UniBasic Commands Reference - Rocket Software

1-337 UniBasic Commands Reference
If you do not enter a year, UniData defaults to the current year. For example,
if you enter 12/1 and the year is 1996, UniData stores 10563 (12/1/96).
If you enter a number between 1 and 12 for month, UniData defaults to the
first day of the month in the current year. For example, if you enter just 12
during 1996, UniData stores 10563 (12/1/96).
Any two-digit year entered in the range 00–29 defaults to the twenty-first
century. For example, UniData interprets 12/31/29 as December 31, 2029.
Any two-digit year entered in the range 30–99 is considered to be 1930–
1999.
Converting More Than Once
Depending on the date range, if an application performs ICONV on an already
converted date, UniData could produce unexpected results. Dates that convert into
four- or five-digit internal formats and meet the following conditions fall into this
category:
The first two digits are 10, 11, or 12.
The second two digits are 01 through 31.
The fifth digit is any number from 0 through 9. Where there is no fifth digit,
UniData assigns the current year.
For example, assuming 5/28/95 is the input, the code segment shown on the left
results in the displays on the right:
INPUT VAR
VAR=ICONV(VAR,'D')
PRINT VAR 10010
PRINT OCONV(VAR,'D') 28 MAY 1995
VAR=ICONV(VAR,'D')
PRINT VAR 11963
PRINT OCONV(VAR,'D') 01 OCT 2000
The first ICONV returns a value of 10010. OCONV correctly returns the external
format. The date matches the initial entry. However, the second ICONV accepts the
internal format, 10010, as input; UniData translates this as October 1, 2000, and
ICONV returns an internal format of 11963. The final OCONV returns 01 OCT 2000.
Note: To prevent the preceding scenario, you can make all numeric input of fewer
than six characters invalid by turning UDT.OPTIONS 82 on. However, your
applications will no longer be able to process the abbreviated input dates.