public void currentTimeMillis(HplsqlParser.Expr_func_paramsContext ctx) {
    evalVar(new Var(System.currentTimeMillis()));
  }
UNIX_TIMESTAMP() function (current date and time in seconds since 1970-01-01 00:00:00)
hplsql/src/main/java/org/apache/hive/hplsql/functions/FunctionDatetime.java