**What’s A Timestamp?**

Under lots of circumstances, would you enter the date on a spreadsheet for an entry onto an invoice, a project plan etc and you would do this by entering the current date and time. This however is usually done manually by the user, and takes way too much time for us wanting to Excel At Excel.

We probably all know that we can use the =TODAY() formula or the =NOW() formula to enter a date into Excel, which update automatically when – this is known as “volatile” as the function recalculates when Excel updates.

This is not really any good for a timestamp, as we would want an invoice entry or project update to be static. We therefore can use

CTRL+ ; to enter the current date or

CTRL+SHIFT+: to insert the current time

These both will remain static, but are still very manual having to insert the date and/or time with keyboard the above shortcuts. That’ all well and good but wouldn’t it be great to just insert your changes to a worksheet and the timestamp appear as you type?. You can but it takes a bit of Excel magic and an understanding of Circular Formulas.

**What’s this about Circular Formulas?**

You may have come across them before but if not here’s a quick run down.

A circular formula is one that refers back to itself either directly or indirectly. Let’s take a look at an exmaple.

Lets look at a direct example.

If I type =A4+1 in cell A4 I am directly referring to the cell I am writing the formula in. This results a warning from Excel in case you did not create this circular reference intentionally (as we did) and the result of the formula is zero.

Let’s look at an indirect example

If I type 2 into cell A1,

then type =A1 into cell A2

then A2 refers back to A1 and gives a result of 2 which is a normal formula.

If I then go back to cell A1 and enter the formula =A2+3, this will create a circular formula as A2 is based on A1 and I am writing the formula in A1 so essentially the formula is referring to itself.

You can see above that the circular reference is indicated by Excel with blue vertical line after selecting OK to it’s warning.

Ok so let’s take this one step further…..

There is a setting in Excel called ‘iterations’, which tells it how many times to recalculate a formula. Without this function, Excel would go into an infinite loop and eventually stall. By default this is turned off in Excel which is when when you type a circular reference , Excel throws you a warning and doesn’t calculate the formula as it could run infinitely.

If we turn on the iterations function

1. Office button

2. Excel Options

3. Formulas

4. Iteration

5. Change the default iteration to 1, so it recalculates one time before it stops.

In our case this will result in cell reference A1= 5

So, at the start of this post we were to insert time stamps into Excel, we can exploit this circular referencing and iteration to our full advantage based on the theory above to insert our required time stamps.

Let’s go ahead and do that- in a scenario that we want the timestamp to be in Column A when we are entering data into Column B

1. Type the following formula into A1

=IF(B1<>”",IF(A1=”",NOW(),A1),”")

2. Type something into Column B

3. Your date and time will be stamped.

4. Drag the formula in Column A down to allow time stamping all down your column.

Isn’t that just the bees knees?

**An explanation of what the formula is doing.**

The formula is checking cell B1, and if it is not empty it runs the circular formula =IF(A1=”",NOW(),A1) which returns the NOW() function if A1 does not already have a value- thus stamping the time.

Go ahead and give this a go, let me know if you have any other way of creating a time stamp in Excel?

**Other Formula Information You Might Like.**

1. Hide Your Formulas From Prying eyes.

2. Debug And Understand Your Formula Errors.

Hi,

This is awesome…thank you for the formula. I have a question. Does this update everytime the cells in column A changes? So for example Cell A1 changed yesterday timestamped 11/07/2011. But I changed it again today. Does it time stamp 11/08/2011?

Thanks,

jurell

Jurell

No this formulas does not, it timestamps the time the cell was changed, and does not change if you overtype.

If you delete the original value from the entry cell and then type a new entry — a refreshed timestamp will appear.

Regards

Barbara

Hello,

Great formula, I’ve used it for work already, and came through in a pinch in creating a spreadsheet for my team. Quick question though, my timestamp formula doesn’t generate the time as well, just the date. So it only spits out “12/21/2011″ for instance, not “12/21/2011 11:56″. Any ideas how to fix that?

Thanks again!

Tim

Also, what is your solution to fixing the fact that Excel resets the maximum iterations setting for each new session of Excel? Is there a way I can save that setting so that it is locked for a certain workbook?

Thank you,

Tim

Tim

The iteration settings will remain within the workbook you have set once you save your workbook. Excel opens with the default of iterative calculation (as unselected) setting for each new workbook opened.

Regards

Barbara

Tim

Glad you liked the formula, it does come in handy. Also good point to note on the date and time.

If you format the timestamp column as dd/mm/yy hh:mm that you sort that for you. Use Format- Cells- Date- Custom as select the above formatting.

Regards

Barbara

When you use the NOW function in that formula it appears that it is also attaching the time to the date. If you then use that data for a pivot table with column headers to be the date you exceed the number of days as it makes an entry for every time stamp instead of every day. Is there an easy fix for this?

Hi,

I already used your formula and it was great.. But I came up with a problem when I want to share the excel spreadsheet over google docs.. google docs doesn’t support iteration. Can you suggest another way to solve this. TIA for your reply.

Hi Fadly

Indeed Google Does not support some functions and iteration is one of them.

Any comments from any other Excellers greatly appreaciated on this one!

Barbara

This was just what I was looking for! thanks for sharing!

This formula sounds like EXACTLY what I need, but I keep getting an error when I paste it into my spreadsheet.

“The formula you typed contains an error”.

Any ideas?

Mike

I have retyped the formula into the post, seems fine on Excel, want to try it?

Let me know how you get on

Barbara

Hi Barbara,

this is not working for me . its throwing up error. It would be great if you can fix it.

Thanks

Sree

Hey Sree

I have re tried formula again and seems to work fine

=IF(B1<>“”,IF(A1=”",NOW(),A1),”")

do you want to send me worksheet to barbara[@]howtoexcelatexcel[dot]com will take a look at it for you?

Regards

Barbara

Thank you barbara!

=IF(B1″”,if(A1=”",NOW(),A1),”‘) this is working.

thanks a lot again

Sree

You are welcome- no problem

Barbara

Hi Barbara,

This is going to be a great trick if I can get it working.

I notice that your screenshot has:

=IF(B1″”,IF(A1=”",NOW(),A1),”")

But the formula you typed in red is

=IF(B1<”",IF(A1=”",NOW(),A1),”")

_________________________________

I tried both and I can't get this timestamp to work. When I type this

=IF(B1<”",IF(A1=”",NOW(),A1),”") the formula generates a BLANK cell.

And when I type this:

=IF(B1″”,IF(A1=”",NOW(),A1),”") it returns 12:00AM.

It is as frustrating. Now I know why seniors never program their 12:00am blinking VCRs.

=IF(B1″”,IF(A1=”",NOW(),A1),”")

oh… these greater than less thans

works _for every cell except for A1.

That is great

Thomas

there was a small error in formula after last edit on the post it was missing the <> at the start of the formula- appologies. To get date stamp not just time, format your column A with format dd/mm/yyy or whatever you want to. Let me know how you get on

Regards

Barbara

I believe this is a formating issue w/ the quotations in the formula when copying from this site to Excel. I noticed after clicking OK to the error prompt Excel highlighted the first of quotations (indicating/debugging where the first problem resides). I retyped the quotations, received the same error. Again, after clicking OK to the error prompt Excel highlighted the second set of quotations, I replaced those, as well as the third set to resolve the error. Works fine now. Just to be safe you may want to manually enter the entire formula instead of copying and pasting to avoid any errors such as this one. Hope this helps!!!

I get a date result of January 00, 1900 using this formula instead of today’s actual date. Any idea of whats causing this?

Thanks

Actually looks like I figured it out. The formula doesn’t work if you have a list validation set up in A1.

If I type something into A1 I get the expected datestamp. If I enable validation and create a dropdown list, the formula returns January 00, 1900. Any idea how to fix this?

Possibly your formatting of you cells, have you checked that- I also used a validation on my entry cells and works fine. Send on your worksheet – let’s have a look

Regards

Barbara

I am having the same problem concerning a list validation and 01/00/00 diplaying as the date. What was the solution? Also, will the date change everytime I open the workbook to the current date or will it remain the date the cell was last updated?

Nadine

Ensure your cell formatting is dd/mm/yy hh:mm- you should be good to go.

Regards

Barbara

I am having the same problem and cell formatting is appropriate?

@Laura

is the iteration setting correct?

regards

Barbara

Hello everyone,

Formula works fine by adapting the original one to: =SE(b1″”;SE(a1=”";AGORA();a1);”").

Thanks Barbara for your hints!

Jorge

Brasilia – DF

Brazil

Hi

I have a real time data which i need to save in a excel file with different enteries for different time slots.

Can anybody help me how to do it at earliest

thanx

thank you so much for the timestamp! I’m a middle school teacher and this is how I am going to do the dreaded bathroom sign-out and after school sign-in sheets next school year

Molly

Glad to help..

Regards

Barbara

I am a high school librarian and i am wanting to create a student sign in sheet for the library. I don’t know much about excel. I’ve read all the posts and I’m still lost. I’ve set the iteration and tried the formula. I’m not getting a date/time at all. I’m getting an odd string of numbers. Maybe i need to have something else set up as well. I would appreciate any help. What if i want the date/time stamp to be in column “D”?

Hello Kim

Thanks for the email. I have entered the formula into your worksheet, just needed a tweak, to reference the fact that your entry for data is in column A. Also I reset the iteration value which was not saved. Just drag the formula down the column to create more timestamps

i hope this solves your problem

BARBARA,

So what did you do in the instance of having a list validation follow the timestamp? Mine is popping out the Jan 1990 date and not the current one. Any way to fix this.

Thanks,

Ollie

I have data validation working no problem. Which cells have you validation on? I have validation on columns to the right of the cells with timestamp – validation being a yes or no option.

Barbara

I’ve been looking for a time stamp formula to use with a macro button. In other words, every time the button is selected it records the current time in the next row in a column. Any suggestions would be greatly appreciated.

Doise, have you an example work sheet?, you can mail me at barbara [at] howtoexcelatexcel[dot] com

Regards Barbara

I wish to have the know-how to upload hyperlinks plus video clips of my vacations in addition

to the places whereby I’ve run a race. Ideally, I would personally choose to have the ability to update my blog with entries from my iPad. What might you suggest is most likely the right way to go about executing this?

This was a super help! Exactly what I needed! Thanks a ton!!

Hi,

Is there a way this update can span multiple colums?

Hi Eddie

Do you mean the time stamp update multiple columns? or a cell be timestamped when multiple columns are updated?

Let us know

Regards

Barbara

Barbara,

Is there a way to automatically turn cell protection on once a value has been entered into cell B1? To prevent the time stamp from being manipulated at a later time?

Thanks!

Without having to manually protect the cell that is

I thought this would be great, something I’ve wished for. Now I type @NOW() and then go back to the cell and copy then paste special as VALUES.

However your formula does not work on my 1Mac using OX X Version 10-8-1

Any fix?

Bill

Is it the @now() that does not work on your MAC or the the timestamp- both work on both my Windows and Mac OS?

Regards

Barbara

I’m trying to set up a formula to automatically enter the current date in a cell once another cell is updated. I don’t want this date to every change after the entry is made. so we can track information by date it was entered. The formulas above are just not working. Can any help me.

Rs,

couple of things

1. did you copy the formuala, it needs to be typed out rather than copied

2. did you amend the iteration settings?

Regards

Barbara

Hello Barbara,

I don’t know if its possible to create a timestamp from a text. I am currently working on a spreadsheet to consolidate cases or data at work. The idea is if A1 has a value “CLOSED” B1 should have a timestamp or date when a case or request has been closed this is to have a automatic notification with timestamp.

Please help.

Thank you,

Khromwell

I have entered the formula above and works fine except for one thing. Each time I open the Excel document the time stamp changes to that specific time in which I have just opened it. I want to keep track of when info is entered in a specific cell. For example I am keeping track of time that I have worked on a project so when I put an X in a cell that says I worked on it on Monday at this time. Each time I open the document the time is changing on me. any way to make it so it doesn’t change the time?

Thank you and God Bless,

Andrew E

Andrew

Did you follow all of the stages in the blog post, ie the iteration settings?

Regards

Barbara

Yes Ma’am I did. Not sure what I may or may not be doing correctly. I even did what you showed in your example and it changes both cells to the current time.?

Thanks again for your help and any more information you may be able to supply.

Sincerely,

Andrew E

Dear Barbara

Thanks a lot, nice and convenient. I would call myself experienced user, but I could’nt figure out to create this timestamp. I use it to timestamp some weighing measures, which need to be analysed together whith other data from a datalogger. And just to inform you, it works fine in libre office in ubuntu.

Regards

Lars

Lars

Thanks for the feedback and the information about LibreOffice- good to know

Regards

Barbara

Great Trick !! Truly Awesome !

Hi!

I used your formula and it worked perfectly. But I have a very small problem. I created a worksheet that has two kinds of time stamps. One is start time. So, the START TIME is linked to a drop down menu that i created on excel so, it automatically registers the time every time I select something on the menu. Next one is the END TIME which is linked to the same drop down menu but different line number. (To explain it, the START TIME is linked to F5 while the END TIME is linked to F6.) It both works well. Now, problem is… I have to create “hours” where it shows the interval between the START and END time in a circular command. Please help me on this one as I have been working on this for 4 days already.

Thank you!

This is great but how do i get it to work in a data table

Hello,

I can get the formula to “work” but I have tried “several” different options for formatting the cells and it just keeps coming up #VALUE!?????? I used “custom” formatting: mm/dd/yy hh:mm:ss AM/PM the last time but I still get #VALUE!

Also, I noticed in the former comments that the Iteration does not work in Google doc’s – is this still true?

Thank you

This was just what I was looking for…

But when I do it in Excel for Mac 2008, it’s just populating A1 with “Date-stamp” whether there’s anything in B1 or not.

Allowing iterations or not doesn’t seem to make any difference.

Can you advise? Thanks

Apologies – ignore my last comment – it was because I wasn’t using A1, I was using A2. Duh!

All Good Rob…All Good

Hi Barbara,

Nice formula, thanks for sharing. I used this in making our Timesheet for our team.

But i just have a question.

I’m having a problem in making a time difference using this timestamp.

can you help me compute for the overtime and undertime using this timestamp?

Thanks a lot.

Hi

No problem at all, send me a copy of your workbook, with what you require you can sanitise the data if want to.

Regards

Barbara

Hello,

Thanks for this formula! However, I will sometimes have black fields in some columns depending on the week. Is it possible to use this same formula using a range? I tried and the formula didn’t work. Any ideas?

Michelle

Can you supply a few more details of what you are trying to acheive

Barbara

Hi barbara,

I used your formula in cell A1 but I’m getting weird values out as i type in B1 – B10 cells.

Please help

@Nik

Check iteration settings and formatting first of all.

make sure all are exactly in tutorial

Barbara

Hi Barbara,

I’m copying your formula across, and adjusting the relevant cell references. The error message is then duely coming up, but it wont give me the option to continue. If I click OK it deletes the formula. What am I doing wrong?!

Many thanks,

Annie

Annie

Make sure you re type the formula, the copy and paste does not work when copying to excel form the blog.

Barbara

Barbara,

I have created a daily checklist as a management/audit tool for my global team. I am using it as a way to track whether my employees in India are completing their daily responsibilities by a given time. I use a new version of the same file every day, and am hoping to archive the prior results for sudit purposes. For this reason, I have the file as a shared file, but the problem I am running into is that I can not get accurate timestamps as the file only updates the time of my most recent save, not when each individual has completed their task at the specific time. Is there a formula for timestamps I can use where the timestamp value is fixed to the same time no matter which user has the workbook open?