning or afternoon.

I think that just in general, 3 dials on a face can be an aesthetically pleasing feature to look at in terms of balance, and when you look at a lot of countries where the number 3 is considered lucky, and has significant meaning, sometimes you just need something so simple yet so important for a special wrist piece for it to stand out even among other watches.

It's 100% for pilots. It's the same reason the GMT watch makes so much sense for us. We hop time zone so often, show all of our flights are set off of UTC or as it used to be, GMT. There are also industries that work exclusively in a 24-hour time scale. It's not common, but it does exist. Finally, some people just like the oddity.

You are wrong. 24hrs scale is a useful in everyday use. It is used in transportation, and logistics to clearly indicate when something is scheduled for arrival, delivery, departure. Communications use it in a professional setting to better indicate the start and end of an event such as a special report, a news broadcast or standard daily programming, the military use it for accurate operation timetables and obviously everyday time keeping. The most useless complication is a perpetual calendar in an automatic/mechanical because if the watch stops running for several days it is a total pain to reset. Leave that sort of compilation to digital watches like GShock and stick with the tried and true standard day and date calendar complication.

Suddenly EVERYONE’s a spelunker 🙄

How about a submarine sailor. Surely he would like to know if it’s morning or night on the surface !

This is silly. Why do you need the 24 hour scale? Because it's there!

I work in power and every hour of the day is identified by “Hour Ending”, i.e. 4:25 pm would be in Hour Ending 17. A 24 hour watch allows for a very quick reference to what hour we are currently in which can be useful, especially to those new to the industry.

Why you hating kuys? This definitely helps a lot of hard working people with graveyard shifts - using military time - pilots and people that value every second , minute & hour.

When a watch is wound down, to me it’s very useful to find out if it’s in the “danger zone” to change the date. Plus there are so many aesthetic things you can do with a 24 hour dial, like symmetrical dials and moon phases.

The only time i think a 24 hour timer is useful would be if you lived near the poles where daylight is longer than 12 hours, work on a submarine or something else that doesn't let you see daylight for a while. Beyond that, its useless to many people, and imo, the argument it helps set up the day/date is pointless. It only takes maximum of two rotations to know when it shifts to the next day.

Ampm or 24 hour mode is useful in a military situation fighting in an underground facility.

As a flight attendant, I need the military time. 😊

Seeing as how the SSC813/819 is one of my favorite watches, I really do wish that 24hr sundial was used for something more useful.

Iam a Musician/singer. There are times where i get inside studio and work 40-60 hours. I cannot see sunlight/moonlight to determine if it’s AM or PM

Cause it's dangerous to change the date/date on automatic watches bewtween 9pm and 3am. The gears are active during that time. You can damage to the movement and breaks the day and date wheel by doing that.

In Europe for example AM/PM doesn’t exist. We use 24hr.

In the summer from 6 to 8 its also useful in the northern hemisphere

I heard you can change the 24 hr setting and it runs independently of what ever time is set on the watch. That can be useful.

I think it's more important when you get kidnapped and lay around in a dark room or get lost in a cave or something

Hidden features of Chronograph watch subdial that has 24, 4, 8, 12, 16, 20 markings; If you take your watch off align the little dial towards the Sun you will get compass directions. 12 o'clock is always North. It's a rudimentary way of finding out cardinal directions for your surroundings if you were lost.

I adore a GMT or solar dial watch because it keeps track of your most valuable resource: The time within your day!

Well for the Seiko as it is made in Japan that function is useful as the 24-hour time is used here.

Stuck in a cave. What time is it? Thats why you need a 24 hour analog gauge. On my watch ⌚️ its one of the last features to stop if I dont have a light source.

I imagine for military or cops it’s useful as well. But then again they’re probably wearing gshock, not seiko

Having worked in healthcare settings for my career, 24 hour time is used in hospitals and clinics to avoid confusion with treatment, medication, and diagnostic testing. I absolutely prefer this feature when I buy watches.

You’re right, the only time I even look at it is when I’m changing the date and setting the watch

The 24 hour dIl helps with setting the date.

It’s a 24 hr timer n a chronograph stopwatch feature. For timing of long distance events like endurance motor racing, like the watch was invented for - with its tacho ring - not to tell you if it’s night or day.

Perhaps the only other useful aspect of a "fixed" 24h subdial is making it a tad faster to set a day/date complication, where you instantly know whether or not you're in the "safe zone" for changing the day and/or date. Other than that, yeah, rather pointless.

I hate it when they put an elapsed time bezel on a chronograph. Like… why? A chronograph already measures elapsed time. Put some other function on the bezel like a countdown or hours or something.

it exists because the vast majority of the world does not say the time as 1AM or 1PM but would say 1 when its 1AM and 13 when its 1PM

Date, Power Reserve & GMT are indeed useful complications. I do not think any other complication is of any real use.

100% agree. As I am looking for a good chronograph with a 12-hour totalizer, it drives me crazy that 90% of chronographs waste one of their subdials on this useless feature.

Bro asked for AM or PM when the sun of shinning brightly behind him

It’s a clue for those who need it as to whether the date changes at the right time.

The 24-hour dial has nothing to do with tracking secondary time zone or GMT. It does not operate separately from the hour hand. It’s just a n AM/PM indicator and nothing more.

I believe it's for blind people because they don't know it's day or night

Military time is a little easier with the 24 hour dial if your not too familiar at first 😅

The 24 hr timer is a useless sub dial.

it is there to fill the space. date window is annoying to have to adjust every 2 months

It’s called military time. Makes it a little faster when someone tells you to be there at 1720.

I don't mind as long as the watch looks good , like the seiko speedtimer

Ever heard of Le Mans ? It’s a 24 hour endurance Motor Race in France 🇫🇷 where NO ONE will give foreigners the time of day !☠️😎😎😎

I would really prefer if the 24hr time was settable to any time so it acts like a mini GMT

Here’s another reason why it’s actually useful: if you haven’t used that particular watch in a while, you need to wind it and maybe set the date agains however, if it’s towards the evening and it’s let’s say 11 pm, you cannot change the time as it will damage the mechanism. So if I know it’s 11 am, I can change the time and date without worrying. Don’t get me wrong, it’s not an excuse to pay more for a chrono but it is another useful reason😂

For me, power reserve is very useful for a manual watch because it shows if it needs to be wound. On an automatic, not really

You're quite right. But what I hate most is a watch with short hands, especially the minute hand like CASIO EDIFICE they make great value and quality watches only to screw them up with very short hands that in some models it's hard for the eye to make the difference between the hour and the minute hand.. This is still an inexplicable secret to me !

I work for the past office and we use military time so owning a Hamilton have worked best for me

Just to reiterate what Teddy says about the matter, knowing if it's AM or PM on your watch is useful when setting the calendar date, otherwise you can grind the gear down and damage the watch if the date is about to change to the next day. Makes sense

I think the watch looks more symmetrical with it and thats about it

I actually like it, military always goes by 24

Most people I know who wear a diver watch never dive and those who wear a chronograph never use the chronograph.

My logic is that you wake up in a shipping container with no way out and can't see if it's day or night outside, so a 24hr clock would be very useful in that scenario.

The 24hr scale is nice if you have to sign in and out of a logbook at work that's in 24 hr time.

Actually we have to do alot of paperwork at my job and we use military time so it can help with that as well.

I have the Orient Sun & Moon as my first mechanical watch, which has the Sun & Moon disk as an AM/PM indicator. It's not entirely useful for everyday use. But for someone who sometime takes a midday nap and wakes up confused about what part of day it is (6am and 6pm light can be confusing), the AM/PM indicator does come in handy.

Some people find function using Military Time.

Am pm helps with setting time with a date function.

Medical field would be a good one too. For 24hr scale

It makes it easy to set day and date on a watch

I think it help for military time conversion

I really enjoy the 24 hour sub dial. It's a great am/pm indicator. Mostly, I think it adds interest to the piece. It's constantly moving, in a different position throughout the day. With a 12 hour chronograph only one sub dial is moving. The other two being at 12. I enjoy using the chronograph, for the most part it's not in use. I have other digitals and a phone if I need a stop watch. That being a 24 hour stop watch. A chrono with two sub dials in motion is cool to me. So many people dislike this feature. They usually wish it was a 12 hour indicator.

24-hour scale is good only on GMT watches TBH.

It's just a nice thing to know how much is actually left of the day as such. Also helps with approximating e.g. how much sleep im about to get etc. Pp.

Bro clearly has never had one of those day time naps into the evening darkness where you’re unsure if it’s night time or the morning

I mean maybe it’s for people for whom day and night aren’t relevant The example that stands out are people in space where that concept is just void But also people submerged for a long time, maybe military personnel? I’m not sure myself but I can definitely see it having use

can be used as a compass but I'd much, MUCH rather have a 12 hour totaller

Easier to tell military time. 1:00pm would be 1300.

Because once I woke up @ 6pm after a very long nap and I was confused of whether it's evening or morning, when I asked it to my roommate they were laughing and nobody answered.

Military time. People who serve or is still serving would understand.