/// <summary>
/// Creates a new object that is a copy of the current instance.
/// <b>Note:</b> If the <seealso cref="Zmanim.TimeZone.ITimeZone"/> in the cloned
/// <see cref="GeoLocation"/> will be changed from the
/// original, it is critical that
/// <see cref="DateWithLocation"/>.
/// <see cref="TimeZone">TimeZone</see>
/// be set in order for the AstronomicalCalendar to output times in the
/// expected offset after being cloned.
/// </summary>
/// <returns>
/// A new object that is a copy of this instance.
/// </returns>
public virtual object Clone()
{
var clone = (AstronomicalCalendar)MemberwiseClone();
clone.DateWithLocation = (IDateWithLocation)DateWithLocation.Clone();
clone.AstronomicalCalculator = (AstronomicalCalculator)AstronomicalCalculator.Clone();
return(clone);
}
/// <summary>
/// A method that will roll the sunset time forward a day if sunset occurs
/// before sunrise. This will typically happen when a timezone other than the
/// local timezone is used (calculating Los Angeles sunset using a GMT
/// timezone for example). In this case the sunset date will be incremented
/// to the following date.
/// </summary>
/// <param name="sunset">the sunset date to adjust if needed</param>
/// <param name="sunrise">the sunrise to compare to the sunset</param>
/// <returns>
/// the adjusted sunset date.
/// If the calculation can't be computed such as in the Arctic
/// Circle where there is at least one day a year where the sun does
/// not rise, and one where it does not set, a null will be returned.
/// See detailed explanation on top of the page.
/// </returns>
private DateTime?GetAdjustedSunsetDate(DateTime?sunset, DateTime?sunrise)
{
if (sunset == null || sunrise == null || sunrise.Value.CompareTo(sunset) < 0)
{
return(sunset);
}
var clonedDateWithLocation = (IDateWithLocation)DateWithLocation.Clone();
clonedDateWithLocation.Date = sunset.Value;
clonedDateWithLocation.Date.AddDays(1);
return(clonedDateWithLocation.Date);
}