How to check OS install dates for quarantined statuses.
Check OS Installation Dates on Windows
Hold down the Windows Key and Press R on your keyboard.
- Type in cmd and Press CTRL + SHIFT + ENTER.
- Type in systeminfo and Press ENTER.
Check OS Installation Dates on macOS (Yosemite and El Capitan)
- Open the console window in the Utilities folder, as outlined above.
- Navigate to /var/log, then click on install.log
- Scroll all the way to the top of the list, until you see a series of text that says "OSInstaller"
- The date next to the text is the install date.
Check OS Installation Dates on macOS (Catalina)
- Open the console application found in Applications > Utilities
- In the sidebar select "Log Reports"
- In the top half of the window select "install.log"
The lower half of the log window scroll up to the earliest possible date to see the install date.
The earliest date will either be when the computer was first set after being purchased or from the last clean install. If a computer is upgraded there will be an install log on the date of the install recording the upgrade.