Struggling with a formula for counting difference between dates

[Matthew_Grundy]

Hello,

I’m trying to make a formula that counts the difference between start date and end date, however if end date is blank calculate the difference between start date, and current date.

Sorry if it sounds simple, i’m very new to airtable!

Thanks
Matt

[JonathanBowen · Accepted solution]

Hi @Matthew_Grundy - try this:

IF(
{End Date}, 
DATETIME_DIFF({End Date}, {Start Date}, 'days'), 
DATETIME_DIFF(TODAY(), {Start Date}, 'days')
) 

JB

[Justin_Barrett]

Here’s another way to write it, putting the IF function inside a single DATETIME_DIFF:

DATETIME_DIFF(IF({End Date}, {End Date}, TODAY()), {Start Date}, "days")

[Matthew_Grundy]

Works perfectly!
thank you for your help.

Matt