Progress
Startup Command and Parameter
Reference
Century Year Offset (-yy)
n
A four-digit year (1990, for example). The default is 1950.
Use Century Year Offset (
-yy
) to determine the start of the 100-year period in which a date with a two-digit year is valid.Some Progress applications reserve only two-digits for the year in the date format. When, for example,
-yy
is set at 1950, Progress determines if the two-digit year value is greater or less than 50. If the year is greater than 50, Progress assumes that the date is in the twentieth century. If the year is less than 50, Progress assumes that the date is in the twenty-first century.Table 4–4 shows examples.
Notice that all two-digit year values expand into the 100-year period beginning with -yy.
To test the effect of
-yy
, start Progress with a different-yy
value and run the following procedure:
NOTE: If you use a hard-coded date containing a two-digit year in a.p
file, Progress honors the-yy
parameter and expands the two-digit year to a four-digit year during compilation. However, this may not match the runtime-yy
. For this reason, Progress Software recommends that you use four digit years for hard-coded dates in programs. For example:
NOTE: When you dump or load any database, the-yy
setting you load with must match the-yy
setting that was used for dumping, unless you use the Four Digit Year Default (-yr4def) startup parameter for dumping.
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