How to check a persian date between two persian dates?

void Main()
{
	string one = "1399/07";
	string two = "03/1400";
	string three = "01/1400";
	DateTime dOne = GetDate(one);
	DateTime dTwo = GetDate(two);
	DateTime dThree = GetDate(three);
	bool answer = dThree>=dOne && dThree<=dTwo;
	Console.WriteLine($"'{dThree.ToString("yyyy-MM-dd")}' is between '{dOne.ToString("yyyy-MM-dd")}' and '{dTwo.ToString("yyyy-MM-dd")}'? => {answer}");
	
}

// Define other methods and classes here
public static DateTime GetDate(string initialValue)
{
	int pos = initialValue.IndexOf("/");
	string dformat = pos ==2 ? "MM/yyyy" : "yyyy/MM";
	DateTime dDate = DateTime.MinValue;
	DateTime.TryParseExact(initialValue, dformat, CultureInfo.GetCultureInfo("fa-IR"), DateTimeStyles.None, out dDate);
	return dDate;
}