Special Year-End Handling of Periodic Calendars

Rules, jobs, or missions may be improperly scheduled if a periodic calendar contains one or more periods that start in one year and continue into the next year, if both the following circumstances apply:

• The default gap between occurrences of matching identifiers has been changed from 33 days to a longer period

  and

• The first occurrence of the matching identifier in one logical year falls within the default gap that began at the last occurrence of the matching identifier in a prior logical year

In such cases, the period in the prior logical year overlaps the period in the later logical year, causing a scheduled rule not to run in the later logical year as expected.

To avoid this problem, remove logical years from periodic calendars as soon as they are no longer needed.

Example

• The FISCAL01 logical year extends from April 1, 2001 through March 31, 2002.
• The FISCAL01 logical year contains a period identified as Period A that has been defined to begin on December 28, 2001 and to continue through January 15, 2002.
• The FISCAL02 logical year extends from April 1, 2002 through March 31, 2003.
• The FISCAL02 logical year also contains a period identified as Period A, defined to begin on April 20, 2002 and continue through May 3, 2002.
• Rule X is scheduled for the seventh day of Period A in each logical year, through the rule definition DAYS=D7PA.

In a case where the default gap is 33 days, Rule X runs in January 2002, and again in April 2002, as expected.

In a case where the default gap is changed from 33 to a longer period, for example, 120 days, the first day of Period A in the FISCAL02 logical year occurs less than 120 days after the last appearance of Period A in the FISCAL01 logical year. As a result, what appears to be the seventh day in Period A in April 2002 is not recognized as such, because the "old" Period A overlaps the "new" Period A. Consequently, Rule X does not run again when the user may have expected it to run.