DateTime as initializer in for-loop

suggest change
// This iterates through a range between two DateTimes 
// with the given iterator (any of the Add methods) 

DateTime start = new DateTime(2016, 01, 01);
DateTime until = new DateTime(2016, 02, 01);

// NOTICE: As the add methods return a new DateTime you have
// to overwrite dt in the iterator like dt = dt.Add()
for (DateTime dt = start; dt < until; dt = dt.AddDays(1))
{
    Console.WriteLine("Added {0} days. Resulting DateTime: {1}", 
                      (dt - start).Days, dt.ToString());
}

Iterating on a TimeSpan works the same way.

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