using System;

using System.Globalization; 

​

public class Program

{

    public static void Main()

    {

    string s = "2024-07-03T00:03:51.0616966Z";

​

        var utcNow = DateTime.ParseExact(s, "yyyy-MM-dd'T'HH:mm:ss.fffffff'Z'", CultureInfo.InvariantCulture);

        var today = DateOnly.FromDateTime(utcNow);

        var currentUtcTime = TimeOnly.FromDateTime(utcNow);

        var timeZone = "America/Los_Angeles";

        var customerCollectionTimes = new CustomerCollectionTimes(TimeOnly.Parse("05:00"), TimeOnly.Parse("18:00"));

        var carrierCollectionTimes = new CarrierCollectionTimes(TimeOnly.Parse("23:59"), TimeOnly.Parse("16:00"));

        var localCurrentTime = GetLocalCurrentTime(timeZone, today.ToDateTime(currentUtcTime));

        var expectedSameDayBookingLocalTime = ExpectedSameDayBookingTime(

            customerCollectionTimes,

            carrierCollectionTimes

        );

        if (

            IsExpectedBookingTimeAfterTheConcurrencyBufferWindow(

                localCurrentTime,

                expectedSameDayBookingLocalTime

            )

        ){

            Console.WriteLine($"Shipment can not be scheduled in timezone {timeZone} for same day collection at local time {localCurrentTime} because it is after {expectedSameDayBookingLocalTime}");

        }

    }

    private static bool IsExpectedBookingTimeAfterTheConcurrencyBufferWindow(

        TimeOnly localCollectionTime,

        TimeOnly expectedSameDayBookingLocalTime

    )

    {

        return localCollectionTime >= expectedSameDayBookingLocalTime;

    }

    private static TimeOnly GetLocalCurrentTime(string timeZone, DateTime currentDateTime) =>

        TimeOnly.Parse(

            TimeZoneInfo

                .ConvertTimeBySystemTimeZoneId(currentDateTime, "Etc/UTC", timeZone)

                .TimeOfDay.ToString()

        );

    private static TimeOnly ExpectedSameDayBookingTime(

        CustomerCollectionTimes customerCollectionTimes,

        CarrierCollectionTimes carrierCollectionTimes

    ) =>

        MinTimeOnly(

            customerCollectionTimes.CloseTime,

            MinTimeOnly(

                carrierCollectionTimes.BookingCutOffTime,

                carrierCollectionTimes.CollectionCutOffTime

            )

        );

    public readonly record struct CustomerCollectionTimes(TimeOnly ReadyTime, TimeOnly CloseTime);

    public readonly record struct CarrierCollectionTimes(

    TimeOnly BookingCutOffTime,

    TimeOnly CollectionCutOffTime

);

​

    private static TimeOnly MinTimeOnly(

        TimeOnly firstTimeToCompare,

        TimeOnly secondTimeToCompare

    ) => firstTimeToCompare < secondTimeToCompare ? firstTimeToCompare : secondTimeToCompare;

}