Convert Date to any format from any other format

Convert a one date format to any other date format.
Date format must not be a regular Date format like ‘MM/dd/yyyy’. it can be a any format like ‘yyyyMMdd’

Coding :

public string DateFormatter(string Date,string RevFormat,string ReqFormat)
{
DateTime MyDateConverted = DateTime.ParseExact(Date, RevFormat, System.Globalization.CultureInfo.InvariantCulture);
string ReqDate = MyDateConverted.ToString(@ReqFormat);
return ReqDate;
}