In c# how does one set the value of the AD property "pwdLastSet"

In c# how does one set the value of the AD property "pwdLastSet"

This is not working:

DateTime passwordLastSetTarg  = System.DateTime.Now.AddHours( -25 );

var adDate                    = userToActOn.ADEntry.Properties[ "pwdLastSet" ].Value;
long filetime                 = passwordLastSetTarg.ToFileTimeUtc();

userToActOn.ADEntry.Properties开发者_运维百科[ "pwdLastSet" ][ 0 ] = filetime;

This is closely related to my last question, but I hope it's not redundant, if so sorry.

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You can't set it to a date - only to 0 (expires now) or -1 (reset the time to 'now' )

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Unless I'm misreading the MSDN docs, this is a read-only property - as I'd have expected it would be. It's up to AD to set this as and when a user changes their password.