Scripting Guide - SAS

114 Types of Data Chapter 6
Date-Time Functions and Formats
Figure 6.2 Example of Calculating Date-Time Values
Time Intervals
The In Minutes, In Hours, In Days, In Weeks, and In Years functions are used to express time
intervals in units rather than seconds. Each of these functions returns the number of seconds associated with
a particular period of time. For example, the following expression returns the number of weeks between now
and July 4, 2012.
(Date DMY(04,07,2012)-Today())/InWeeks();
55.6559441137566
When the argument for the interval function is empty, JMP counts by 1. You can enter another number to
change the count. For example, In Years(10) converts the interval to decades. The following expression
returns the number of decades between now and December 31, 2037.
(Date DMY(31,12,2037)-Today())/InYears(10);
2.65581440286967
Two- and Four-Digit Years
JMP applies its own algorithms for interpreting and displaying datetime strings rather than supporting
operating system-specific datetime formats. However, JMP uses the datetime separators selected in the
Region and Language control panel (Windows 7) or the Date & Time preferences (Macintosh) to interpret
and display dates.
Two-digit years are interpreted according to the current system clock year and JMP rules. For example,
when the year in a script is 11, and you run the script after 1990, the year shows as 2011.
Long Date(25May11);
"Wednesday, May 25, 2011"
To avoid ambiguity, enter four-digit years. The following expression returns 1911 (rather than 2011) as
indicated:
Long Date(25May1911);
"Thursday, May 25, 1911"
Table 6.3 explains how JMP interprets two-digit years.