Problems:

• differing use of timestamps (Jun 15, 2015 11:54:38 AM vs 10/05/2010 2:04 PM)
• differing amount of information (sometimes administrator names are missing, often differences between created vs last modified)
• differing formats of information
  • created vs last modified vs published
  • summary vs created/last modified
• inconsistent or non-existent value provided by the information
  • "created" information serves very little purpose for Donation Campaigns, but "last modified" date of forms within would)
• Surprisingly, Survey contains the most relevant and digestible information in its Summary field where it provides both creation and modification information together.

Pagebuilder:
Last Modified @ top level view
Created AND Last Modified @ manage level view

Survey: <-- Ideal!
Contains Summary field that contains
Created and Modified (which reflects Last Modified)

Calendar Events:
No creation information
Includes event date

TeamRaiser (Both indivdual events and blueprint views)
No creation information
Under status "Published Date" and "Unpublished Date"
Includes event date

Donations2
Summary contains only Created @ campaign and form level views
Publish and Unpublish "Schedules" present at form level view

Advocacy
Last Modified for Action Alerts, Call Alerts, and LTEs

Emails
Last Modifed at Campaign and Message level views

Email Stationary
Date Modified only

eCards
Date modified only

Groups
Last modifed only, no admin name or system name associated

Image Library
Date Added, no admin name associated

Document Library
Date Uploaded, no admin name associated

PageWrapper
Last Modified @ top level
Created and Last Modifed @ manage level