Hi Max - wouldn’t that be DATETIME_DIFF?

See https://support.airtable.com/hc/en-us/articles/203255215-Formula-field-reference#date_and_time_functions

Exactly what I needed. Thanks Martha

Is the second part of the original query possible – to calculate the number of weekdays via DATETIME_DIFF or another formula?

Hi Mike -

Probably you can get that with more elaborate calculations, but I haven’t tried to work that out. I don’t see that Airtable yet has the functionality that Excel provides with NETWORKDAYS.

Martha

Old thread; but hey the topic still has merit

I tried this formula DATETIME_DIFF([date1], [date2], ‘units’) and I get an error message so tried this:

DATETIME_DIFF(IDate Depleted], dDate Purchased, ‘days’) and so I am assuming I am doing it incorrectly.

I would love to see Business days added to the Supported unit specifiers for DATETIME_DIFF

Some of you in this thread might be happy to know that we’ve implemented a WORKDAY() function!

The format is WORKDAY(startDate, numDays, ,holidays]) and it returns a date that is numDays working days after startDate. Working days automatically exclude weekends, and you can include an an optional list of holidays as a comma-separated string of ISO-formatted dates, e.g.

WORKDAY({Launch date}, 100, '2017-09-04, 2017-10-09, 2017-11-10')

Excellent! Could we please have the inverse function as well (a function that will return the number of workdays/workhours between two date/time fields)?

Does anyone know how to use the datetime_diff function with multiples dates in one cell that are then compared to one date? Example of the picture below.

You would need to run your datetime_diff function in the table where your Calls are located (using a lookup field for onboarding date if necessary). Then, you could bring the results to the current view with another lookup field in the same way you have brought in the Dates of Call IDs.

We’ve also just added a WORKDAY_DIFF formula! Documentation here.

It takes in a start date, end date, and optional list of holidays, like so: WORKDAY_DIFF({Assignment date}, {Due Date}, '2017-09-04, 2017-10-09, 2017-11-10'), and returns the number of working days between the start date and end date, inclusive.

For those of you familiar with Excel or Sheets, it’s pretty much isomorphic to the NETWORKDAYS formula in those products.

I’m in the same boat. Here’s what I’m trying to run:

DATETIME_DIFF( Start date], IEnd date, ‘weeks’)

However, I’m still getting an error message.

So this leads me to two fundamental questions:

• 
  

  Can I deduce the difference between two fixed dates (or does it have to the number of days, weeks, etc. between a past date and the present)?

  
  


• 
  

  If so, how can I fix my formula?

  
  

Thanks!

By

do you mean you aren’t allowed to save the field but instead see a message beginning, ‘Sorry, there was a problem saving this field’? Or do you mean you can save the field correctly, but when you try to run the formula by populating the fields, you get an #ERROR message – or a NaN error?

That’s right, it says ‘Sorry, there was a problem saving this field’?

In that case, it’s because you’re using the wrong characters to enclose the field names. Give this a try:

DATETIME_DIFF({Date Depleted},{Date Purchased},'days')

That’s exactly what I needed. Thanks very much, @W_Vann_Hall. You’re aces!

There’s function WORKDAY_DIFF

Thanks so much @Martha_Creedon !! I searched google for the same problem and your response really helped me out quickly.

I am trying to get the numbers of days difference between a date cell and a formula cell using IF({Return Solved}=1, DATETIME_FORMAT(SET_TIMEZONE(NOW(), ‘New Zealand/Wellington’), ‘D/M/YYYY’))

I am trying to use DATETIME_DIFF({Date of Return}, {Date Resolved}, ‘days’) but it is not showing the correct amount of days?

Any ideas?

I just tried WORKDAY_DIFF({Date of Return}, {Date Resolved}) and now it is showing negative days?

This formula is what I’m looking for. However, I may not have a date in the second field and currently it returns NaN if something is missing in the secondary field. Is there anything that could be added to leave the field blank if there is nothing in that field. In the example above it would be if the {Date Purchased} was blank then the output would be left blank.

Thanks!

IF({Date Purchased}, DATETIME_DIFF({Date Depleted},{Date Purchased},'days'))