In this post we would learn how to get Days, Hours and Minutes in specified format when two datetime fields are subtracted in formula field in salesforce ?
Solution:
TEXT(
FLOOR((Now()- CreatedDate))
) & " Days " &
TEXT(
FLOOR(MOD(((Now()- CreatedDate))*24,24))
) &" Hours " &
TEXT(
ROUND(MOD(((Now()- CreatedDate))*24*60),0)
)
you can replace Now() and createddate according to your datetime fields which you want to get datetime from.