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IfcDaylightSavingHour

Definition from IAI: The positive integer value by which clock time is offset from solar time at the particular location.

Type: INTEGER

HISTORY This entity has changes after IFC Release 1.5.1.
This entity has changes after IFC Release 2.0.
ISSUE See issue and change log for issues and changes made in IFC Release 2x.

EXPRESS specification:

TYPE IfcDaylightSavingHour = INTEGER;
WHERE
WR1  :  { 0 <= SELF <= 2 };
END_TYPE;

Formal Propositions:

WR1  :  Daylight saving number is always positive and can take the maximum value of 2 (hours) ahead of local time.
Depending on the locality and the time of year, the value may be 0, 1 or 2.

References (1):

Name Type Referred through Express-G
IfcLocalTime Entity
Attribute 'DaylightSavingOffset'
Diagram 1