Arcurve Summer 2021 Internship Coding Challenge

alirezamosavi_solution.cs

using System;
					
public class Program
{
	public static void Main()
	{
		Program testProgram = new Program();
		DateTime aDate = new DateTime(2010, 2, 14);
		DateTime utcMonthStart = new DateTime();
		DateTime utcNextMonthStart = new DateTime();
		testProgram.GetMonthRangeInUtc(aDate, out utcMonthStart, out utcNextMonthStart);
		Console.WriteLine("The first second of the first day of the month is: {0}", utcMonthStart);
		Console.WriteLine("The first second of the first day of the next month: {0}", utcNextMonthStart);
	}
	
	/// <summary>
	/// Given a local date, get UTC date/time values for the first second of the first day
	/// of the month containing that date and the first second of the first day of next month.
	/// </summary>
	/// <example>
	/// When run in Calgary, an input date of February 14, 2010 yields:
	/// The first second of the first day of the month is: 7:00:00am, February 1, 2010 (UTC)
	/// The first second of the first day of the next month: 7:00:00am, March 1, 2010 (UTC)
	/// </example>
	/// <param name="aDate">An arbitrary date, in localtime
	/// <param name="utcMonthStart">Output: First day of the month in which aDate occurs, in UTC
	/// <param name="utcNextMonthStart">Output: First day of the month after aDate, in UTC

	void GetMonthRangeInUtc(DateTime aDate, out DateTime utcMonthStart, out DateTime utcNextMonthStart)
	{
        // errors are annotated in the below comments and numbered by error i (1...4)
		// compute the first day of the month containing aDate and successive months
		//DateTime[] monthStart = new DateTime[2];
		// error 2: Run-time exception: Index outside the bounds of the array.
		// solution: don't use a loop (why would you need to?)
		//for (int i = 0; i <= monthStart.Length; i++)
		//{
			// error 1: aDate.Month causes compilation error since it is read only
		    //  solution: use a temp variable in the loop
		//	int month = aDate.Month;
		//	monthStart[i] = new DateTime(aDate.Year, month++, 1);
		//}

		// Compute the offset from UTC to our local time (UTC + offset = localtime).
		// error 3: utcOffset is not adjusted to 7 hour offset for Calgary
		//TimeSpan utcOffset = TimeZone.CurrentTimeZone.GetUtcOffset(aDate);

		// convert local times to UTC (UTC = localtime - offset)
		// error 4: does not handle end of month case, ex. Feb 28 11:59PM
		//utcMonthStart = monthStart[0].Subtract(utcOffset);
		//utcNextMonthStart = monthStart[1].Subtract(utcOffset);
		
		// get the beginning of the month
		DateTime monthStart = new DateTime(aDate.Year, aDate.Month, 1);
		// get the local offset 
		TimeSpan localOffset = new TimeSpan(0,7,0,0);
		// beginning of given month and converting to UTC
		utcMonthStart = monthStart.Add(localOffset);
		// beginning of next given month by adding 1 month 
		utcNextMonthStart = monthStart.AddMonths(1).Add(localOffset);
	}
}