To create a calendar transformation, select "Add → Calendar Dimension" from the diagram context menu.

As shown in the image below:

The Calendar Transformation Wizard will open. Typically, only one calendar transformation is required in the data warehouse.

As shown in the image below:

Parameters

1. Schema: The schema of the calendar transformation.
2. Name: The name of the calendar transformation.
3. Date From: The start date for the calendar.
4. Date To: The end date for the calendar.
5. Date-to-ID Function: The macro name that transforms a DateTime value into the key value for the calendar dimension. This macro is typically used in fact transformations to map datetime fields to calendar dimension members.
6. Stars: The data mart stars where the calendar transformation will be included.