SPSS® 12.0 Command Syntax Reference

62 Universals
Example
DATA LIST RECORDS=2
/TIME 1-8 (TIME) DTIME 10-19 (DTIME) DATE 21-29 (DATE)
ADATE 31-38 (ADATE)
/DATTIME1 1-18 (DATETIME) DATTIME2 20-37 (DATETIME).
BEGIN DATA
1:10:15 1 0:25:10 13-8-90 10/21/90
28-OCT-90 9:15:17 29/OCT/90 10:30:22
END DATA.
COMPUTE ADDTIME=TIME+DTIME.
COMPUTE DATEDIF1=ADATE-DATE.
COMPUTE DATEDIF2=DATTIME2-DATTIME1.
COMPUTE DATETIME=DATTIME2+DTIME.
LIST VARIABLES=ADDTIME DATEDIF1 DATEDIF2 DATETIME.
FORMATS ADDTIME DATEDIF2 (TIME15) DATEDIF1 (DTIME15)
DATETIME (DATETIME25).
LIST VARIABLES=ADDTIME DATEDIF1 DATEDIF2 DATETIME.
The results of these commands are shown in Figure 20.
Figure 20 Results of arithmetic operations with date and time variables
ADDTIME DATEDIF1 DATEDIF2 DATETIME
25:35:25 69 00:00:00 25:15:05 30-OCT-1990 10:55:32
Date and Time Functions
Date and time functions provide aggregation, conversion, and extraction routines for dates
and time intervals. Each function transforms an expression consisting of one or more
arguments. Arguments can be complex expressions, variable names, or constants. Date and
time expressions and variables are legitimate arguments.
All date functions that accept the argument of day—for example, DATE.DMY(d,m,y),
DATE.MDY(m,d,y), and DATE.YRDAY(y,d)—check the validity of the argument. The value for
day must be an integer between 1 and 31. If an invalid value is encountered, a warning is
displayed and the value is set to system-missing. However, if the day value is invalid for a
particular month—for example, 31 in September, April, June, and November or 29 through
31 for February in non-leap years—the resulting date is placed in the next month (for example,
if you enter 2 for MONTH, 31 for DAY, and 91 for YEAR, the result becomes 03/02/91).