MSN 小問題 .........請各位幫忙解答 Thx.....

I don't think so.

1. You may try MSN extension like http://www.msgpluslive.net,
which records many times for you (like "last seen online", available from "contact information"), but the latest version of it seems does not record the time you added other people or being added

2. Yes, as other have suggested, you can check the chat history to give an "earliest bound" (i.e. a time that would not be earlier than the actual adding time) when you added your friend, provided that you 2 have chatted.

雖然係唔可以睇返實則邊日add佢.....
但係你有冇印象係咪add佢果日你地就傾計呢 ?
如果你add左佢果日有傾計
咁樣check下你地個迅息記錄....咪知邊日lor

而家唔可以睇番究竟係幾時add佢

唔可以.因為無呢個功能.
你可以係add佢o既時候mark down個時間.