When a value is read with ANYDTDTMw. informat and the style of the value is dd/dd/dd(dd) tt:tt:tt AM|PM, the MDYAMPMw.d informat is called to read the value. If the AM|PM component is not present, the MDYAMPMw.d informat is used as long as the month and day components aren't ambiguous. If they are ambiguous, the value of the DATESTYLE= system option is used to determine the order of month, day, and year components.

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Full Code

These examples illustrate how the ANYDTDTMw. informat reads values based upon an AM|PM specification and the DATESTYLE= system option.

/* Since AM is specified with the value, the ANYDTDTM informat */
/* is called to read the datetime value.                       */

options datestyle=dmy;
data test1;
  format xtext $22. xdate DATETIME18.;
  xtext="07/01/2008 12:30:00 AM";
  xdate=input(xtext,ANYDTDTM30.);
proc print;
run;

/* Since AM|PM aren't specified and the month and day components */
/* are ambiguous, the DATESTYLE= system option is used to        */
/* determine their order.                                        */

options datestyle=dmy;
data test2;
  format xtext $22. xdate DATETIME18.;
  xtext="07/01/2008 12:30:00"; 
  xdate=input(xtext,ANYDTDTM30.);
proc print;
run;

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Output

/* Notice the differences in XDATE based on the order of month and day */

Obs    xtext                                  xdate

 1     07/01/2008 12:30:00 AM      01JUL08:00:30:00

                                                                                             1456

Obs    xtext                                  xdate

 1     07/01/2008 12:30:00         07JAN08:12:30:00