Converting a String to DateTime

Question

How do you convert a string such as 2009-05-08 14:40:52,531 into a DateTime?

Answer 1

Do you want it fast?

Let's say you have a date with format yyMMdd.

The fastest way to convert it that I found is:

var d = new DateTime(
(s[0] - '0') * 10 + s[1] - '0' + 2000, 
(s[2] - '0') * 10 + s[3] - '0', 
(s[4] - '0') * 10 + s[5] - '0')

Just, choose the indexes according to your date format of choice. If you need speed probably you don't mind the 'non-generic' way of the function.

This method takes about 10% of the time required by:

var d = DateTime.ParseExact(s, "yyMMdd", System.Globalization.CultureInfo.InvariantCulture);