很接近！
In [1]: df = DataFrame(randn(5,2),index=date_range('20130101',periods=5))
In [3]: df['date'] = Timestamp('20130102')
In [4]: df
Out[4]:
0 1 date
2013-01-01 2.406932 -0.313473 2013-01-02 00:00:00
2013-01-02 0.034162 -0.708450 2013-01-02 00:00:00
2013-01-03 -1.585031 0.587243 2013-01-02 00:00:00
2013-01-04 1.454818 1.089208 2013-01-02 00:00:00
2013-01-05 -0.778016 -0.994242 2013-01-02 00:00:00
In [5]: df['td'] = df['date']-df.index.to_series()
In [6]: df
Out[6]:
0 1 date td
2013-01-01 2.406932 -0.313473 2013-01-02 00:00:00 1 days, 00:00:00
2013-01-02 0.034162 -0.708450 2013-01-02 00:00:00 00:00:00
2013-01-03 -1.585031 0.587243 2013-01-02 00:00:00 -1 days, 00:00:00
2013-01-04 1.454818 1.089208 2013-01-02 00:00:00 -2 days, 00:00:00
2013-01-05 -0.778016 -0.994242 2013-01-02 00:00:00 -3 days, 00:00:00
602392714
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