A time function is a
function that is applied to time or timestamp values or supplies a time or timestamp value as a result.Syntax
<time_function> ::=
ADDTIME ( <time_or_timestamp_expression>, <time_expression> )
| SUBTIME ( <time_or_timestamp_expression>, <time_expression> )
| TIMEDIFF ( <time_or_timestamp_expression>, <time_or_timestamp_expression> )
| MAKETIME ( <hours>, <minutes>, <seconds> )
A variety of
date and time formats (ISO, USA, EUR, JIS, INTERNAL) are available for processing date and time values.