DaySpan in moment.js

README.md

Both implementations must return 1.5

From date = 01/01/2000

To date = 02/01/2000 12:00:00

Fractional days difference = 1.5 days

http://www.delphibasics.co.uk/RTL.asp?Name=DaySpan&ExpandCode1=Yes

sample.js

var a = '01/01/2000 00:00:00'
var b = '02/01/2000 12:00:00'
var f = 'DD/MM/YYYY HH:mm:ss';
var a1 = moment(a,f);
var b1 = moment(b,f);
console.log(`From date = ` + a);
console.log(`To date = ` + b);
console.log(`Fractional days difference = ${b1.diff(a1,'days', true)} days`);

sample.pas

// Full Unit code.
// -----------------------------------------------------------
// You must store this code in a unit called Unit1 with a form
// called Form1 that has an OnCreate event called FormCreate.
 
unit Unit1;
 
interface
 
uses
  DateUtils,   // Unit containing the DaySpan command
  SysUtils,
  Forms, Dialogs;
 
type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  end;
 
var
  Form1: TForm1;
 
implementation
{$R *.dfm} // Include form definitions
 
procedure TForm1.FormCreate(Sender: TObject);
var
  fromdate, toDate : TDateTime;

begin
  // Set up our date variables
  fromDate := EncodeDateTime(2000, 01, 01, 0, 0, 0, 0);
  toDate   := EncodeDateTime(2000, 01, 02, 12, 0, 0, 0);

  // Display these dates and the days between them
  ShowMessage('From date = '+DateTimeToStr(fromDate));
  ShowMessage('To   date = '+DateTimeToStr(toDate));
  ShowMessage('Fractional days difference = '+
              FloatToStr(DaySpan(toDate, fromDate))+' days');
end;
 
end.