/// <summary>
/// First day of week
/// </summary>
/// <param name="ld"></param>
/// <returns></returns>
public static LocalDate FirstDayOfWeek(this LocalDate ld)
{
var currentCulture = CultureInfo.CurrentCulture;
var firstDayOfWeek = (int)currentCulture.DateTimeFormat.FirstDayOfWeek;
var currentDayOfWeek = (int)ld.DayOfWeek;
var offset = currentDayOfWeek - firstDayOfWeek < 0 ? 7 : 0;
var numberOfDaysSinceBeginningOfTheWeek = currentDayOfWeek + offset - firstDayOfWeek;
return(ld.AddDays(-numberOfDaysSinceBeginningOfTheWeek));
}
public void Test__AddDays()
{
// Arrange
var localDate = new LocalDate(2010, 1, 2);
var expected = new LocalDate(2010, 1, 27);
// Act
localDate = localDate.AddDays(25) as LocalDate;
// Assert
Assert.Equal(expected, localDate);
}
/// <summary>
/// Previous Year
/// </summary>
/// <param name="ld"></param>
/// <returns></returns>
public static LocalDate PreviousYear(this LocalDate ld)
{
var year = ld.Year - 1;
var daysOfMonth = DateTime.DaysInMonth(year, ld.Month);
if (daysOfMonth == ld.Day)
{
return(new LocalDate(ld.Era, year, ld.Month, ld.Day));
}
var d = ld.Day - daysOfMonth;
var p = new LocalDate(ld.Era, year, ld.Month, daysOfMonth);
return(p.AddDays(d));
}
/// <summary> /// Next day /// </summary> /// <param name="ld"></param> /// <returns></returns> public static LocalDate NextDay(this LocalDate ld) => ld.AddDays(1);
/// <summary> /// Previous Day /// </summary> /// <param name="ld"></param> /// <returns></returns> public static LocalDate PreviousDay(this LocalDate ld) => ld.AddDays(-1);
public void Test_AddDays_Ok()
{
LocalDate localDate = new LocalDate(2019, Month.November, 5);
int daysToAdd = 3;
LocalDate localDateResult = new LocalDate(2019, Month.November, 8);
Assert.Equal(localDateResult, localDate.AddDays(daysToAdd));
localDate = new LocalDate(2019, Month.November, 5);
daysToAdd = 29;
localDateResult = new LocalDate(2019, Month.December, 4);
Assert.Equal(localDateResult, localDate.AddDays(daysToAdd));
localDate = new LocalDate(2019, Month.November, 5);
daysToAdd = 60;
localDateResult = new LocalDate(2020, Month.January, 4);
Assert.Equal(localDateResult, localDate.AddDays(daysToAdd));
localDate = new LocalDate(2019, Month.November, 5);
daysToAdd = -3;
localDateResult = new LocalDate(2019, Month.November, 2);
Assert.Equal(localDateResult, localDate.AddDays(daysToAdd));
localDate = new LocalDate(2019, Month.November, 5);
daysToAdd = -37;
localDateResult = new LocalDate(2019, Month.September, 29);
Assert.Equal(localDateResult, localDate.AddDays(daysToAdd));
localDate = new LocalDate(2020, Month.February, 28);
daysToAdd = 1;
localDateResult = new LocalDate(2020, Month.February, 29);
Assert.Equal(localDateResult, localDate.AddDays(daysToAdd));
localDate = new LocalDate(2020, Month.February, 28);
daysToAdd = 2;
localDateResult = new LocalDate(2020, Month.March, 1);
Assert.Equal(localDateResult, localDate.AddDays(daysToAdd));
localDate = new LocalDate(2019, Month.February, 28);
daysToAdd = 1;
localDateResult = new LocalDate(2019, Month.March, 1);
Assert.Equal(localDateResult, localDate.AddDays(daysToAdd));
localDate = new LocalDate(2020, Month.March, 1);
daysToAdd = -1;
localDateResult = new LocalDate(2020, Month.February, 29);
Assert.Equal(localDateResult, localDate.AddDays(daysToAdd));
localDate = new LocalDate(2019, Month.March, 1);
daysToAdd = -1;
localDateResult = new LocalDate(2019, Month.February, 28);
Assert.Equal(localDateResult, localDate.AddDays(daysToAdd));
}
