The CALENDAR Procedure

START Statement

Specifies the variable in the activities data set that contains the starting date of each activity.

Alias:	STA, DATE, ID
Required:	START is required for both summary and schedule calendars.
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START variable;

variable

contains the starting date of each activity.

Restriction:	This variable must be in the activities data set.
Restriction:	Values of variable must be in either SAS date or datetime values.
Restriction:	If you use datetime values, then specify the DATETIME option in the PROC CALENDAR statement.
Restriction:	Both the START and FIN variables must have matching formats. For example, if one contains datetime values, then so must the other.