The retention period expiration date is set by modifying the access time of a file. In a UNIX command line, the access time can be modified through the touch command. Although there is no method of modifying the access time through Windows Explorer, you can modify the access time through Windows Powershell. Accessing a file does not set the retention period expiration date.
If you run the touch command on a file in a SmartLock directory without specifying a date on which to release the file from a SmartLock state, and you commit the file, the retention period is automatically set to the default retention period specified for the SmartLock directory. If you have not specified a default retention period for the SmartLock directory, the file is assigned a retention period of zero seconds. It is recommended that you specify a minimum retention period for all SmartLock directories.