当前，我有一系列的Datetime值显示为
0 Datetime
1 20041001
2 20041002
3 20041003
4 20041004
它们在一个名为
的系列中d['Datetime']
它们最初是类似 20041001ABCDEF 但是我只剩下最后的数字了。如何将它们设置为以下格式？
2004-10-01
答案 0 :(得分：1)
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