using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        // Quarter Start and End Date

        int year = 2026;

        DateTime date = new DateTime(year, 1, 1);;

        int quarterNumber = 2; //(date.Month-1)/3+1;

        DateTime firstDayOfQuarter = new DateTime(date.Year, (quarterNumber-1)*3+1,1);

        DateTime lastDayOfQuarter = firstDayOfQuarter.AddMonths(3).AddDays(-1);

        Console.WriteLine($"firstDayOfQuarter: {firstDayOfQuarter}");

        Console.WriteLine($"lastDayOfQuarter: {lastDayOfQuarter}");

        DateTime goLiveDate = DateTime.ParseExact("31/01/2025 12:00:00 AM", "dd/MM/yyyy hh:mm:ss tt", CultureInfo.InvariantCulture);

        Console.WriteLine($"goLiveDate: {goLiveDate}");

        string goLiveDateStr = goLiveDate.ToString("dd/MM/yyyy hh:mm:ss tt");

        Console.WriteLine($"goLiveDateStr: {goLiveDateStr}");

        // Convert hours minutes part from DateTime into int seconds

        string shipByDateTimeStr = "2024-11-20 13:30:00";

        DateTime shipByDateTime;

        bool shipCheck = DateTime.TryParseExact(shipByDateTimeStr, "yyyy-MM-dd HH:mm:ss", CultureInfo.InvariantCulture, DateTimeStyles.None, out shipByDateTime);

        Console.WriteLine($"shipCheck: {shipCheck}");

        Console.WriteLine($"shipByDateTime: {shipByDateTime}");

        DateTime shipByDate = shipByDateTime.Date;

        Console.WriteLine($"shipByDate: {shipByDate}");

        TimeSpan shipTimeSpan = shipByDateTime.Subtract(shipByDate);

        double shipTime = shipTimeSpan.TotalSeconds;

        Console.WriteLine($"shipTime: {shipTime}");

        // Convert int time into DateTime

        string modifiedDateStr = "2024-11-09";

        DateTime modifiedDate;

        bool isSuccessC1 = DateTime.TryParseExact(modifiedDateStr, "yyyy-MM-dd", CultureInfo.InvariantCulture, DateTimeStyles.None, out modifiedDate);

        Console.WriteLine($"isSuccessC1: {isSuccessC1}");

        Console.WriteLine($"modifiedDate: {modifiedDate}");

        int modifiedTimeInt = 6025;

        TimeSpan modifiedTimeSpan = TimeSpan.FromSeconds(modifiedTimeInt);

        modifiedDate = modifiedDate.Add(modifiedTimeSpan);

        Console.WriteLine($"modifiedDateTime: {modifiedDate}");

        // Minutes different from two date time

        DateTime startTime;

        bool tryParseExact = DateTime.TryParseExact("2025-02-02 19:35:00", "yyyy-MM-dd HH:mm:ss", CultureInfo.InvariantCulture, DateTimeStyles.None, out startTime);;

        DateTime endTime = DateTime.Now;

        TimeSpan span = endTime.Subtract(startTime );

        double differenceMinutes = span.TotalMinutes;

        Console. WriteLine( $"startTime: {startTime} endTime: {endTime} Difference (minutes): {differenceMinutes}" );

        double differenceDays = span.TotalDays;

        Console. WriteLine( $"startTime: {startTime} endTime: {endTime} Difference (days): {differenceDays}" );

        // String to DateTime

        string settlementTimeStr = "2024-11-09 19:04:13";

        DateTime settlementTime;

        bool isSuccess1 = DateTime.TryParseExact(settlementTimeStr, "yyyy-MM-dd HH:mm:ss", CultureInfo.InvariantCulture, DateTimeStyles.None, out settlementTime);

        Console.WriteLine($"isSuccess1: {isSuccess1}");

        Console.WriteLine($"settlementTime: {settlementTime}");

        // Validate TimeSpan

        string input = "23:59:59";

        TimeSpan timeSpan;

        bool valid = TimeSpan.TryParseExact(input, "hh\\:mm\\:ss", CultureInfo.InvariantCulture, out timeSpan);

        Console.WriteLine($"Valid: {valid}");

        // Compare TimeSpan

        string t1Str = "18:00:00";

        TimeSpan.TryParseExact(t1Str, "hh\\:mm\\:ss", CultureInfo.InvariantCulture, out TimeSpan t1);

        Console.WriteLine($"From: {t1}");

        string t2Str = "05:00:00";

        TimeSpan.TryParseExact(t2Str, "hh\\:mm\\:ss", CultureInfo.InvariantCulture, out TimeSpan t2);

        Console.WriteLine($"To: {t2}");

        CultureInfo culture = new CultureInfo("en-US");

        DateTime timestamp = Convert.ToDateTime("6/13/2024 3:30:00", culture);

        Console.WriteLine($"Timestamp: {timestamp}");

        DateTime today = DateTime.Today;

        DateTime tomorrow = DateTime.Today.AddDays(1);

        DateTime fromDateTime = today + t1;

        DateTime toDateTime = today + t2;

        if (toDateTime < fromDateTime)

            toDateTime = tomorrow + t2;

        Console.WriteLine($"fromDateTime: {fromDateTime}");

        Console.WriteLine($"toDateTime: {toDateTime}");

        if (!((timestamp >= fromDateTime) && (timestamp <= toDateTime)))

            Console.WriteLine($"{timestamp} tidak masuk range dari {fromDateTime} ke {toDateTime}");

        TimeSpan ts4 = TimeSpan.FromMilliseconds(6000);;

        Console.WriteLine($"ts4: {ts4}");

        Console.WriteLine(timestamp.ToString("ddd"));

    }

}