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https://www.powershellcenter.com/2021/03/09/manage-ad-user-logon-hours-using-powershell/
Changing any value from 1 to 0 or 0 to 1 is reflected in the Logon Hours GUI. Change the first bit in the first block, make it 0, and then see the result. In the first block, change the first bit to 01111111, click on OK to save, and open back the Logon Hours in the Account tab for the same user. Now there is one block that is now marked as white.
https://richardspowershellblog.wordpress.com/2012/01/26/setting-a-users-logon-hours/
The important point is how we represent the hours users can logon. The information is stored as a byte array – 3bytes per day with 1 bit per hour. We want to restrict the users to 8am-6pm Monday to Friday so we use. [byte []]$hours = @ (0,0,0,0,255,3,0,255,3,0,255,3,0,255,3,0,255,3,0,0,0)
https://community.spiceworks.com/topic/2266352-setting-ad-logon-hours-for-a-group
I've been able to set the logon hours to unrestricted for a single user using this: Powershell. $logonhours=@ {"Logonhours"= [byte []]$hours=@ (255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255)} Set-ADUSer " (USER NAME HERE)" -Replace $logonHours. When I change it to this:
https://social.technet.microsoft.com/Forums/Lync/en-US/3cfbf848-59cb-4040-b34b-fb50ffa2c87c/powershell-command-to-set-logon-hours-status-to-denied
If you were to clear the logonHours attribute of a user, the user would be able to logon during all hours of the week. This is a default setting. Assuming you want to not allow the user to logon during any hour of the week, then you must assign a byte array of 21 zeros. The following PowerShell will do this for a user with sAMAccountName "jsmith".
https://docs.microsoft.com/en-us/powershell/module/activedirectory/set-aduser
This example sets the user logon hours to Monday through Friday from 8:00 AM to 5:00 PM and adds a description. It updates the logonHours attribute with the specified byte array and the description attribute with the specified string. Example 7: Set a property for a user
http://www.rlmueller.net/SetLogonHours.htm
Set LogonHours. A PowerShell script has been developed to assign the logonHours property of users from the information in an input file. The input file is a comma delimited file, specifying the Distinguished Names of the users, and 7 binary strings for each user designating the hours in the week when the user is allowed to logon to the domain. Each binary string has 24 bits for the 24 hours in a day.
https://stackoverflow.com/questions/53765027/how-to-set-logon-hours-to-logon-denied-in-activedirectory-using-powershell
So best to make template user, then pull the values from that. I wrote this that will give you what you need: $hours = get-aduser TempUserYouCreatedToGetItSetTheWayYouWanted -property logonhours | select -ExpandProperty logonhours $Counter = 0 $HoursString = " [byte []]`$hours = @ (" foreach ($h in $hours) { if ($Counter -gt 0) { $HoursString = $HoursString + "," } $HoursString = …
https://mctexpert.blogspot.com/2011/05/how-to-change-logon-hours-of-all.html
Right click a user account and select Properties. Click the Account tab. Now click the Logon Hours… button. Below is an image of the logon hours graphic: In order to use PowerShell to configure the logon hours, we need to break the each of the 7 days down into 3 blocks of 8 hours.
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