The DATE-TO-YYYYMMDD Function

The DATE-TO-YYYYMMDD function converts argument-1 from the form YYmmdd to the form YYYYmmdd. Argument-2, when added to the year at the time of execution, defines the ending year of a 100-year interval, or sliding window, into which the year of argument-1 falls. The type of this function is integer.

General Format

    FUNCTION DATE-TO-YYYYMMDD ( argument-1 [argument-2] )

Arguments

Argument-1 must be a positive integer less than 1,000,000.
Argument-2 must be an integer.
If argument-2 is omitted, the function is evaluated as though 50 were specified.
The sum of the year at the time of execution and the value of argument-2 must be less than 10,000 and greater than 1699.

Returned Values

The equivalent arithmetic expression is:
(FUNCTION YEAR-TO-YYYY (YY, argument-2) * 10000 + nnnn) where:

YY = FUNCTION INTEGER (argument-1/10000) nnnn = FUNCTION MOD (argument-1, 10000)

and where argument-1 of the INTEGER and MOD functions and argument-2 of the YEAR-TO-YYYY function are the same as argument-1 and argument-2 of the DATE-TO-YYYYMMDD function itself.

Notes

In the year 2002 the returned value for FUNCTION DATE-TO-YYYYMMDD (851003, 10) is 19851003. In the year 1994 the returned value for FUNCTION DATE-TO-YYYYMMDD (981002, (-10)) is 18981002.
This function supports a sliding window algorithm. See the notes for the YEAR-TO-YYYY function for a discussion of how to specify a fixed window.