TSref

I just tested this and the conditions "smaller or equal", "bigger or equal" and "unequal" are working, too.
These three operands work with all conditions concerning time.

The first "=" sign is always needed and is no operator. After that follow the operator and then the hour.

When using multiple operators in one condition - separated with a comma -, it only works without repeating that first "=" sign everytime, e.g.

[hour = 8, > 15]
page.20.subparts {
  KOPF = TEXT
  KOPF.value = Hour equals 8 OR it is bigger than 15.
}
[GLOBAL]

I have added some examples to make that clear.
I also added a note to the meaning of the comma separator.
Finally I put in an example for 8-16 o'clock, which should demonstrate what you cannot do with the comma.

In contrast a condition matching for 8 until 16 o'clock would be:
[hour = > 7] && [hour = < 16]

Applied in changeset r664.