using System;

public class Program

{

    public static void Main()

    {

        var date = DateTime.Parse("3/16/2023");

        var dateTime1 = CalculateDateTimePumped(date, 0, 0);

        var dateTime2 = CalculateDateTimePumpedUtc(date, 0, 0);

        Console.WriteLine(string.Format("DateTime Pumped: {0}", dateTime1));

        Console.WriteLine(string.Format("DateTime Pumped (UTC): {0}", dateTime2));

    }

    public static DateTime CalculateDateTimePumped(DateTime date, int hours, int minutes)

    {

        var dateTimePumped = new DateTime(

            date.Year,

            date.Month,

            date.Day,

            hours, minutes, 0);

​

        return dateTimePumped;

    }

    public static DateTime CalculateDateTimePumpedUtc(DateTime date, int hours, int minutes)

    {

        TimeZoneInfo estTimeZone = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time");

        var utcOffset = estTimeZone.BaseUtcOffset;

​

        var dateTimePumped = new DateTimeOffset(

            date.Year,

            date.Month,

            date.Day,

            hours, minutes, 0, utcOffset);

​

        return dateTimePumped.UtcDateTime;

    }

}