Part 1: Build your own Google Sheets Formula Clock

Step 1

Open a blank Google Sheet or create a new Google Sheet

(Pro-tip: type sheet.new into your browser address bar to do this instantly)

Step 2

Copy the Google Sheets Formula Clock formula below and paste it into the formula bar for cell A1 of your new Sheet:

=SPARKLINE(
ArrayFormula({
QUERY(ArrayFormula({
0, 0, 1 + N("See Comment 1");
0, 0, 0.8 + N("See Comment 2") ;
SEQUENCE(37,1,0,10),
SIN(RADIANS(SEQUENCE(37,1,0,10))),
COS(RADIANS(SEQUENCE(37,1,0,10))) + N("See Comment 3") ;
SEQUENCE(12,1,30,30),
0.9 * SIN(RADIANS(SEQUENCE(12,1,30,30))),
0.9 * COS(RADIANS(SEQUENCE(12,1,30,30))) + N("See Comment 4") ;
SEQUENCE(12,1,30,30),
SIN(RADIANS(SEQUENCE(12,1,30,30))),
COS(RADIANS(SEQUENCE(12,1,30,30))) + N("See Comment 5") ;
SEQUENCE(4,1,90,90),
0.8 * SIN(RADIANS(SEQUENCE(4,1,90,90))),
0.8 * COS(RADIANS(SEQUENCE(4,1,90,90))) + N("See Comment 6") ;
SEQUENCE(4,1,90,90),
SIN(RADIANS(SEQUENCE(4,1,90,90))),
COS(RADIANS(SEQUENCE(4,1,90,90))) + N("See Comment 7")
}), "SELECT Col2, Col3 ORDER BY Col1",
0 + N("See Comment 8")
) ;
IF(
MINUTE(NOW()) = 0,
0,
SIN(RADIANS(SEQUENCE(MINUTE(NOW())/60*360,1,1,1)))
),
IF(
MINUTE(NOW())=0,
1,
COS(RADIANS(SEQUENCE(MINUTE(NOW())/60*360,1,1,1)))
) + N("See Comment 9");
0, 0 + N("See Comment 10") ;
0.75 * SIN(RADIANS((MOD(HOUR(NOW()),12)/12 * 360) + MINUTE(NOW())/60 * 30)),
0.75 * COS(RADIANS((MOD(HOUR(NOW()),12)/12 * 360) + MINUTE(NOW())/60 * 30)) + N("See Comment 11")
}),
{"linewidth",2 + N("See Comment 12")
+ N("
Comments:
1: Initial (0,1) coordinate at top of circle. Extra 0 included for sort.
2: Coordinates to create mark at 12 o'clock.
3: Coordinates to draw initial circle. Joins markers every 10 degrees starting from 0 at top of circle, e.g. 0, 10, 20, 30,...360
4: Sequence of coordinates every 30 degrees to create small markers for hours 1, 2, 4, 5, 7, 8, 10, 11
5: Sequence of coordinates to connect the 30 degree small markers. Needed to place them correctly on circle.
6: Sequence of coordinates every 90 degrees to create large markers for hours 12, 3, 6, 9
7: Sequence of coordinates to connect the 90 degree large markers. Needed to place them correctly on circle.
8: QUERY function used to sort the circle data by the degrees column, then select just the (x,y) coordinate columns (numbers 2 and 3) to use.
9: Coordinates to create the minute hand. Includes an IF statement to avoid an error when the minute hand arrives at the 12 mark.
10: Coordinates to return to centre of clock at (0,0) after minute hand, to be ready to draw hour hand.
11: Coordinates to create the hour hand.
12: Set linewidth of the Sparkline to 2.
.
.
Google Sheets Formula Clock
June 2019
Created by Ben Collins, Google Developer Expert and Founder of The Collins School Of Data
Website: benlcollins.com
Twitter: @benlcollins
")}
)

Initially it will look like this:

Step 3

Make row 1 wider by hovering between rows 1 and 2 and using the grab hand to drag the row boundary down. Make the cell wide enough to create a circle:

Step 4

This is the step that makes the clock tick!

Under File > Spreadsheet settings set the spreadsheet calculation settings to be “On change and every minute”, like so:

This ensures that the NOW function is refreshed every minute, so our clock hands move around the circle. That’s it!

You should see the hands of your clock moving around the face.

Tick-tock! Tick-tock! 🕰️

Part 2: How Does It Work?

So there’s a few things going on here.

We need a way to get the current hour and minute values and have them update automatically.

Then somehow we need to draw a clock face with hands using…formulas? Huh? 🤔

Let’s run through the building blocks…

We can use our friend the SPARKLINE function to create the clock face:

Create A Circle With The Sparkline Function

The SPARKLINE function is used to create miniature charts inside a single cell. That’s its modus operandi.

However, we can also supply it with a range of x- and y-coordinates to create 2-d shapes, like a circle for example.

Use the following five steps to create a circle with a sparkline:

1) Start with this function in cell A1:

= SEQUENCE ( 37, 1, 0, 10 )

The Sequence function syntax is SEQUENCE(rows, columns, start, step) so in this example we’re creating 37 rows in a single column, starting from 0 and increasing in increments of 10 each.

I.e. it outputs a column of numbers representing every 10 degrees of a circle, up to 360 degrees.

2) In column B, we add this Array Formula in cell B1:

= ArrayFormula ( SIN ( RADIANS ( $A$1:$A$37 ) ) )

3) And in column C, this one in cell C1:

= ArrayFormula ( COS ( RADIANS ( $A$1:$A$37 ) ) )

Columns B and C now give you the coordinates of a circle.

4) Let’s plug them into the SPARKLINE function in cell D1 with this function:

= SPARKLINE ( B:C )

5) Lastly, make row 1 wider to show the circle.

Boom! 💥

The SPARKLINE function draws a circle for us:

Then, we need to create a time that automatically updates every minute. Thankfully that’s relatively easy to do with the NOW function:

NOW Function + Spreadsheet Settings

(Feel free to type these formulas in to the side of your sparkline workings in column B, C and D.)

= NOW()

The NOW Function in Google Sheets outputs a timestamp with a time to the nearest second. It’s a volatile function, which means it recalculates every time a change is made to the Sheet. In other words, it gives a new timestamp.

Per the Step 4 in Part 1 above, we can set the Sheet to update every minute, so the NOW function updates every minute.

Get The MINUTE And HOUR From NOW

It’s relatively easy to extract the minute and hour from the timestamp, with these two functions:

= MINUTE( NOW() )

and

= HOUR ( NOW() )

We need to convert these to degrees on a circle to show how far round the hands have gone.

The formulas become:

= MINUTE( NOW() ) / 60 * 360

and

= MOD( HOUR( NOW() ), 12 ) / 12 * 360

respectively.

Later we’ll need to convert these to RADIANS and then into coordinates for the sparkline function.

That’s the mechanics of the clock-tick-tock part, but we still need to add them to our sparkline clock.

Add The Clock Hands

The middle of our circle is represented by the coordinates (0,0).

Currently our sparkline has positioned us at the 12 o’clock position, represented by (0,1).

To add the minute hand, we need to draw another arc round the circle to travel around the edge of the circle to the current minute value, e.g. if it’s half past the hour then we need to draw another half circle to position ourselves at the bottom of the circle.

Then we can simply draw a line back to the centre of the circle, and that’s our minute hand!

Essentially, what these two formulas are doing is working out how many degrees around the circle we need to go, and calculating the coordinates.

Finally, let’s return to the centre of our circle, thereby drawing the minute hand.

In cell B398 put a 0.

In cell C398 put a 0.

They need to be on row 398 to give the array formula for the minutes enough space to expand (max 360 rows).

The “clock” now looks like this, and if you’ve set your spreadsheet to update every minute (see Step 4 in Part 1 above) then you’ll see this hand move around the clock.

To add the hour hand, it’s a case of drawing a line from the centre coordinate (0,0) — where we are now — back out to the edge, again, going as far around the circle as needed to represent the current hour.

Unfortunately, in it’s current state, the formula breaks down at the top of the hour:

This is easily solved by wrapping the minute hand calculation with an IF statement to set it to zero at the top of the hour. This IF statement tests to see if the minute component of NOW is equal to zero and sets the value to 0 if it is, otherwise we just proceed with the full SEQUENCE function.

You might consider the following improvements, but I’ll leave these as a challenge for you:

Smoothing the hour hand, so it doesn’t jump in discrete steps from hour to hour but instead moves smoothly between the hours in proportion to the number of minutes passed. (See the GIF image at the start of this post.)

Adding tick marks at each of the 12 hour marks around the clock face.

This is a transcript of a conversation between two famous spreadsheet applications, Google Sheets and Microsoft Excel, who, in mid-2019, sat down together at a well-known beach bar, The Pivot & Chart Tavern, for a catch-up after a long WORKDAY.

For the DURATION of their meeting, SMALL and LARGEFISHERmen came and went, smelling of POISSON from the Sea.

It was a DAY to remember.

Google Sheets: “Excel! Dude! GAUSS who, yo? It’s been DAYS, MONTHs even, since we caught up. You made it. You crash so often I wasn’t sure you’d get here.”

XL: “Ah Google Sheets, you again. Rude, impetuous, cheeky. I see you’re still as mature as toddler in a COT. Still on a formula-only diet are you? Do you know FACT from fiction yet? Is this establishment to your satisfaction? I do hope it’s NOT out of your PRICE range.”

Sheets: “Woah, so aggressive. Nope, I’m all grown up now. IMREAL deal! I’m TRIM, check out my ABS. Still TRENDy and UNIQUE of course. I have so much going on right NOW, so many cool and COMPLEX features, and an ever growing, engaged, passionate community.

What about you, Excel, still hanging on? Haha.”

XL: “Hanging on? Totally FALSE! You should respect your elders.

NOW listen to me young man, I was doing advanced financial modeling whilst you were still popping zits on your funny little (inter)face. I may be over 30 YEARs old but I’m in the best health I’ve ever been. I continue to enjoy consistent product GROWTH.

Contrary to some of the marketing materials new-fangled upstarts put out, I’m very much alive and kicking, and still dominating the office data analytics scene, thank you very much. It seems you’re in rude health too Sheets, your voice is LOWERNOW, full of CONFIDENCE. Let me buy you a drink.”

Sheets: Sure, a beer please.

XL: So unsophisticated.

Turning to the barman…

XL: A beer, and I’ll have your finest aged red wine please. Put it all on the same TAB, thank you.

Barman: That’ll be 0.00091 Bitcoin please.

XL: Oh come on! Can you convert that TO_DOLLARS please?

Barman: As you CHOOSE, let me SWITCH the payment….that’ll be 10 Dollars EVEN at TODAY‘s price…

Excel hands over a 20 Dollar bill.

Barman: Is that DMIN bill you’ve got?

XL: Yes, I’m sorry for the trouble.

Barman: Ok, DMAX change I have is in 1 Dollar bills…

XL: That is no problem.

After a short SEARCH for an AREA to sit, and a brief interruption when they were INTERCEPTed by an errant ROMAN soldier, they took their seats at one of the PIVOT TABLES near the bar, to continue their rather KURT conversation…

Sheets: Do you think ISODD Excel? I MEAN, here we are in rude health, still the pre-eminent way the majority of knowledge workers manage and analyze their data.

XL: Yes, it’s TRUE! We have some sticking POWER that’s for sure. I take it as a good SIGN that our respective platforms continue to evolve and maintain their critical usefulness.

Sheets: Ok, let’s get down to business then. I want to share my theory of why we’re still the pre-eminent solution for many people…

XL: Ok, Sheets, the FLOOR is yours:

Sheets: First off, we’re ubiquitous. We’re everywhere. You’re in every office and I’m in every browser. So there’s that.

Second, we can solve most problems. Yes, there is ultra-specific software that will do certain tasks better, but nobody beats us for overall utility.

Third, we’re easy to use. Beginners can just dive right in, but we’re complex enough that even the most advanced users will never run out of things to discover.

XL:RIGHT, All TRUE, all good points. We’re definitely on the same FREQUENCY here.

Sheets:AND, we’re super flexible, so we can easily adapt to new tasks or new use cases.

XL: Yes, yes, indeed. Plus, almost all SaaS platforms have a button that exports data to Excel or Sheets. I suspect a lot of people use this, but of course that’s not a good metric for a SaaS company to divulge.

XL AND Sheets both have a little chuckle at this…

The conversation rambled on for several more HOURs. The EFFECT of the drinks made the conversation take an ODD turn:

XL:Have you ever BIN2OCT-oberfest, Sheets? You know the one I mean, the beer festival in Bavaria in the fall?

Sheets: Yeah, yeah I know the one, but no, I haven’t. Have you ever BIN2HEXham, XL?

XL: You mean the market town in the UK, right? Only once. And the airline lost my TRUNC on that trip! What a palava that was!

Sheets:TRUNC! Bwah! Now you’re showing your age. Haha. And definitely no chance of a TAN at that TIME of YEAR.

At a lull in the conversation, they both look down at their phones.

Sheets: Check this out, old man.

Sheets holds up his phone, with an app open called INDEXMATCH.

Sheets: It’s a dating service for spreadsheets. You right click on Sheets you like, left click on ones you don’t. It uses their IMPORTRANGE algorithm to MATCH you with other Sheets. Super cool.

XL: Bah, sounds like it’s just for HLOOKUPs to me. The more discerning spreadsheets look for love through a service called EDATE, all based around your star SIGN.

Sheets: Sounds like hokum to me…

You hungry Excel? Shall we get a PI?

Excel: You mean like a pizza PI? Could do, as long as we ADD spinach and ricotta, MINUS the mushrooms. Though I’d rather have CHAR-grilled steak.

Later, replete after dinner, it was time for the two friends to bid farewell…

XL: Right then Sheets, before you SLOPE off, let me tell you, it was good to catch up. TEXT me whenever you want to have a drink together again.

Sheets:ISEMAIL ok?

XL: As you wish. I’ll ask Numbers, LibreOffice, Airtable and maybe a few others to JOIN us next time, ok? They’re PROBably feeling LEFT out.

My rather silly story was inspired by a similar, although much funnier, function-themed story from Mr Spreadsheet himself, John Walkenbach. Sadly I can’t find it online anymore, but if anyone can share the link, I’ll add it here.