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*   CE801.T15 DB-EZTest Tech Note                      October 1998 *

*                                                                   *

*   KEYWORDS: DB-EZTest BIZDAY                                      *

*                                                                   *

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*                                                                   *

*   This Tech Note describes how EZ-Test2000 aging takes place      *

*   when the parameter BIZDAY=YES is specified for a date field.    *

*                                                                   *

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*                                                                   *

*  Regular default aging (when BIZDAY=NO is specified or allowed    *

*  to default) works by calculating the number of days between      *

*  the rundate and basedate and then adding that number of days     *

*  to each date.  When BIZDAY=YES is specified, the number of       *

*  days to age by is worked out differently.  Unless this is        *

*  properly understood, apparently confusing results can be seen.   *

*                                                                   *

*  The underlying principle is that by specifying BIZDAY=YES        *

*  you are saying that you want the amount of aging to be by the    *

*  number of business days between the rundate and basedate. This   *

*  is not the same as aging normally and then subsequently          *

*  adjusting to ensure that the resultant date falls on a           *

*  business day.                                                    *

*                                                                   *

*  Business day aging is done this way to ensure that dates that    *

*  are a certain number of business days apart will keep that       *

*  relationship after aging.  The process also works both ways;     *

*  ie forward aging on a read and reverse aging for a modify will   *

*  produce consistant results.  This would not be the case if the   *

*  process was one of simple moving the date forward to the next    *

*  business day.                                                    *

*                                                                   *

*  An effect of this that should be appreciated is that a           *

*  BIZDAY=YES date wil not necessarily age to the same date as a    *

*  BIZDAY=NO date.                                                  *

*                                                                   *

*  One other point to consider is that the basedate and rundate     *

*  should both be business dates themselves.                        *

*                                                                   *

*                                                                   *

*  An example.                                                      *

*  Basedate is 7th April 1998                                       *

*  Rundate is 14th April 1998                                       *

*                                                                   *

*  Default aging is by 7 days.                                      *

*  Business days aging is by 3 working days as the 10th and 13th    *

*  are holidays and there is one weekend in between.                *

*                                                                   *

*  Date to be aged is 1st April 1998.                               *

*  With BIZDAY=NO, it is aged to 8th April 1998.                    *

*  With BIZDAY=YES, it is aged to 6th April 1998.                   *

*                                                                   *

*  In reality of course, aging will be by a much larger amount      *

*  but this example serves to illustrate the principle.             *

*                                                                   *

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