Converting the FileSystemObject's DateLastModified Property
Definition: Returns the date and time the file was last modified.
DateLastModified
To retrieve the last-modified date and time in PowerShell, you first need to retrieve a reference to the file by passing the name of the file to the Get-Item cmdlet. Then you can retrieve the last-modified date and time from the LastWriteTime property:
(Get-Item c:\scripts\test.txt).LastWriteTime
See conversions of other FileSystemObject methods and properties.
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