Date VS Date Time in Calculated Field

Question

I have a property for a patients records called Date of Birth. On the table defining it I saved it as a "date" type and It displays only
the date on the screen as I would like. For some reason though when I needed a calculated field in the Medication record I added a property to the patient records table that concatenated two fields BirthDate and the Age. I used the following code and then
added an other screen data item on the medication screen to pull the DoBA property up but got a Date/Time instead of just a Date.
partial void DoBA_Compute(ref string result)
// Set result to the desired field value
result = "DoB:" + BirthDate + " Age:" + Age;
//This is for the property "Date of Birth and Age"
//I also used the following code to calculate "Age"
partial void Age_Compute(ref int result)
// Set result to the desired field value
int age = DateTime.Now.Year - BirthDate.Year;
if (BirthDate > DateTime.Now.AddYears(-age)) age--;
result = age;
Images

Answer 1

I'm using cast instead of Convert.ToInt because the last round to value to upper int if value > 0.5 or to lower if value < 0.5 ( I don't remember now if equal goes to < or > ... read function doc ) while Cast to int do not round the value.
In my code the day of the birthday
still
marks
the
previous
age,
from the
day after
one more year.
by adding
+
1
age
increases
by the
day
of the birthday