static int AgeDifference(AgeRangeType ageType, System.DateTime startDate, System.DateTime endDate)
{
int diff = 0;
var ageInYears = endDate.Year - startDate.Year;
if (startDate > endDate.AddYears(-ageInYears))
ageInYears -= 1;
var newStart = startDate.AddYears(ageInYears);
switch (ageType) {
case AgeRangeType.Months:
var monthsOld = 0;
while (newStart.AddMonths(monthsOld + 1) <= endDate.Date) {
monthsOld++;
}
diff = ageInYears * 12 + monthsOld;
break;
case AgeRangeType.Weeks:
var TS = endDate.Date - newStart.Date;
diff = ageInYears * 52 + (TS.Days / 7);
break;
default:
var age = endDate.Year - startDate.Year;
if (startDate > endDate.AddYears(-age))
age -= 1;
diff = age;
break;
}
return diff;
}
static int OriginalAgeDifference(AgeRangeType ageType, System.DateTime startDate, System.DateTime endDate)
{
double diff = 0.0;
System.TimeSpan TS = new System.TimeSpan(endDate.Ticks - startDate.Ticks);
switch (ageType) {
case AgeRangeType.Months:
diff = TS.TotalDays / 365 * 12;
break;
case AgeRangeType.Weeks:
diff = TS.TotalDays / 365 * 52;
break;
default:
diff = TS.TotalDays / 365;
break;
}
return (int)diff; // return Math.floor
}
