Right now, live: eighteen places, eighteen answers, half a dozen ways of writing them, and daylight-saving rules that change on different days, by different amounts, or not at all.
The grid time. The same number on every phone, laptop and wrist on Earth, right now.
Every clock reading you’ve ever seen is two facts welded together: when it is, and where you’re standing. Pull them apart and the chaos explains itself.
This exact moment where you are, written seven ways. Live.
Meaningless until you know the city, and which side of a daylight-saving switch it’s on.
Military time is still local time. It just adds homework: subtract twelve, then figure out where.
Local time with a French accent.
Local time in kanji. Still local.
Universal, but nobody lives in it. You convert before you can use it.
Unix time. What your computer actually counts. Perfectly universal, completely unreadable.
Universal and readable by anyone who has seen a decimal point. The only specimen that’s both.
The ruling: your clock should tell you when. Your window already tells you where.
Officially, one second is 9,192,631,770 oscillations of radiation from a cesium-133 atom. Not a heartbeat. Not a footstep. An atom in a vacuum chamber, in a lab you will never visit, doing something you cannot see, hear or feel.
That’s how many times it has oscillated since you opened this page. You felt none of them.
Someone split the day into 24 hours.
Someone else split each hour by 60, then did it again. A second became 1/86,400 of a day.
The Earth turned out to wobble, so in 1960 the second was redefined as 1/31,556,925.9747 of the year 1900. Not a year. The year 1900.
In 1967 it was redefined again as 9,192,631,770 cesium oscillations, a number chosen for one reason: so the second wouldn’t change length.
Since 1972, the atoms and the planet have drifted apart, so 27 leap seconds have been jammed into the world’s clocks, occasionally crashing servers along the way. The plan is to stop adding them by 2035.
The ruling: let the atom keep score in the basement. You should read time in pieces of the day you actually live through.
The grid doesn’t fire the atom. Labs, satellites and servers keep counting cesium underneath. A tick is simply 1/100,000 of a day, which works out to 0.864 of those atomic seconds.
Military time trips people up because 17:00 still has to be decoded: subtract twelve, add “pm,” then work out whose 17:00. Grid time doesn’t need decoding. It’s how much of the planet’s day is done, out of ten. 5.00 is halfway. 7.50 is three quarters. That’s the whole lesson.
The bar is live. The day is counted from midnight at Greenwich, the same reference every computer already uses.
| Unit | Share of a day | In old time | Feels like |
|---|---|---|---|
| Deci-day | 1/10 | 2 h 24 min | A deep-work block, or a short-haul flight |
| Centi-day | 1/100 | 14 min 24 s | A coffee run, or a standup that stayed on topic |
| Milli-day | 1/1,000 | 1 min 26.4 s | Microwaving leftovers |
| Tick | 1/100,000 | 0.864 s | One resting heartbeat, at about 69 beats a minute |
That’s 50 mph. A 60-mile drive takes half a deci-day.
That’s 125 km/h, a normal motorway cruise.
“9 to 5” is an assumption baked into local time. It assumes everyone works the same shape of day, and it makes everyone in the wrong zone do the math to fit around the people in the right one.
On the grid, nobody assumes anything. People say when they work, in numbers that mean the same thing to everyone. Early birds, night owls, parents who stop for the school run: their availability becomes a human fact instead of a time-zone guess.
Shaded bands are each person’s own stated hours, written in grid time. Nobody had to convert anything to draw this.
That’s what equity looks like on a clock. No headquarters time that everyone else bends around. No “Eastern” or “Greenwich” that the rest of the world translates into. One number, shared, and each person’s day described on their own terms.
Chicago to Zagreb with a connection, in summer.
Europe moves its clocks on the last Sunday of October. The US waits until the first Sunday of November. For one week, every standing call between them is off by an hour.
Decimal time isn’t a new idea. It failed because of hardware, not math. Every previous attempt asked people to throw out a physical clock. This one asks them to change a setting.
Every clock in the country would have to be rebuilt or replaced by hand. Suspended in 1795.
A thousand “beats” a day. To use it, buy a new watch. Anchored to Swatch’s hometown in Switzerland.
Smartphones put a software clock in billions of pockets. Smartwatches follow onto wrists. Every one of them can display anything.
Grid time is a free setting and one line of arithmetic. No clocks thrown out. No law required.
Your devices already count universal time underneath everything, as Unix time. Local time is a display layer painted on top. The grid is just a different coat of paint:
const grid = (Date.now() / 86_400_000 % 1) * 10; // 0.00000 to 9.99999Grid time is decimal time shared by the whole planet. The day is split into 10 deci-days, each deci-day into 100 centi-days, and so on. Every place on Earth reads the same number at the same moment, so there are no time zones and no daylight saving changes.
Take the current UTC time in hours, divide by 24, and multiply by 10. Noon UTC is 5.00 and 6:00 pm UTC is 7.50. In Chicago in winter (UTC−6), 9:00 am local is 15:00 UTC, which is 6.25.
Yes, and that’s the point. 0.00 is midnight at Greenwich because that’s the reference every computer, satellite and airline already runs on. We didn’t pick a capital; we picked the clock the machines were already using, then made it readable.
No. The sun keeps doing what it does. You work when it’s light where you are; your hours just get permanent numbers. In Zagreb in winter, daylight runs roughly 2.6 to 6.4. In Chicago in winter, roughly 5.4 to 9.4. Those numbers don’t jump twice a year.
Farmers run on the sun, not the clock face. Cows don’t check their phones.
Today we shift the clocks of eight billion people so schools don’t have to change their bell schedules. On the grid, a district that wants daylight at the bus stop moves the bell from 5.80 to 5.82, about half an hour later, and nobody else on the planet is affected.
Fair hit. A third of a day is 3.333 deci-days. Twelve and sixty divide beautifully. But nobody splits their day into exact thirds, and most of the world already gave up base 12 for money, distance and weight without missing it.
Honestly: anyone who liked that “call me at 9” meant morning. On the grid you need to know when the other person is awake. But you already need to know that today, and you have to recalculate it every time either country changes its clocks. On the grid you learn it once.
Once the day is a number from 0 to 10, other things fall out of it.
Seen from above the North Pole. The Sun is to the right.
0.000 on the grid × 36° = 0.000°
Measured against the Sun. Against the stars Earth turns a hair faster, about 361° a day.
The smallest grid unit is a hundred-thousandth of a day: 0.864 seconds. That’s a resting heart at about 69 beats a minute.
The same ten units for everyone. The sun hands them out very differently.
Daylight means the sun is above the horizon. The thin line is right now.
A flight leaves Chicago and lands in Tokyo the next day. How long was it in the air?
Same flight, same 12 hours. One of them needed a time zone table and a calendar.
A freelancer bills $50 an hour, or $120 a deciday. They work one block in the afternoon.
Time sheets become plain decimals, like the money they turn into. A centiday is 14.4 minutes, close to the 15-minute blocks most calendars already use.
The last three days and the next one, where you are.
Charts, averages and regressions need numbers that go up steadily. Clock readings have to be converted first; a grid date already is one. Within a single day the grid time is already linear. Just watch the rollover from 9.999 to 0.000, the same way you would watch midnight.
Checking your clocks…
On the grid, nothing happens. Not even a little.
The station circles Earth about every 92.9 minutes: 0.645 on the grid. That’s roughly 15.5 laps and 15 or 16 sunrises a day. Its crew keeps UTC, one clock, just like the grid.
A deciday is 2.4 hours, so distance over decidays needs no minutes-to-hours conversion. Miles per deciday is just mph × 2.4, and a few limits land on very tidy numbers.
Others that come out clean: 80 mi/dd (33.3 mph), 90 mi/dd (37.5 mph), 125 mi/dd (52.1 mph), 250 km/dd (104.2 km/h).
The Moon’s pull is slowly braking Earth’s spin.
Bars start at 20 hours. The average day grows by about 1.8 milliseconds a century. Hours and minutes would have to be redefined to keep up. The grid just keeps cutting whatever day we get into ten.