Airtable formula to convert X calendar dates into number of days

[Elodie_Delneuf]

Hello,

I want to calculate the number of days of a mission,

• either from a period of time with beginning and end dates - which I can do with the [ DATETIME_DIFF() function]

• or (and this is where I have an issue), from a list of specific dates. I want to make the sum of theses days. What is the formula for that please?

[Databaser]

Hi @Elodie_Delneuf and welcome to the community!

Elodie_Delneuf:

from a list of specific dates

I’m assuming that this is a selection field and thus outputs a text, rather than a date. If that is the case, you could try using DATETIME_PARSE() in combination with a DATETIME_DIFF().