Special Notes on Dates

You can enter values for various date for an operation. If you change a date for an operation, the system also modifies the dates for subsequent operations associated with the operation that you modify.

Note: You can also perform global updates on dates for quality operations using the Edit Quality Results form in the Speed Quality Results program (P31B98).

You can modify these dates:

• Instructed Start Date

  Enter the planned start date and time for the operation. The system provides the current date and time as the default value, but you can override it. If you do not enter a value here, but enter an instructed duration in the Elapsed Time field and an instructed end date, the system calculates the instructed start date by subtracting the value in the Elapsed Time field from the value in the Instructed End Date field.

• Instructed End Date

  Enter the planned end date and time for the operation. If you do not enter a value here, but enter an instructed duration in the Elapsed Time field and an instructed start date, the system calculates the instructed start date by adding the value in the Elapsed Time field to the value in the Instructed Start Date field.

• Elapsed Time

  Enter the elapsed time. If you do not enter a value here, the system calculates the time by taking the difference between the value in the Instructed Start Date field and the value in the Instructed End Date field.

• Actual Start Date

  Enter the actual start date and time for the operation or the system enters the date. The system calculates the date by subtracting the value in the Actual Elapsed Time field from the value in the Actual End Date field. This value is never blank because the system uses this value for sequencing operations with dependencies.

• Actual End Date

  Enter the actual end date and time for the operation or the system enters the date. The system calculates this by adding the value in the Actual Elapsed Time field to the value in the Actual Start Date field.

• Actual Elapsed Time

  Enter the duration or the system enters the duration. The system calculates the difference between the Actual Start Date and Actual End Date fields.

If you enter a value in both the start date and elapsed time fields for the instructed or actual dates, the system calculates the end date. If you then change the start date, the system does not change the end date. Instead, it recalculates the value for the elapsed time.