handling format exception in code

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ASP.NET

C#3.5

When i pass wrong date format e.g. omitting minutes part then it throws error:

System.FormatException: String was not recognized as a valid DateTime.

how to handle it in code so clients gets decent message ?

public List<Coordinates> FetchCoordinates(String FetchParam) 
    {
        List<Coordinates> Coords = new List<Coordinates>();
        Coordinates c;
 
        if(String.IsNullOrEmpty(FetchParam))
        {
            c = new Coordinates()
                        {
                            Error = "No Input Provided"
                        };
                        Coords.Add(c);
                        return Coords;
        }

        String[] parts = FetchParam.Split(',');
        sqlCom.CommandText = "FetchCoordinates";
        sqlCom.CommandType = CommandType.StoredProcedure;

        String IMEI = parts[0].ToString();
        DateTime DateTimeFrom = Convert.ToDateTime(parts[1]);
        DateTime DateTimeTo = Convert.ToDateTime(parts[2]);

        sqlCom.Parameters.Add("@IMEI", SqlDbType.VarChar).Value = IMEI;
        sqlCom.Parameters.Add("@DateTimeFrom", SqlDbType.VarChar).Value = DateTimeFrom;
        sqlCom.Parameters.Add("@DateTimeTo", SqlDbType.VarChar).Value = DateTimeTo;
        SqlParameter sqlParam = new SqlParameter("@result", SqlDbType.Int);
        sqlCom.Parameters.Add(sqlParam);
        sqlCom.Parameters["@result"].Direction = ParameterDirection.Output;

        try
        {
            sqlCon.Open();
            using (SqlDataReader reader = sqlCom.ExecuteReader())
            {
                    if (reader.HasRows)
                    {
                        while (reader.Read())
                        {
                            c = new Coordinates()
                            {
                                Longitude = reader["Longitude"].ToString(),
                                Latitude = reader["Latitude"].ToString()
                            };
                            Coords.Add(c);

                        }
                        return Coords;
                    }
                    else
                    {
                        c = new Coordinates()
                        {
                            Error = "No Data Found for Given Input"
                        };
                        Coords.Add(c);
                        return Coords;
                    }
                
                }
           
          }

        catch (Exception)
        {

            c = new Coordinates() 
            { 
                Error = "Something Went Wrong" 
            };
            Coords.Add(c);
            return Coords;

        }

        finally
        {
            sqlCon.Close();
        }
    }

how ?