Unable to Restore a Database to a previous point in time from a Full Backup Set
You didn't say what backups you have. If you only have a full backup, then there's no point-i-time restore. It can only be restored to the "snapshot in time" it reflects (towards the end of the backup period).

If you do have also transaction log backups, then I agree that you should test SSMS and see what RESTORE commands it generates (you have a script button to see the TSQL) and then take it from there.