using System.Globalization;
public static void Main()
var jp = CultureInfo.GetCultureInfo("ja-JP");
CultureInfo.CurrentCulture = jp;
System.Threading.Thread.CurrentThread.CurrentCulture = jp;
string format = "yyyy-MM-dd HH-mm-ss";
DateTime now = DateTime.Now;
string str1 = now.ToString(format);
DateTime d = DateTime.ParseExact(str1, format, CultureInfo.InvariantCulture);