In .NET you could do use the AddMonths
method:
DateTime date = new DateTime(2013, 5, 19);
DateTime newDate = date.AddMonths(14);
As far as parsing a date from a string using a specified format you could use the TryParseExact
method:
string dateStr = "19/05/2013";
DateTime date;
if (DateTime.TryParseExact(dateStr, "dd/MM/yyyy", CultureInfo.InvariantCulture, DateTimeStyles.None, out date))
{
// successfully parsed the string into a DateTime instance =>
// here we could add the desired number of months to it and construct
// a new DateTime
DateTime newDate = date.AddMonths(14);
}
else
{
// parsing failed => the specified string was not in the correct format
// you could inform the user about that here
}
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solved Adding a number to the day or month or year in a date [duplicate]