dateFormat = new SimpleDateFormat("dd/MM/yyyy H:mm:ss");
fromDate = dateFormat.parse(fromDateField.getText() + " " + fromTimeField.getText()).getTime();
toDate = dateFormat.parse(toDateField.getText() + " " + toTimeField.getText()).getTime();
sessionStartTime = dataSetsDAO.retrieveSessionStartTime(sessionID);
sessionFinishTime = dataSetsDAO.retrieveSessionFinishTime(sessionID);
logger.debug("Creating session from " + fromDate + " to " + toDate);
if ( fromDate < sessionStartTime - 1000 ) {
errorDialog = new JOptionPane();
errorDialog.showMessageDialog(this, "The \'From\' date/time must be within the session interval", "Can't display graph", JOptionPane.ERROR_MESSAGE);