from SO and previous discussions
currently you cannot subtract 2 datetimeindexes ('-' is actually a set op). This is the ONLY valid numerical type of operation (e.g. you cannot add dti).
We current support pretty much the fully gamut of obvious ops, with dti-dti being the exception.
full list of tests are here: https://github.com/pydata/pandas/blob/master/pandas/tseries/tests/test_base.py#L434
I will propose
dti.sub(dti) to rectify this
thoughts
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