6.1.6.3.1 "COBOL Language Reference" IBM Library Server

X 6.1.6.3.1 Condition-Name Conditions and Windowed Date Field Comparisons

X If the conditional variable is a windowed date field, then the values
X associated with its condition-names are treated like values of the
X windowed date field; that is, they are treated as if they were converted
X to expanded date format, as described under "Semantics of Windowed Date
X Fields" in topic 5.3.6.1.

X For example, given YEARWINDOW(1945), specifying a century window of
X 1945-2044, and the following definition:

X 05 DATE-FIELD PIC 9(6) DATE FORMAT YYXXXX. X 88 DATE-TARGET VALUE 051220.

X then a value of 051220 in DATE-FIELD would cause the following condition
X to be true:

X IF DATE-TARGET...

X because the value associated with DATE-TARGET and the value of DATE-FIELD
X would both be treated as if they were prefixed by "20" before comparison.

X However, the following condition would be false:


 X   IF DATE-FIELD = 051220...

X because, in a comparison with a windowed date field, literals are treated
X as if they are prefixed by "19", regardless of the century window. So the
X above condition effectively becomes:


 X   IF 20051220 = 19051220...

X For more information on using windowed date fields in conditional
X expressions, see "Date Fields" in topic 6.1.6.4.1.

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X 6.1.6.3.1 Condition-Name Conditions and Windowed Date Field Comparisons

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