using System;

using TimeZoneConverter;

public class Program

{

    public static void Main()

    {

        // The time we try and tender before DST

        DateTime preDstTenderAtUtcTimeStamp = DateTime.Parse("3/13/2021 14:00:00");

        // The time we try and tender after DST

        DateTime postDstTenderAtUtcTimeStamp = DateTime.Parse("3/15/2021 14:00:00");

        // 8AM Local Time - Both Boise and Phoenix always open at 8AM irrespective of DST (Business Hours 8am - 2am)

        TimeSpan openAt = TimeSpan.FromMilliseconds(28800000);

        // 2AM Local Time (the next day) - Both Boise and Phoenix always close at 2AM irrespective of DST (Business Hours 8am - 2am)

        TimeSpan closeAt = TimeSpan.FromMilliseconds(93600000);

        // The both use different tz database names.

        TimeZoneInfo boiseTzInfo = TZConvert.GetTimeZoneInfo("America/Boise");

        TimeZoneInfo phoenizTzInfo = TZConvert.GetTimeZoneInfo("America/Phoenix");

        Console.WriteLine("Pre Daylight Savings Time");

        Console.WriteLine();

        Console.WriteLine();

        Console.WriteLine("Boise");

        Console.WriteLine();

        DateTime boiseOpenTime = TimeZoneInfo.ConvertTimeFromUtc(preDstTenderAtUtcTimeStamp, boiseTzInfo).Date;

        DateTime boiseCloseTime = TimeZoneInfo.ConvertTimeFromUtc(preDstTenderAtUtcTimeStamp, boiseTzInfo).Date;

        boiseOpenTime = boiseOpenTime.Date.Add(openAt);

        boiseCloseTime = boiseCloseTime.Date.Add(closeAt);

        DateTime boiseTenderTime = TimeZoneInfo.ConvertTimeFromUtc(preDstTenderAtUtcTimeStamp, boiseTzInfo);

        Console.WriteLine("Boise opens at: {0}", boiseOpenTime);

        Console.WriteLine("Boise closes at: {0}", boiseCloseTime);

        Console.WriteLine("Boise tenders at: {0}", boiseTenderTime);

        if(boiseTenderTime >= boiseOpenTime && boiseTenderTime <= boiseCloseTime)

            Console.WriteLine("Within Boise business hours");

        else

            Console.WriteLine("Outside of Boise business hours");

        Console.WriteLine();

        Console.WriteLine("Phoenix");

        Console.WriteLine();

        DateTime phoenixOpenTime = TimeZoneInfo.ConvertTimeFromUtc(preDstTenderAtUtcTimeStamp, phoenizTzInfo).Date;

        DateTime phoenixCloseTime = TimeZoneInfo.ConvertTimeFromUtc(preDstTenderAtUtcTimeStamp, phoenizTzInfo).Date;

        phoenixOpenTime = phoenixOpenTime.Date.Add(openAt);

        phoenixCloseTime = phoenixCloseTime.Date.Add(closeAt);

        DateTime phoenixTenderTime = TimeZoneInfo.ConvertTimeFromUtc(preDstTenderAtUtcTimeStamp, phoenizTzInfo);

        Console.WriteLine("Phoenix opens at: {0}", phoenixOpenTime);

        Console.WriteLine("Phoenix closes at: {0}", phoenixCloseTime);

        Console.WriteLine("Phoenix tenders at: {0}", phoenixTenderTime);

        if(phoenixTenderTime >= phoenixOpenTime && phoenixTenderTime <= phoenixCloseTime)

            Console.WriteLine("Within Phoenix business hours");

        else

            Console.WriteLine("Outside of Phoenix business hours");

        Console.WriteLine();

        Console.WriteLine();

        Console.WriteLine("Post Daylight Savings Time");

        Console.WriteLine();

        Console.WriteLine();

        Console.WriteLine("Boise");

        Console.WriteLine();

        boiseOpenTime = TimeZoneInfo.ConvertTimeFromUtc(postDstTenderAtUtcTimeStamp, boiseTzInfo).Date;

        boiseCloseTime = TimeZoneInfo.ConvertTimeFromUtc(postDstTenderAtUtcTimeStamp, boiseTzInfo).Date;

        boiseOpenTime = boiseOpenTime.Date.Add(openAt);

        boiseCloseTime = boiseCloseTime.Date.Add(closeAt);

        boiseTenderTime = TimeZoneInfo.ConvertTimeFromUtc(postDstTenderAtUtcTimeStamp, boiseTzInfo);

        Console.WriteLine("Boise opens at: {0}", boiseOpenTime);

        Console.WriteLine("Boise closes at: {0}", boiseCloseTime);

        Console.WriteLine("Boise tenders at: {0}", boiseTenderTime);

        if(boiseTenderTime >= boiseOpenTime && boiseTenderTime <= boiseCloseTime)

            Console.WriteLine("Within Boise business hours");

        else

            Console.WriteLine("Outside of Boise business hours");

        Console.WriteLine();

        Console.WriteLine();

        Console.WriteLine("Phoenix");

        Console.WriteLine();

        phoenixOpenTime = TimeZoneInfo.ConvertTimeFromUtc(postDstTenderAtUtcTimeStamp, phoenizTzInfo).Date;

        phoenixCloseTime = TimeZoneInfo.ConvertTimeFromUtc(postDstTenderAtUtcTimeStamp, phoenizTzInfo).Date;

        phoenixOpenTime = phoenixOpenTime.Date.Add(openAt);

        phoenixCloseTime = phoenixCloseTime.Date.Add(closeAt);

        phoenixTenderTime = TimeZoneInfo.ConvertTimeFromUtc(postDstTenderAtUtcTimeStamp, phoenizTzInfo);

        Console.WriteLine("Phoenix opens at: {0}", phoenixOpenTime);

        Console.WriteLine("Phoenix closes at: {0}", phoenixCloseTime);

        Console.WriteLine("Phoenix tenders at: {0}", phoenixTenderTime);

        if(phoenixTenderTime >= phoenixOpenTime && phoenixTenderTime <= phoenixCloseTime)

            Console.WriteLine("Within Phoenix business hours");

        else

            Console.WriteLine("Outside of Phoenix business hours");

    }

}