Func

Func<dataType> means a method that returns a dataType.
Func<Date> means a method that return Date
Func<Number> means a method that return Number
Func<Time> means a method that return Time
Func<Text> means a method that return Text
Func<Bool> means a method that return Bool
see Func Power Point Presentation
Bind the value of the DaysBetween Column, Use Visual Studio's "Generate Method" factoring to create it.

public class DemoLocalColumns : UIControllerBase
{
    public readonly DateColumn FromDate = new DateColumn("From Date");
    public readonly DateColumn ToDate = new DateColumn("To Date");
    public readonly NumberColumn DaysBetween = new NumberColumn("Days Between","5CN");

    public DemoLocalColumns()
    {
        ToDate.BindValue(GetEndOfMonthOfFromDate);
        DaysBetween.BindValue(GetDaysBetween);
    }
    public Number GetDaysBetween()
    {
        return ToDate - FromDate;
    }
    public Date GetEndOfMonthOfFromDate()
    {
        return FromDate.EndOfMonth;
    }
  ...
}

Use C#6 style methods to write shorter code

public class DemoLocalColumns : UIControllerBase
{
    public readonly DateColumn FromDate = new DateColumn("From Date");
    public readonly DateColumn ToDate = new DateColumn("To Date");
    public readonly NumberColumn DaysBetween = new NumberColumn("Days Between","5CN");

    public DemoLocalColumns()
    {
        ToDate.BindValue(GetEndOfMonthOfFromDate);
        DaysBetween.BindValue(GetDaysBetween);
    }
    public Number GetDaysBetween() => ToDate - FromDate;

    public Date GetEndOfMonthOfFromDate() => FromDate.EndOfMonth;
  ...
}

For a deeper discussion of these topics see Lambda Expressions Generics and BindValue

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