private static IAge CreateAge(AgeUnits unit, int first, int second)
{
switch (unit)
{
case AgeUnits.Year:
{
var age = new Age(first, InvalidAge, InvalidAge, InvalidAge, AgeUnits.Year);
return(age);
}
case AgeUnits.YearAndMonth:
{
var age = new Age(first, second, InvalidAge, InvalidAge, AgeUnits.YearAndMonth);
return(age);
}
case AgeUnits.MonthAndWeek:
{
var age = new Age(InvalidAge, first, second, InvalidAge, AgeUnits.MonthAndWeek);
return(age);
}
case AgeUnits.WeekAndDay:
{
var age = new Age(InvalidAge, InvalidAge, first, second, AgeUnits.WeekAndDay);
return(age);
}
}
return(null);
}
public void AgeWithUnits_ShouldSupportCalculatingAgeInSpecificUnits(AgeUnits units)
{
//Arrange
var date = DateTime.Now;
//Act
var age = date.Age(units);
//Assert
age.GetType().ShouldBe(typeof(int));
}
/// <summary>
/// Calculate age of object in certain units.
/// </summary>
/// <param name="startDate">Start date.</param>
/// <param name="units">Units of age measurement.</param>
/// <returns>Age in specific units.</returns>
/// <exception cref="ArgumentOutOfRangeException"></exception>
public static int Age(this DateTime startDate, AgeUnits units)
{
if (DateTime.Now < startDate)
{
throw new ArgumentOutOfRangeException(nameof(startDate));
}
var zeroTime = new DateTime(1, 1, 1);
var span = zeroTime + (DateTime.Now - startDate);
return(units switch
{
AgeUnits.Year => span.Year - 1,
AgeUnits.Month => span.Month - 1,
AgeUnits.Week => span.Day % 7 - 1,
AgeUnits.Day => span.Day - 1,
AgeUnits.Hour => span.Hour - 1,
AgeUnits.Minute => span.Minute - 1,
AgeUnits.Second => span.Second - 1,
_ => throw new ArgumentException(nameof(startDate)),
});
public Age(int value, AgeUnits ageUnits)
{
Value = value;
Units = ageUnits;
}
