am，pm时间转换

    class Program
    {
        static void Main(string[] args)
        {
            // Summary:
            //     Initializes a new instance of the System.Globalization.CultureInfo class
            //     based on the culture specified by name and on the Boolean that specifies
            //     whether to use the user-selected culture settings from the system.
            //
            // Parameters:
            //   name:
            //     A predefined System.Globalization.CultureInfo name, System.Globalization.CultureInfo.Name
            //     of an existing System.Globalization.CultureInfo, or Windows-only culture
            //     name. name is not case-sensitive.
            //
            //   useUserOverride:
            //     A Boolean that denotes whether to use the user-selected culture settings
            //     (true) or the default culture settings (false).
            System.Globalization.DateTimeFormatInfo dtInfo = new System.Globalization.CultureInfo("en-Us",true).DateTimeFormat;
            //Gets or sets the custom format string for a short time value.
            dtInfo.ShortTimePattern = "t";
            DateTime dt = DateTime.Parse("05-28-15 03:07PM ", dtInfo);
            Console.WriteLine(dt);
            Console.Read();
        }

            string strDt = "2014-03-02 03:07PM";
            strDt = strDt.Trim("PM".ToCharArray());
            DateTime dt =Convert.ToDateTime(strDt).AddHours(12);
            Console.WriteLine(dt);