| public Subtract ( System.DateTime start, System.TimeSpan offset, SeekBoundaryMode seekBoundaryMode = SeekBoundaryMode.Next ) : DateTime? | ||
| start | System.DateTime | 시작 시각 |
| offset | System.TimeSpan | 기간(Duration) |
| seekBoundaryMode | SeekBoundaryMode | 검색시 경계에 대한 모드 |
| return | DateTime? | |
public void PeriodLimitsSubtractTest() {
var test = new DateTime(2011, 4, 30);
var timeRange1 = new TimeRange(new DateTime(2011, 4, 20), new DateTime(2011, 4, 25));
var timeRange2 = new TimeRange(DateTime.MinValue, new DateTime(2011, 4, 6));
var dateAdd = new DateAdd();
// 예외 기간을 설정합니다. 4월 10일 이전, 4월20일 ~ 4월25일
//
dateAdd.ExcludePeriods.Add(timeRange1);
dateAdd.ExcludePeriods.Add(timeRange2);
dateAdd.Subtract(test, DurationUtil.Days(1)).Should().Be(test.Subtract(DurationUtil.Days(1)));
//! 4월 30일로부터 5일전이면 4월25일이지만, 예외기간이 4월20일~4월25일이므로, 4월20일을 반환합니다.
//
dateAdd.Subtract(test, DurationUtil.Days(5)).Should().Be(timeRange1.Start);
//! 4월 30일로부터 20일전이면, 4월10일 이지만 예외기간이 4월20일~4월25일이 있어 4월 5일이 되지만 4월 6일 이전은 예외기간이라 null을 반환합니다.
//
dateAdd.Subtract(test, DurationUtil.Days(20)).HasValue.Should().Be.False();
dateAdd.Add(test, DurationUtil.Days(3)).Should().Be(test.Add(DurationUtil.Days(3)));
}
public void PeriodLimitsSubtractTest()
{
var test = new DateTime(2011, 4, 30);
var timeRange1 = new TimeRange(new DateTime(2011, 4, 20), new DateTime(2011, 4, 25));
var timeRange2 = new TimeRange(DateTime.MinValue, new DateTime(2011, 4, 6));
var dateAdd = new DateAdd();
// 예외 기간을 설정합니다. 4월 10일 이전, 4월20일 ~ 4월25일
//
dateAdd.ExcludePeriods.Add(timeRange1);
dateAdd.ExcludePeriods.Add(timeRange2);
dateAdd.Subtract(test, DurationUtil.Days(1)).Should().Be(test.Subtract(DurationUtil.Days(1)));
//! 4월 30일로부터 5일전이면 4월25일이지만, 예외기간이 4월20일~4월25일이므로, 4월20일을 반환합니다.
//
dateAdd.Subtract(test, DurationUtil.Days(5)).Should().Be(timeRange1.Start);
//! 4월 30일로부터 20일전이면, 4월10일 이지만 예외기간이 4월20일~4월25일이 있어 4월 5일이 되지만 4월 6일 이전은 예외기간이라 null을 반환합니다.
//
dateAdd.Subtract(test, DurationUtil.Days(20)).HasValue.Should().Be.False();
dateAdd.Add(test, DurationUtil.Days(3)).Should().Be(test.Add(DurationUtil.Days(3)));
}
public void NoPeriodsTest() {
var test = new DateTime(2011, 4, 12);
var dateAdd = new DateAdd();
dateAdd.Add(test, DurationUtil.Zero).Should().Be(test);
dateAdd.Add(test, DurationUtil.Days(1)).Should().Be(test.AddDays(1));
dateAdd.Add(test, DurationUtil.Days(-1)).Should().Be(test.AddDays(-1));
dateAdd.Subtract(test, DurationUtil.Days(1)).Should().Be(test.AddDays(-1));
dateAdd.Subtract(test, DurationUtil.Days(-1)).Should().Be(test.AddDays(1));
}
public void NoPeriodsTest()
{
var test = new DateTime(2011, 4, 12);
var dateAdd = new DateAdd();
dateAdd.Add(test, DurationUtil.Zero).Should().Be(test);
dateAdd.Add(test, DurationUtil.Days(1)).Should().Be(test.AddDays(1));
dateAdd.Add(test, DurationUtil.Days(-1)).Should().Be(test.AddDays(-1));
dateAdd.Subtract(test, DurationUtil.Days(1)).Should().Be(test.AddDays(-1));
dateAdd.Subtract(test, DurationUtil.Days(-1)).Should().Be(test.AddDays(1));
}
public void IncludeOutsideMinTest()
{
var test = new DateTime(2011, 4, 12);
var timeRange = new TimeRange(DateTime.MinValue, new DateTime(2011, 4, 10));
var dateAdd = new DateAdd();
dateAdd.IncludePeriods.Add(timeRange);
dateAdd.Add(test, DurationUtil.Zero).Should().Not.Have.Value();
dateAdd.Add(test, DurationUtil.Days(1)).Should().Not.Have.Value();
dateAdd.Subtract(test, DurationUtil.Zero).Should().Be(timeRange.End);
dateAdd.Subtract(test, DurationUtil.Days(1)).Should().Be(timeRange.End.AddDays(-1));
}
public void IncludeOutsideMaxTest()
{
var test = new DateTime(2011, 4, 12);
var timeRange = new TimeRange(new DateTime(2011, 4, 20), DateTime.MaxValue);
var dateAdd = new DateAdd();
dateAdd.IncludePeriods.Add(timeRange);
dateAdd.Add(test, DurationUtil.Zero).Should().Be(timeRange.Start);
dateAdd.Add(test, DurationUtil.Days(1)).Should().Be(timeRange.Start.AddDays(1));
dateAdd.Subtract(test, DurationUtil.Zero).Should().Not.Have.Value();
dateAdd.Subtract(test, DurationUtil.Days(1)).Should().Not.Have.Value();
}
public void IncludeEqualsExcludeTest()
{
var dateAdd = new DateAdd();
dateAdd.IncludePeriods.Add(new TimeRange(new DateTime(2011, 3, 5), new DateTime(2011, 3, 10)));
dateAdd.ExcludePeriods.Add(new TimeRange(new DateTime(2011, 3, 5), new DateTime(2011, 3, 10)));
var test = new DateTime(2011, 3, 5);
Assert.IsNull(dateAdd.Add(test, TimeSpan.Zero));
Assert.IsNull(dateAdd.Add(test, new TimeSpan(1)));
Assert.IsNull(dateAdd.Add(test, new TimeSpan(-1)));
Assert.IsNull(dateAdd.Subtract(test, TimeSpan.Zero));
Assert.IsNull(dateAdd.Subtract(test, new TimeSpan(1)));
Assert.IsNull(dateAdd.Subtract(test, new TimeSpan(-1)));
}
public void PeriodLimitsAddTest()
{
var test = new DateTime(2011, 4, 12);
var timeRange1 = new TimeRange(new DateTime(2011, 4, 20), new DateTime(2011, 4, 25)); // 4월 20일~4월25일
var timeRange2 = new TimeRange(new DateTime(2011, 4, 30), null); // 4월 30일 이후
var dateAdd = new DateAdd();
// 예외 기간을 설정합니다. 4월20일 ~ 4월25일, 4월30일 이후
//
dateAdd.ExcludePeriods.Add(timeRange1);
dateAdd.ExcludePeriods.Add(timeRange2);
dateAdd.Add(test, DurationUtil.Day).Should().Be(test.Add(DurationUtil.Day));
//! 4월 12일에 8일을 더하면 4월 20일이지만, 20~25일까지 제외되므로, 4월 25일이 된다.
//
dateAdd.Add(test, DurationUtil.Days(8)).Should().Be(timeRange1.End);
//! 4월 20일에 20일을 더하면, 4월 20~25일 제외 후를 계산하면 4월 30일 이후가 된다. 하지만 4월 30일 이후는 제외가 되므로, 결과값은 null이 된다.
//
dateAdd.Add(test, DurationUtil.Days(20)).HasValue.Should().Be.False();
dateAdd.Subtract(test, DurationUtil.Days(3)).Should().Be(test.Subtract(DurationUtil.Days(3)));
}
public void PeriodLimitsAddTest() {
var test = new DateTime(2011, 4, 12);
var timeRange1 = new TimeRange(new DateTime(2011, 4, 20), new DateTime(2011, 4, 25)); // 4월 20일~4월25일
var timeRange2 = new TimeRange(new DateTime(2011, 4, 30), null); // 4월 30일 이후
var dateAdd = new DateAdd();
// 예외 기간을 설정합니다. 4월20일 ~ 4월25일, 4월30일 이후
//
dateAdd.ExcludePeriods.Add(timeRange1);
dateAdd.ExcludePeriods.Add(timeRange2);
dateAdd.Add(test, DurationUtil.Day).Should().Be(test.Add(DurationUtil.Day));
//! 4월 12일에 8일을 더하면 4월 20일이지만, 20~25일까지 제외되므로, 4월 25일이 된다.
//
dateAdd.Add(test, DurationUtil.Days(8)).Should().Be(timeRange1.End);
//! 4월 20일에 20일을 더하면, 4월 20~25일 제외 후를 계산하면 4월 30일 이후가 된다. 하지만 4월 30일 이후는 제외가 되므로, 결과값은 null이 된다.
//
dateAdd.Add(test, DurationUtil.Days(20)).HasValue.Should().Be.False();
dateAdd.Subtract(test, DurationUtil.Days(3)).Should().Be(test.Subtract(DurationUtil.Days(3)));
}
public void IncludeExclude3Test()
{
var dateAdd = new DateAdd();
dateAdd.ExcludePeriods.Add(new TimeRange(new DateTime(2011, 3, 5), new DateTime(2011, 3, 10)));
dateAdd.IncludePeriods.Add(new TimeRange(new DateTime(2011, 3, 10), new DateTime(2011, 3, 15)));
dateAdd.ExcludePeriods.Add(new TimeRange(new DateTime(2011, 3, 15), new DateTime(2011, 3, 20)));
var test = new DateTime(2011, 3, 10);
dateAdd.Subtract(test, TimeSpan.Zero).Should().Be(test);
dateAdd.Add(test, DurationUtil.Days(1)).Should().Be(new DateTime(2011, 3, 11));
dateAdd.Add(test, DurationUtil.Days(5), SeekBoundaryMode.Fill).Should().Be(test.AddDays(5));
dateAdd.Add(test, DurationUtil.Days(5)).Should().Not.Have.Value();
}
public void IncludeExclude2Test()
{
var dateAdd = new DateAdd();
dateAdd.IncludePeriods.Add(new TimeRange(new DateTime(2011, 3, 1), new DateTime(2011, 3, 5)));
dateAdd.ExcludePeriods.Add(new TimeRange(new DateTime(2011, 3, 5), new DateTime(2011, 3, 10)));
dateAdd.IncludePeriods.Add(new TimeRange(new DateTime(2011, 3, 10), new DateTime(2011, 3, 15)));
dateAdd.ExcludePeriods.Add(new TimeRange(new DateTime(2011, 3, 15), new DateTime(2011, 3, 20)));
dateAdd.IncludePeriods.Add(new TimeRange(new DateTime(2011, 3, 20), new DateTime(2011, 3, 25)));
var periodStart = new DateTime(2011, 3, 1);
var periodEnd = new DateTime(2011, 3, 25);
// add from start
dateAdd.Add(periodStart, TimeSpan.Zero).Should().Be(periodStart);
dateAdd.Add(periodStart, DurationUtil.Days(1)).Should().Be(new DateTime(2011, 3, 2));
dateAdd.Add(periodStart, DurationUtil.Days(3)).Should().Be(new DateTime(2011, 3, 4));
dateAdd.Add(periodStart, DurationUtil.Days(4)).Should().Be(new DateTime(2011, 3, 10));
dateAdd.Add(periodStart, DurationUtil.Days(5)).Should().Be(new DateTime(2011, 3, 11));
dateAdd.Add(periodStart, DurationUtil.Days(8)).Should().Be(new DateTime(2011, 3, 14));
dateAdd.Add(periodStart, DurationUtil.Days(9)).Should().Be(new DateTime(2011, 3, 20));
dateAdd.Add(periodStart, DurationUtil.Days(10)).Should().Be(new DateTime(2011, 3, 21));
dateAdd.Add(periodStart, DurationUtil.Days(14), SeekBoundaryMode.Fill).Should().Be(new DateTime(2011, 3, 25));
dateAdd.Add(periodStart, DurationUtil.Days(14), SeekBoundaryMode.Next).Should().Not.Have.Value();
dateAdd.Add(periodStart, DurationUtil.Days(14)).Should().Not.Have.Value();
// add from end
dateAdd.Add(periodEnd, TimeSpan.Zero).Should().Be(periodEnd);
dateAdd.Add(periodEnd, DurationUtil.Days(-1)).Should().Be(periodEnd.AddDays(-1));
dateAdd.Add(periodEnd, DurationUtil.Days(-5)).Should().Be(new DateTime(2011, 3, 15));
dateAdd.Add(periodEnd, DurationUtil.Days(-6)).Should().Be(new DateTime(2011, 3, 14));
dateAdd.Add(periodEnd, DurationUtil.Days(-10)).Should().Be(new DateTime(2011, 3, 5));
dateAdd.Add(periodEnd, DurationUtil.Days(-11)).Should().Be(new DateTime(2011, 3, 4));
dateAdd.Add(periodEnd, DurationUtil.Days(-14), SeekBoundaryMode.Fill).Should().Be(new DateTime(2011, 3, 1));
dateAdd.Add(periodEnd, DurationUtil.Days(-14), SeekBoundaryMode.Next).Should().Not.Have.Value();
dateAdd.Add(periodEnd, DurationUtil.Days(-14)).Should().Not.Have.Value();
// subtract form end
dateAdd.Subtract(periodEnd, TimeSpan.Zero).Should().Be(periodEnd);
dateAdd.Subtract(periodEnd, DurationUtil.Days(1)).Should().Be(periodEnd.AddDays(-1));
dateAdd.Subtract(periodEnd, DurationUtil.Days(5)).Should().Be(new DateTime(2011, 3, 15));
dateAdd.Subtract(periodEnd, DurationUtil.Days(6)).Should().Be(new DateTime(2011, 3, 14));
dateAdd.Subtract(periodEnd, DurationUtil.Days(10)).Should().Be(new DateTime(2011, 3, 5));
dateAdd.Subtract(periodEnd, DurationUtil.Days(11)).Should().Be(new DateTime(2011, 3, 4));
dateAdd.Subtract(periodEnd, DurationUtil.Days(14), SeekBoundaryMode.Fill).Should().Be(new DateTime(2011, 3, 1));
dateAdd.Subtract(periodEnd, DurationUtil.Days(14), SeekBoundaryMode.Next).Should().Not.Have.Value();
dateAdd.Subtract(periodEnd, DurationUtil.Days(14)).Should().Not.Have.Value();
// subtract form start
dateAdd.Subtract(periodStart, TimeSpan.Zero).Should().Be(periodStart);
dateAdd.Subtract(periodStart, DurationUtil.Days(-1)).Should().Be(new DateTime(2011, 3, 2));
dateAdd.Subtract(periodStart, DurationUtil.Days(-3)).Should().Be(new DateTime(2011, 3, 4));
dateAdd.Subtract(periodStart, DurationUtil.Days(-4)).Should().Be(new DateTime(2011, 3, 10));
dateAdd.Subtract(periodStart, DurationUtil.Days(-5)).Should().Be(new DateTime(2011, 3, 11));
dateAdd.Subtract(periodStart, DurationUtil.Days(-8)).Should().Be(new DateTime(2011, 3, 14));
dateAdd.Subtract(periodStart, DurationUtil.Days(-9)).Should().Be(new DateTime(2011, 3, 20));
dateAdd.Subtract(periodStart, DurationUtil.Days(-10)).Should().Be(new DateTime(2011, 3, 21));
dateAdd.Subtract(periodStart, DurationUtil.Days(-14), SeekBoundaryMode.Fill).Should().Be(new DateTime(2011, 3, 25));
dateAdd.Subtract(periodStart, DurationUtil.Days(-14), SeekBoundaryMode.Next).Should().Not.Have.Value();
dateAdd.Subtract(periodStart, DurationUtil.Days(-14)).Should().Not.Have.Value();
}
public void IncludeOutsideMinTest() {
var test = new DateTime(2011, 4, 12);
var timeRange = new TimeRange(DateTime.MinValue, new DateTime(2011, 4, 10));
var dateAdd = new DateAdd();
dateAdd.IncludePeriods.Add(timeRange);
dateAdd.Add(test, DurationUtil.Zero).Should().Not.Have.Value();
dateAdd.Add(test, DurationUtil.Days(1)).Should().Not.Have.Value();
dateAdd.Subtract(test, DurationUtil.Zero).Should().Be(timeRange.End);
dateAdd.Subtract(test, DurationUtil.Days(1)).Should().Be(timeRange.End.AddDays(-1));
}
public void IncludeOutsideMaxTest() {
var test = new DateTime(2011, 4, 12);
var timeRange = new TimeRange(new DateTime(2011, 4, 20), DateTime.MaxValue);
var dateAdd = new DateAdd();
dateAdd.IncludePeriods.Add(timeRange);
dateAdd.Add(test, DurationUtil.Zero).Should().Be(timeRange.Start);
dateAdd.Add(test, DurationUtil.Days(1)).Should().Be(timeRange.Start.AddDays(1));
dateAdd.Subtract(test, DurationUtil.Zero).Should().Not.Have.Value();
dateAdd.Subtract(test, DurationUtil.Days(1)).Should().Not.Have.Value();
}
public void IncludeExclude5Test() {
var dateAdd = new DateAdd();
dateAdd.IncludePeriods.Add(new TimeRange(new DateTime(2011, 3, 10), new DateTime(2011, 3, 20)));
dateAdd.ExcludePeriods.Add(new TimeRange(new DateTime(2011, 3, 5), new DateTime(2011, 3, 15)));
dateAdd.ExcludePeriods.Add(new TimeRange(new DateTime(2011, 3, 15), new DateTime(2011, 3, 30)));
var test = new DateTime(2011, 3, 10);
Assert.IsNull(dateAdd.Add(test, TimeSpan.Zero));
Assert.IsNull(dateAdd.Add(test, new TimeSpan(1)));
Assert.IsNull(dateAdd.Add(test, new TimeSpan(-1)));
Assert.IsNull(dateAdd.Subtract(test, TimeSpan.Zero));
Assert.IsNull(dateAdd.Subtract(test, new TimeSpan(1)));
Assert.IsNull(dateAdd.Subtract(test, new TimeSpan(-1)));
}
public void IncludeExclude3Test() {
var dateAdd = new DateAdd();
dateAdd.ExcludePeriods.Add(new TimeRange(new DateTime(2011, 3, 5), new DateTime(2011, 3, 10)));
dateAdd.IncludePeriods.Add(new TimeRange(new DateTime(2011, 3, 10), new DateTime(2011, 3, 15)));
dateAdd.ExcludePeriods.Add(new TimeRange(new DateTime(2011, 3, 15), new DateTime(2011, 3, 20)));
var test = new DateTime(2011, 3, 10);
dateAdd.Subtract(test, TimeSpan.Zero).Should().Be(test);
dateAdd.Add(test, DurationUtil.Days(1)).Should().Be(new DateTime(2011, 3, 11));
dateAdd.Add(test, DurationUtil.Days(5), SeekBoundaryMode.Fill).Should().Be(test.AddDays(5));
dateAdd.Add(test, DurationUtil.Days(5)).Should().Not.Have.Value();
}
public void IncludeExclude2Test() {
var dateAdd = new DateAdd();
dateAdd.IncludePeriods.Add(new TimeRange(new DateTime(2011, 3, 1), new DateTime(2011, 3, 5)));
dateAdd.ExcludePeriods.Add(new TimeRange(new DateTime(2011, 3, 5), new DateTime(2011, 3, 10)));
dateAdd.IncludePeriods.Add(new TimeRange(new DateTime(2011, 3, 10), new DateTime(2011, 3, 15)));
dateAdd.ExcludePeriods.Add(new TimeRange(new DateTime(2011, 3, 15), new DateTime(2011, 3, 20)));
dateAdd.IncludePeriods.Add(new TimeRange(new DateTime(2011, 3, 20), new DateTime(2011, 3, 25)));
var periodStart = new DateTime(2011, 3, 1);
var periodEnd = new DateTime(2011, 3, 25);
// add from start
dateAdd.Add(periodStart, TimeSpan.Zero).Should().Be(periodStart);
dateAdd.Add(periodStart, DurationUtil.Days(1)).Should().Be(new DateTime(2011, 3, 2));
dateAdd.Add(periodStart, DurationUtil.Days(3)).Should().Be(new DateTime(2011, 3, 4));
dateAdd.Add(periodStart, DurationUtil.Days(4)).Should().Be(new DateTime(2011, 3, 10));
dateAdd.Add(periodStart, DurationUtil.Days(5)).Should().Be(new DateTime(2011, 3, 11));
dateAdd.Add(periodStart, DurationUtil.Days(8)).Should().Be(new DateTime(2011, 3, 14));
dateAdd.Add(periodStart, DurationUtil.Days(9)).Should().Be(new DateTime(2011, 3, 20));
dateAdd.Add(periodStart, DurationUtil.Days(10)).Should().Be(new DateTime(2011, 3, 21));
dateAdd.Add(periodStart, DurationUtil.Days(14), SeekBoundaryMode.Fill).Should().Be(new DateTime(2011, 3, 25));
dateAdd.Add(periodStart, DurationUtil.Days(14), SeekBoundaryMode.Next).Should().Not.Have.Value();
dateAdd.Add(periodStart, DurationUtil.Days(14)).Should().Not.Have.Value();
// add from end
dateAdd.Add(periodEnd, TimeSpan.Zero).Should().Be(periodEnd);
dateAdd.Add(periodEnd, DurationUtil.Days(-1)).Should().Be(periodEnd.AddDays(-1));
dateAdd.Add(periodEnd, DurationUtil.Days(-5)).Should().Be(new DateTime(2011, 3, 15));
dateAdd.Add(periodEnd, DurationUtil.Days(-6)).Should().Be(new DateTime(2011, 3, 14));
dateAdd.Add(periodEnd, DurationUtil.Days(-10)).Should().Be(new DateTime(2011, 3, 5));
dateAdd.Add(periodEnd, DurationUtil.Days(-11)).Should().Be(new DateTime(2011, 3, 4));
dateAdd.Add(periodEnd, DurationUtil.Days(-14), SeekBoundaryMode.Fill).Should().Be(new DateTime(2011, 3, 1));
dateAdd.Add(periodEnd, DurationUtil.Days(-14), SeekBoundaryMode.Next).Should().Not.Have.Value();
dateAdd.Add(periodEnd, DurationUtil.Days(-14)).Should().Not.Have.Value();
// subtract form end
dateAdd.Subtract(periodEnd, TimeSpan.Zero).Should().Be(periodEnd);
dateAdd.Subtract(periodEnd, DurationUtil.Days(1)).Should().Be(periodEnd.AddDays(-1));
dateAdd.Subtract(periodEnd, DurationUtil.Days(5)).Should().Be(new DateTime(2011, 3, 15));
dateAdd.Subtract(periodEnd, DurationUtil.Days(6)).Should().Be(new DateTime(2011, 3, 14));
dateAdd.Subtract(periodEnd, DurationUtil.Days(10)).Should().Be(new DateTime(2011, 3, 5));
dateAdd.Subtract(periodEnd, DurationUtil.Days(11)).Should().Be(new DateTime(2011, 3, 4));
dateAdd.Subtract(periodEnd, DurationUtil.Days(14), SeekBoundaryMode.Fill).Should().Be(new DateTime(2011, 3, 1));
dateAdd.Subtract(periodEnd, DurationUtil.Days(14), SeekBoundaryMode.Next).Should().Not.Have.Value();
dateAdd.Subtract(periodEnd, DurationUtil.Days(14)).Should().Not.Have.Value();
// subtract form start
dateAdd.Subtract(periodStart, TimeSpan.Zero).Should().Be(periodStart);
dateAdd.Subtract(periodStart, DurationUtil.Days(-1)).Should().Be(new DateTime(2011, 3, 2));
dateAdd.Subtract(periodStart, DurationUtil.Days(-3)).Should().Be(new DateTime(2011, 3, 4));
dateAdd.Subtract(periodStart, DurationUtil.Days(-4)).Should().Be(new DateTime(2011, 3, 10));
dateAdd.Subtract(periodStart, DurationUtil.Days(-5)).Should().Be(new DateTime(2011, 3, 11));
dateAdd.Subtract(periodStart, DurationUtil.Days(-8)).Should().Be(new DateTime(2011, 3, 14));
dateAdd.Subtract(periodStart, DurationUtil.Days(-9)).Should().Be(new DateTime(2011, 3, 20));
dateAdd.Subtract(periodStart, DurationUtil.Days(-10)).Should().Be(new DateTime(2011, 3, 21));
dateAdd.Subtract(periodStart, DurationUtil.Days(-14), SeekBoundaryMode.Fill).Should().Be(new DateTime(2011, 3, 25));
dateAdd.Subtract(periodStart, DurationUtil.Days(-14), SeekBoundaryMode.Next).Should().Not.Have.Value();
dateAdd.Subtract(periodStart, DurationUtil.Days(-14)).Should().Not.Have.Value();
}
