NSDate Function cant accept a null value

Question

Is there a way to make this function accept a null datetime ?. By that I mean ToNSDate I have attempted it with my overide method but when I simply place Datetime? in an overide obv TotalSeconds does not exist.

namespace Microsoft.Maui
{
  public static class DateExtensions
  {
    internal static DateTime ReferenceDate = new DateTime(2001, 1, 1, 0, 0, 0);

    public static DateTime ToDateTime(this NSDate date)
    {
        return ReferenceDate.AddSeconds(date.SecondsSinceReferenceDate);
    }

    public static NSDate ToNSDate(this DateTime? date)
    {   
       return NSDate.FromTimeIntervalSinceReferenceDate((date - ReferenceDate).TotalSeconds);           
    }

     public static NSDate ToNSDate(this DateTime date)
     {  
       return NSDate.FromTimeIntervalSinceReferenceDate((date - ReferenceDate).TotalSeconds);           
     }
 }
}

I called like this from the function

public static void UpdateDate(this MauiDatePicker nativeDatePicker, IDatePicker datePicker, UIDatePicker? picker)
{
            if (picker != null && picker.Date.ToDateTime().Date != datePicker.Date?.Date)
                picker.SetDate(datePicker.Date.ToNSDate(), false);

            nativeDatePicker.Text = datePicker.Date?.ToString(datePicker.Format);

            nativeDatePicker.UpdateCharacterSpacing(datePicker);
}

Answer 1

Try making a single function instead of two:

public static NSDate ToNSDate( this DateTime? date )
{
   if( date == null ) return null;

   return NSDate.FromTimeIntervalSinceReferenceDate( ( date.Value - ReferenceDate ).TotalSeconds );
}