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The New Day procedure is date‑dependent. The last running date of the New Day procedure is stored in a special Date Control record. The Date Control record is referenced by the DACHK DD statement in the CTBNDAY procedure.
The New Day procedure calls the CTBCHK program to check the Date Control record. The Date Control record is analyzed by the New Day procedure to determine the current running date, the last running date, and possible error situations. Special situations, such as downtime due to hardware failure, must be handled. If necessary, the Date Control record can be manually updated by using a regular editor, for example the ISPF editor.
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