Joined: 03 Oct 2009 Posts: 1786 Location: Bloomington, IL
Master of the Universe! That compiler has been out of service for a decade
OS PL/I did not have the DAYS built-in function (or many others). To the left, I'd urge you to urge your sysprogs to upgrade to an at least in-service compiler; to the right, jumping from OS PL/I 2.3 to Enterprise PL/I (4.4 is, I believe, the current version) may well be a non-trivial task.