Hi,
Thanks for reverting with additional info. On changing system date, we should be seeing "" error on Dw launch since the system date is not matching with the internet time(i.e., current time). You can please refer to the below KB article regarding the system time.
KB article: https://helpx.adobe.com/in/download-install/kb/cannot-verify-subscription-offline-mode.html
Also, we are unable to recreate the issue internally on OSX 10.15.7 machine. As you mention, incorrect date is mentioned in Finder when the file is edited. Hence can we have a remote connect session at any convenient time to you to further debug the issue and try resolving the issue on your machine.
Regards,
Nayan
Dreamweaver Team
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