[jzwinck]

You already have to do that. Some pubs in England serve lunch only until 2 pm and some restaurants in Spain open for dinner at 8 pm. Go either place from the US and you already have to learn new opening times. America is one of only a few places with many time zones yet consistent opening times.

[anonymouz]

They are not exactly the same, but at least roughly: If I make a work appointment at 9:00 or 10:00, I can be pretty sure that it will fall into usual office hours. If I go to a shop at 16:00 it will probably be open.

[zanny]

There are 2 use cases for UTC:

1. People who don't leave their regional time zone very often.

2. Those that do.

The first group of people would have a week where they aren't used to getting up at 1:00 or eating lunch at 23:00. But that won't last long, because the schedule maintains consistency and people would just shift their hours accordingly.

The second group can now plan a flight, report the time they are landing to a colleague, not have to worry about time zone conversions, schedule a meeting 2 hours after that and know exactly how long in the future that is without worrying. An international conference call can just be scheduled for 5:00, and you don't need to mix time zones to figure out when that is. Two business associates can say "I'm available from 12 - 2, and you are available from 1 - 3, but since we use UTC we don't need to actually change those times to make them match, we just know the overlap".

That second use case is the one where current time systems are woefully inadequate, but because the majority of people persist in the first kind of time system, there isn't enough pressure to change to benefit the second. It requires coordinated effort, that a tiny wink of time where people have to adjust to a shift in the hour they get up or eat in the day is much worth the benefits of not having international commerce and business have to constantly adjust their times and do mental gymnastics to keep cross-time-boundary timekeeping in check.

[CJefferson]

I'm trying to decide if you are being sarcastic :)

For people who don't leave their own timezone very often (which is most people), there is thousands of years of background of the concepts of midnight, midday. There is a shared language around the world as to what happens at certain times, which would be destroyed by this.

If you want to organise meetings by UTC, why not just say "I'm available at 12-2 UTC"? See if it catches on (it certainly won't with most people who don't care about meeting in multiple time zones).

[harshreality]

Exactly. It won't catch on because most people will not know what UTC means, and will think you're crazy and eccentric. Most people do not even know their timezone offsets from UTC, and if they did they would consider the strain of applying that offset too taxing. They prefer that the meeting organizer state the meeting time in the attendees' local time. If it's not, and the meeting is important, they'll try to convert it, but they may get it wrong (especially with daylight saving time in the mix).

A great example of this is that most British think London time tracks UTC even during the summer. You talk to them about meeting times in UTC, and they'll be an hour off as long as London is observing DST.

[zanny]

> I'm trying to decide if you are being sarcastic :)

Bizarrely, no, for some reason I think not having to google "EST to PST" or "AST to MO" or figuring out if someone is in the same day you are is a good thing.

> For people who don't leave their own timezone very often (which is most people), there is thousands of years of background of the concepts of midnight, midday. There is a shared language around the world as to what happens at certain times, which would be destroyed by this.

Interestingly, I have not been alive on the order of millenia ,but decades. So has most of the currently living human population. A large portion of them have also been exposed to the marvels of electrisity, instant global communication, and the understanding that human beings have walked on another rocky body that is not this one.

Midnight and midday has no problem translating into UTC. My midnight is 6. My midday is 18. Neither are bound to the concept of 12 or 0, or am or pm, but to the times where the sun is highest or "lowest" in the sky. That happens at different times at different points on the globe.

> There is a shared language around the world as to what happens at certain times, which would be destroyed by this.

People universally wake up at 7am, go to work from 9 to 5, eat lunch at 12, and eat dinner at 6? The "expected" times to do things don't need to shift, and having a common number translated into local time zones for events doesn't matter if you are communicating across time lines because you are already distant. The only time time zone comes into effect is when you communicate or travel across these artificial bounds, and having to reconsolidate the local cycle to what you are used to is nothing compared to the present day overhead of translating times for meetings and communication across artificial bounds.

[jzwinck]

Again, not in Spain, where 16:00 is siesta time for many if not most shops and a closed period for restaurants. You seem to expect what you're accustomed to, all over the world. But it doesn't work that way, even for seemingly simple cases. And it isn't just Spain--for example, Hong Kong's electronic trading closes from 12:00 to 13:00. You'd have thought you could trade at mid-day on any exchange, but you can't!

[lessnonymous]

So now you have 1 piece of general data (4pm is an OK time to go shopping) and one piece of specific data (not in Spain).

With a global UTC system, you have to remember that in Spain you can shop from 1100 - 1700, but in Melbourne you can shop from 1900 - 0700. In New York you can shop from 0800 - 1600.

Every single place will have it's own data you have to remember, not one piece of general information plus a few specific pieces.

[anonymouz]

That's why I said "probably". Obviously there are local differences and customs. Nobody claims you can magically predict exact opening times for where you happen to be at the moment, but you'll find that the day to day activities generally are aligned with the local solar day, and in fact, most probably the siesta has it's reason in the extreme heat during the afternoon in Spean.

[chris_j]

That is very true and something that I hadn't given thought to. Still, consider how much greater the confusion would be if, for example, you had to remember to get up at midnight, eat lunch at 5am, go to bed at 4pm and so on.

[zanny]

I'm going to argue that if we did a global switch to UTC, current trends are already leading to border time zone regions migrating their schedules closer together (the American "day" has been steadily getting later in the actual day over the last century, and I'd argue that is in part due to a business-wise synching of times with west Europe).

We are caring less and less about when the sun is out. I figure in a few centuries, a lot of communities will be massive buildings without any sun exposure anyway. We will be flying through space and metrics like the height of the sun over the horizon no longer matter. Time isn't something best represented as arbitrary numbers across datelines, it is best represented as a consistent, constantly incrementing value. The fact the sun rises and sets in different parts of the world at different times isn't an excuse to keep the time system reflecting a giant ball of plasma that less and less drives our daily activities.

[tsotha]

>I figure in a few centuries, a lot of communities will be massive buildings without any sun exposure anyway.

I would be surprised if that turns out to be the case. People need sunlight to be healthy, and while you could certainly create artificial sunlight it would still cost resources, and there's a big benefit to having most people awake during roughly the same hours.

[jzwinck]

There are massive downsides to having everyone on the same schedule, too. Most infrastructure has to be a lot bigger to accommodate the peak loads. Roads are plagued by "rush hour," call centers have "longer than expected hold times," and coffee shops have to decide whether to ask staff to work short shifts or pay them for periods when they are not needed very much. These things reduce productivity and even kill people.