A Major Event Day is defined, as per IEEE standard 1366-2003, as any day whose SAIDI figure (for the day) exceeds a certain threshold value Tmed, which is derived from the previous 5 years' worth of historical outage data (the exact procedure for that derivation is documented in IEEE standard 1366-2003). A Major Event Day is defined, as per IEEE standard 1366-2003, as any day whose SAIDI figure (for the day) exceeds a certain threshold value Tmed, which is derived from the previous 5 years' worth of historical outage data (the exact procedure for that derivation is documented in IEEE standard 1366-2003).

'Declaration
 
Public Function IsMajorEventDay( _
   ByVal outageTime As System.Date _
) As System.Boolean

'Usage
 
Dim instance As MajorEventDayManager
Dim outageTime As System.Date
Dim value As System.Boolean
 
value = instance.IsMajorEventDay(outageTime)

public System.bool IsMajorEventDay( 
   System.DateTime outageTime
)