Amadeus as a suggestion I think it would be better to start working with the soe version date/time stamp string in the properties of the everquest2.exe and not the date it they push it to the patch server. Using the latter method of identifying the file can cause confusion. For example they patched an exe with the version string of the 16th on the 17th and now the most recent exe has a date stamp string of the 17th. You can see where the potential for problems are here...
Also the day that the file is patched can only be determined from when the player actually patches the file, they possibly may patch the exe the day after now thinking the file is date is a day later. Not to mention players from different time zones that are one day ahead or behind, im sure i could think of more reasons if i tried
Each exe i work with i just copy and paste the version string and use that as my folder name for that everquest2.exe archive.