Supported DATETIME_DIFF unit specifiers in Airtable
 Airtable Fields › Formula › Formula Foundations › Working with dates 
Plan Availability   All plan types     Required permissions    Owner  /  Creator  - Can add, delete, duplicate, rename, and customize fields      Platform(s)   Web/Browser, Mac app, and Windows app (with some additional limited support on mobile)       DATETIME_DIFF() in Airtable overview  The DATETIME