Sort dates in .NET.

Main.cs

void Main()
{
	var dates = new[]
	{
		new DateTime(2000, 1, 1),
		new DateTime(2005, 1, 1),
		new DateTime(2010, 1, 1),
		new DateTime(2015, 1, 1)
	};
	
	Console.WriteLine("Oldest to newest");
	dates.OrderBy(x => x)
		.Select(x => x.ToString("yyyy-MM-dd"))
		.ToList()
		.ForEach(Console.WriteLine);
		
	Console.WriteLine();
		
	Console.WriteLine("Newest to oldest");
	dates.OrderByDescending(x => x)
		.Select(x => x.ToString("yyyy-MM-dd"))
		.ToList()
		.ForEach(Console.WriteLine);
}

result.txt

Oldest to newest (OrderBy)
2000-01-01
2005-01-01
2010-01-01
2015-01-01

Newest to oldest (OrderByDescending)
2015-01-01
2010-01-01
2005-01-01
2000-01-01