public static void ComparisonsTest()
{
DateOnly dateOnly1 = DateOnly.FromDateTime(DateTime.Today);
DateOnly dateOnly2 = DateOnly.FromDateTime(DateTime.Today);
DateOnly dateOnly3 = dateOnly1.AddYears(-10);
Assert.Equal(0, dateOnly1.CompareTo(dateOnly2));
Assert.True(dateOnly1.Equals(dateOnly2));
Assert.True(dateOnly1.Equals((object)dateOnly2));
Assert.Equal(0, dateOnly2.CompareTo(dateOnly1));
Assert.True(dateOnly2.Equals(dateOnly1));
Assert.True(dateOnly2.Equals((object)dateOnly1));
Assert.Equal(1, dateOnly1.CompareTo(dateOnly3));
Assert.False(dateOnly1.Equals(dateOnly3));
Assert.False(dateOnly1.Equals((object)dateOnly3));
Assert.Equal(-1, dateOnly3.CompareTo(dateOnly1));
Assert.False(dateOnly3.Equals(dateOnly1));
Assert.False(dateOnly3.Equals((object)dateOnly1));
Assert.Equal(0, dateOnly1.CompareTo((object)dateOnly2));
Assert.Equal(0, dateOnly2.CompareTo((object)dateOnly1));
Assert.Equal(1, dateOnly1.CompareTo((object)dateOnly3));
Assert.Equal(-1, dateOnly3.CompareTo((object)dateOnly1));
Assert.Equal(1, dateOnly1.CompareTo(null));
Assert.Throws <ArgumentException>(() => dateOnly1.CompareTo(new object()));
Assert.False(dateOnly3.Equals(new object()));
}
public static int YearsTo(this DateOnly start, DateOnly end)
{
int result = end.Year - start.Year;
if (end < start.AddYears(result))
{
result--;
}
return(result);
}
public static void AddYearsTest()
{
DateOnly dateOnly = new DateOnly(2021, 1, 31);
for (int i = 2021; i < 2040; i++)
{
Assert.Equal(i, dateOnly.Year);
dateOnly = dateOnly.AddYears(1);
}
for (int i = dateOnly.Year; i > 2020; i--)
{
Assert.Equal(i, dateOnly.Year);
dateOnly = dateOnly.AddYears(-1);
}
DateTime dt = DateTime.Today;
dateOnly = DateOnly.FromDayNumber((int)(dt.Ticks / TimeSpan.TicksPerDay));
Assert.Equal(dt.Year, dateOnly.Year);
Assert.Equal(dt.Month, dateOnly.Month);
Assert.Equal(dt.Day, dateOnly.Day);
dt = dt.AddYears(1);
dateOnly = dateOnly.AddYears(1);
Assert.Equal(dt.Year, dateOnly.Year);
dt = dt.AddYears(50);
dateOnly = dateOnly.AddYears(50);
Assert.Equal(dt.Year, dateOnly.Year);
dt = dt.AddYears(-150);
dateOnly = dateOnly.AddYears(-150);
Assert.Equal(dt.Year, dateOnly.Year);
Assert.Throws <ArgumentOutOfRangeException>(() => DateOnly.MinValue.AddYears(-1));
Assert.Throws <ArgumentOutOfRangeException>(() => DateOnly.MaxValue.AddYears(1));
}
/// <summary>
/// 1 years from the provided date
/// </summary>
public static DateOnly YearFrom(DateOnly date)
{
return(date.AddYears(1));
}
