HiRDB hasn't equivalents for SYS_EXTRACT_UTC function. SQLWays leaves it as is and adds message /* SQLWays: Could not convert 'SYS_EXTRACT_UTC' */.

Oracle:

select sys_extract_utc(a) from t;

HiRDB:

select sys_extract_utc(a) from t;
/* SQLWays: Could not convert 'sys_extract_utc' */