first, let’s not deal with A, B, and C. They are too abstract. Let’s deal with MM DD YYYY (month day year). Let’s also assign the following values: 1) the PDF was created on your computer on 4/23/2015 2) it was emailed to someone on 4/27/2015 3) it was SAVED from the email box to the desktop on 4/29/2017 Windows would display the following: Date Modified 4/23/2015 (assuming you didn’t edit the PDF once it arrived) Date Created 4/29/2015 The email transmission is not relevant. Now… cloud providers do not necessarily follow Windows date management protocols, so if the document was posted and downloaded from the cloud, anything can happen.