Time Expressions

Expressions that evaluate to a time are similar to those which evaluate to a date.

A time expression must begin with one of the components described in the following list.

Time View-An attribute view on the primitive domain Time, like FLIGHT Time_of_Arrival
Time Function-An Action Diagram Function that evaluates to a time, for example:
```
TIMENUM(IMPORT APPOINTMENT NUMERIC_TIME)
```
Current Time-The special attribute which contains the current time

Time expressions can include a numeric modifier to adjust the time component by a number of hours, minutes or seconds.