DateTime date1 = DateTime.ParseExact(project.Variables["D_d"].Value, "dd.MM.yyyy.H.mm", CultureInfo.InvariantCulture);// время сейчас
DateTime date2 = DateTime.ParseExact(project.Variables["D"].Value, "dd.MM.yyyy.H.mm", CultureInfo.InvariantCulture);
int result = Int32.Parse((date1 - date2).TotalMinutes.ToString());
return result;