#### 8.4.2.6 IfcMonthInYearNumber

IfcMonthInYearNumber is an integer that defines the position of the specified month in a year.

Calendar month numbers map to calendar month names as follows:

- 1: January
- 2: February
- 3: March
- 4: April
- 5: May
- 6: June
- 7: July
- 8: August
- 9: September
- 10: October
- 11: November
- 12: December

Type: INTEGER

> NOTE See definition of calendar month as defined in ISO 8601.

> HISTORY New type in IFC1.5.1.

XSD Specification:

<xs:simpleType name="IfcMonthInYearNumber">
<xs:restriction base="xs:long"/>
</xs:simpleType>
<xs:element name="IfcMonthInYearNumber-wrapper" nillable="true">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="ifc:IfcMonthInYearNumber">
<xs:attributeGroup ref="ifc:instanceAttributes"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>

EXPRESS Specification:

TYPE IfcMonthInYearNumber = INTEGER;
| WHERE
ValidRange | : | {1 <= SELF <= 12} |
END_TYPE;

EXPRESS-G diagram

Formal Propositions:

ValidRange | : | The valid range for positioning a month in a year is min inclusive = 1 and max inclusive = 12.

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