using System;

//using System.Globalization;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        string dateString = "2/17/2025 11:00:00 PM";

        //int weekNumber = GetWeekOfYear(dateString);

        //Console.WriteLine($"Týden: {weekNumber}");

        Console.WriteLine(GetFormattedDate(dateString));

    }

    static int GetWeekOfYear(string date)

    {

        DateTime parsedDate = DateTime.ParseExact(date, "M/d/yyyy", System.Globalization.CultureInfo.InvariantCulture);

        System.Globalization.CultureInfo culture = System.Globalization.CultureInfo.CurrentCulture;

        System.Globalization.Calendar calendar = culture.Calendar;

        return calendar.GetWeekOfYear(parsedDate, culture.DateTimeFormat.CalendarWeekRule, culture.DateTimeFormat.FirstDayOfWeek);

    }

    static string GetWeekOfYearString(string date)

    {

        DateTime parsedDate = DateTime.ParseExact(date, "M/d/yyyy",  System.Globalization.CultureInfo.InvariantCulture);

        System.Globalization.CultureInfo culture =  System.Globalization.CultureInfo.CurrentCulture;

        System.Globalization.Calendar calendar = culture.Calendar;

        int weekNumber = calendar.GetWeekOfYear(parsedDate, culture.DateTimeFormat.CalendarWeekRule, culture.DateTimeFormat.FirstDayOfWeek);

        return $"{weekNumber:D2}-{parsedDate.Year % 100:D2}";

    }

    static string GetWeekOfYearString2(string date)

    {

        string[] dateSplitField = date.ToString().Split(' ');

        DateTime parsedDate = DateTime.ParseExact(dateSplitField[0], "M/d/yyyy",  System.Globalization.CultureInfo.InvariantCulture);

        System.Globalization.CultureInfo culture = System.Globalization.CultureInfo.CurrentCulture;

        System.Globalization.Calendar calendar = culture.Calendar;

        int weekNumber = calendar.GetWeekOfYear(parsedDate, culture.DateTimeFormat.CalendarWeekRule, culture.DateTimeFormat.FirstDayOfWeek);

        return $"{weekNumber:D2}-{parsedDate.Year % 100:D2}";

    }

    static string GetFormattedDate(string date)

    {

        string[] dateSplitField = date.ToString().Split(' ');

        DateTime parsedDate = DateTime.ParseExact(dateSplitField[0], "M/d/yyyy",  System.Globalization.CultureInfo.InvariantCulture);

        return $"{parsedDate.Year:D4}/{parsedDate.Month:D2}/{parsedDate.Day:D2}";

    }

}