CICSPlex® SM uses three attributes to facilitate timing services. These attributes and their available values are:
These attributes are used to help CICSPlex SM:
These attributes are specified for the following CICSPlex SM definitions:
The three attributes that facilitate timing services are defined as follows:
The area having Greenwich Mean Time is referred to as time zone Z. The next time zone to the east, where time is 60 minutes (one hour) ahead of GMT, is time zone B. When GMT is 12:00 noon, the time in time-zone B is 13:00. The next time zone to the east, 120 minutes (two hours) ahead of GMT, is time zone C. For each time zone to the east, time advances one hour, until time zone M, where local time is 12 hours ahead of GMT. Time zone M is at the international date line.
The next time zone east, time zone N, is (like time zone M) separated from GMT by 12 hours. However, because it is considered to be on the opposite side of the international date line from time zone M, it is 12 hours behind GMT. Similarly, the next time zone east, time zone O, is 11 hours behind GMT. When GMT is 12:00 noon, the time in time zone O is 01:00. For each time zone to the east, one hour is subtracted, until time zone Y, which is one hour behind GMT.
Note that there is no time zone A.
For operation of CICSPlex SM, sites in locations that make use of LDST must modify the appropriate CICSPlex SM definition twice a year. This means indicating YES to daylight savings when LDST is in effect, and NO when LST is in effect. When the daylight savings indicator is NO, CICSPlex SM considers an entity in that time zone to be the normal number of hours from GMT. When the daylight savings indicator is YES, CICSPlex SM considers that entity to be one hour further ahead of GMT (than during standard time) for time zones Z through M, and one hour closer to GMT for time zones N through Y.
You make use of the three attributes that facilitate timing services when you specify the following definitions:
There are three uses for these attributes in a CMAS:
There is one use for the time zone attributes in a CICSplex:
There are three uses for these attributes in a CICS system:
There are three uses of period definitions:
For a period definition, there are two differences from other uses of the time zone attributes:
When a period definition is for time zone A, all events controlled by that period definition become active at the same clock time, based upon the start time specified in the period definition, and the time zone, time zone adjustment, and daylight saving indicator within the entity (CMAS or CICS system). Similarly, events become inactive at the same clock time, based upon the end time specified in the period definition, and the time zone, time zone adjustment, and daylight saving indicator within the entity (CMAS or CICS system).
When a period definition is for a time zone other than time zone A, all events controlled by that period definition become active at exactly the same real time, regardless of the time zone in which the events are occurring. The activation time is based upon the period definition’s start time, time zone, and time zone adjustment. Similarly, events controlled by that period definition become inactive at the same real time, based upon the period definition’s ending time, time zone, and time zone adjustment. For both activation and deactivation, the time zone specified refers to the standard time for that time zone (LST), regardless of whether daylight saving time is in effect.