// Regner den nuværende alder ud fra fødselsdatoen til dagsdato.
public void calculateAgeFromBirthdate()
{
DateTimeSpan dateSpan = DateTimeSpan.CompareDates(this.birthdate, DateToday);
string AgeFormatted = "Years: " + dateSpan.Years + " Months: " + dateSpan.Months + " Days: " + dateSpan.Days;
this.age = AgeFormatted;
}
public void canCalculateAgeFromBirthdate()
{
Cow cow = new Cow();
cow.birthdate = new DateTime(2014, 10, 1);
cow.calculateAgeFromBirthdate();
DateTime DateToday = DateTime.Today;
DateTime Birthdate = new DateTime(2014, 10, 1);
DateTimeSpan dateSpan = DateTimeSpan.CompareDates(Birthdate, DateToday);
string dateSpanFormatted = "Years: " + dateSpan.Years + " Months: " + dateSpan.Months + " Days: " + dateSpan.Days;
Assert.AreEqual(dateSpanFormatted, cow.age);
}
public static DateTimeSpan CompareDates(DateTime date1, DateTime date2)
{
// Hvis date2 er en "mindre" date end date 1, så byt om på dem.
if (date2 < date1)
{
var sub = date1;
date1 = date2;
date2 = sub;
}
DateTime current = date1;
int years = 0;
int months = 0;
int days = 0;
Phase phase = Phase.Years;
DateTimeSpan span = new DateTimeSpan();
int officialDay = current.Day;
while (phase != Phase.Done)
{
switch (phase)
{
case Phase.Years:
if (current.AddYears(years + 1) > date2)
{
phase = Phase.Months;
current = current.AddYears(years);
}
else
{
years++;
}
break;
case Phase.Months:
if (current.AddMonths(months + 1) > date2)
{
phase = Phase.Days;
current = current.AddMonths(months);
if (current.Day < officialDay && officialDay <= DateTime.DaysInMonth(current.Year, current.Month))
{
current = current.AddDays(officialDay - current.Day);
}
}
else
{
months++;
}
break;
case Phase.Days:
if (current.AddDays(days + 1) > date2)
{
current = current.AddDays(days);
var timespan = date2 - current;
span = new DateTimeSpan(years, months, days, timespan.Hours, timespan.Minutes, timespan.Seconds, timespan.Milliseconds);
phase = Phase.Done;
}
else
{
days++;
}
break;
}
}
return(span);
}