using System;
using System.Globalization;
public class Test
{
public static void Main()
{
string s = "6/6/2014 12:24:30 PM";
DateTime dt;
if(DateTime.TryParseExact(s, "M/d/yyyy hh:mm:ss tt",
CultureInfo.InvariantCulture,
DateTimeStyles.None, out dt))
{
Console.WriteLine(dt.ToString("yyyy-MM-ddThh:mm:ss.fffz"));
}
}
}
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