Long title, short post!  Just replace the highlighted portions with your own values.

(get-aduser -SearchBase "ou=Domain Users,dc=mydomain,dc=com" -filter * -properties whencreated) | where {$_.whencreated -ge [datetime]"1/1/2014"} | sort-object whencreated | ft sAMAccountName,Name,WhenCreated -autosize