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

Oracle:

select from_tz(col1, col2) from t; 

HiRDB:

select from_tz(col1, col2) from t;
/* SQLWays: Could not convert 'from_tz' */