Select Variables to Merge into Single Date/Time Variable
Select the variables that represent the different parts
of the date/time.
Some combinations of selections are not allowed.
For instance, creating a date/time variable from Year and Day of Month
is invalid because once Year is chosen, a full date is required.
You cannot use an existing date/time variable as
one of the parts of the final date/time variable you’re creating.
Variables that make up the parts of the new date/time variable must
be integers. The exception is the allowed use of an existing date/time
variable as the Seconds part of the new variable. Since fractional
seconds are allowed, the variable used for Seconds is not required
to be an integer.
Values, for any part of the new variable, that are
not within the allowed range result in a value of system-missing for
the new variable. For instance, if you inadvertently use a variable
representing day of month for Month, any cases with day of month values
in the range 14–31 will be assigned the system-missing value
for the new variable since the valid range for months in IBM® SPSS® Statistics is 1–13.