reference:evaluator:datediff

DateDiff(
     string:units,
     date:date1,
     date:date2
)
→ int

Unit type to return. Valid unit types are:

yyyy	Years
q	Quarter years
m	Months
y	Days
d	Days
w	Whole weeks
ww	Calendar weeks (number of Sundays)
h	Hours
n	Minutes
s	Seconds

The first date.

The second date.

Difference between the two dates.

Returns the difference between the two supplied dates, expressed as units.

Example:

Output(DateDiff("yyyy", "2021-01-01", "2023-01-01"))
--> 2