CREATE FUNCTION dt.STRDATE(VARTYPE,STRING) RETURNS STRING LANGUAGE LUA;
CREATE FUNCTION dt.STRTIME(VARTYPE,STRING) RETURNS STRING LANGUAGE LUA;
CREATE FUNCTION dt.STRDATETIME(VARTYPE,STRING) RETURNS STRING LANGUAGE LUA;
CREATE FUNCTION dt.STRFTIME(STRING,VARTYPE,STRING) RETURNS STRING LANGUAGE LUA;