iSeries - Library Change Date

Could someone tell me what the "Change Date/Time" signifies for a Library Object on the iSeries?  For example: I have a library named Library1. If I look at the attributes for that library object, it shows that the last change date/time was Today...even though I know that the object itself hasn't changed.

Does this attribute reflect that an object within the library has changed...or is it telling me that the actual library object has changed somehow...even though I know that no changes were made to it?

I just wanted to better understand what this might mean...

I appreciate any guidance...
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Matthew RoessnerSenior Systems ProgrammerAsked:
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Gary PattersonConnect With a Mentor VP Technology / Senior Consultant Commented:
Lots of actions cause the Change Date/Time to be updated on a library object.  This IBM Knowledgebase article has a section that specifically addresses *LIB objects:

http://www-01.ibm.com/support/docview.wss?uid=nas8N1014753

Note that you can't really rely on the Change Date / Time field for every object, for example database files.  The object-level Change Date/Time is primarily used to determine if an object has changed since the last backup.  If you really need to know when an object was changed, and who did it, use auditing:

http://www.ibm.com/support/knowledgecenter/ssw_ibm_i_61/rzarl/rzarlrelationtoaud.htm

- Gary
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Dave FordConnect With a Mentor Software Developer / Database AdministratorCommented:
Greetings, Matthew!

The "Change date/time" on a library object does not solely refer to the library object itself, but also to the contents of the library.

For example, when I came in this morning, the change date/time on my work-library was 2016-08-21. Then, is used SQL to create a table in that library. After creating the table, the change date/time on the library is 2016-08-25.

HTH,
DaveSlash
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