string to millis

dothis.java

private static SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
int i = 0;
Transaction tx = db.beginTx();
try {
  for ( Node node : GlobalGraphOperations.at(db).getAllNodes()) {
    Date theDate = DATE_FORMAT.parse((String)node.getProperty("my_date_as_string_property", "2099-12-31 12:00:00"));
    node.setProperty("new_date_as_millis", theDate.getTime());
    i++;
    // Commit every x transactions
    if (i % 10000 == 0) {
        tx.success();
        tx.close();
        tx = db.beginTx();
    }
  }

    tx.success();
    } finally {
        tx.close();
}