IF-THEN-ELSE based on time of day

Testing time of day to determine whether to execute program or not. Testing hour of day.

IF-THEN-ELSE can test job step return code only. So, to check hour you need a trivial program. Here is an example of such program written in REXX:
/* REXX */
parse value time() with hour '.' .
exit hour
then you can use it in JCL:
//GETHOUR EXEC PGM=IRXJCL,PARM='GETHOUR'
//SYSTSPRT DD DUMMY
//SYSEXEC DD DSN=<library>,DISP=SHR where <library> is PDS or PDSE data set where member GETHOUR is a REXX code shown above
// IF (GETHOUR.RC = 12) THEN
// EXEC ...
// ENDIF

Mistype, sorry. REXX code (member GETHOUR) should be:
/* REXX */
parse value time() with hour ':' .
exit hour

semicolon rather than point