I often look back on my university days,which i regard as th

I often look back on my university days,which i regard as the happiest of my life
为什么不能用WHEN,不是前面有my university days

看到时间词不一定就是状语啊!
I regard +时间+as
这里的时间就是前面的days,这里作动词regard的宾语.所以用which.
再如：I never forget the days which I spent in the park last year.
这里which代表前面的名词days,作从句动词spent的宾语.
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