/// <summary>
/// Adds nanoseconds to this instance of DateTime
/// </summary>
/// <param name="nanoseconds"></param>
/// <returns></returns>
public DateTime AddNanoseconds(double nanoseconds)
{
DateTime universal = ToUniversalTime();
DateTime result = universal.AddNanosecondsInternal(System.Math.Round(nanoseconds));
return(result.ToTimeZone(TimeZone));
}
/// <summary>
/// Adds a timespan to this instance of DateTime
/// </summary>
/// <param name="timeSpan"></param>
/// <returns></returns>
public DateTime Add(TimeSpan timeSpan)
{
DateTime result = new DateTime(Universal.Add(timeSpan.ToSystemTimeSpan()), m_nanosecond,
Type.TimeZone.UTC, true);
result = result.AddMicrosecondsInternal(timeSpan.Microseconds);
result = result.AddNanosecondsInternal(timeSpan.Nanoseconds);
return(result.ToTimeZone(TimeZone));
}
// All Add* methods that take a double as input split the value into its whole
// and fractional parts. The whole part can be added using the corresponding
// System.DateTime.Add* method, but the fractional part needs to be added using
// our own method so that microseconds and nanoseconds are updated.
/// <summary>
/// Adds days to this instance of DateTime
/// </summary>
/// <param name="days"></param>
/// <returns></returns>
public DateTime AddDays(double days)
{
DateTime universal = ToUniversalTime();
double whole = System.Math.Floor(days);
double fractional = days - whole;
DateTime result = universal.AddNanosecondsInternal
(fractional * DateTimeHelper.Days2Nanoseconds);
result = new DateTime(result.m_base.AddDays(whole), result.m_nanosecond, Type.TimeZone.UTC, true);
return(result.ToTimeZone(TimeZone));
}
/// <summary>
/// Adds microseconds to this instance of DateTime
/// </summary>
/// <param name="microseconds"></param>
/// <returns></returns>
public DateTime AddMicroseconds(double microseconds)
{
DateTime universal = ToUniversalTime();
double whole = System.Math.Floor(microseconds);
double fractional = microseconds - whole;
DateTime result = universal.AddNanosecondsInternal
(fractional * DateTimeHelper.Microseconds2Nanoseconds);
result = result.AddMicrosecondsInternal(whole);
return(result.ToTimeZone(TimeZone));
}