Can someone help me find the Error?

Question

I made a new Code coach Challenge (day of the week) and everything except for Challenge 1 and 5 are false. Why? (Challenge 1 works in PC)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Sololearn
{
class Program
{
static void Main(string[] args)
{
string day = Console.ReadLine();
if(day.Contains("/"))
{
string[] dates =day.Split('/');
day = dates[1] + "/" + dates[0] + "/" + dates[2];
}
var dayOfTheWerk = DateTime.Parse(day);
Console.WriteLine(dayOfTheWerk.DayOfWeek.ToString());
}
}
}

Answer 1

Already solved I needed to spin it because of where I come from but SoloLearn does Not need that also Just delete the entire if statment