An example is best:
2 Inn: df = P.DataFrame(index=P.date_range('2014-9-6 1:30', '2014-9-9', freq='6H'))
3 Inn: df
3 Out:
2014-09-06 01:30:00
2014-09-06 07:30:00
2014-09-06 13:30:00
2014-09-06 19:30:00
2014-09-07 01:30:00
2014-09-07 07:30:00
2014-09-07 13:30:00
2014-09-07 19:30:00
2014-09-08 01:30:00
2014-09-08 07:30:00
2014-09-08 13:30:00
2014-09-08 19:30:00
2014-09-09 01:30:00
4 Inn: df.index.asof('2014-9-8') # wrong
4 Out: Timestamp('2014-09-08 00:00:00')
5 Inn: df.index.asof(P.to_datetime('2014-9-8')) # right
5 Out: Timestamp('2014-09-07 19:30:00', offset='6H')
7 Inn: P.version.version
7 Out: '0.14.1'
df.index.asof() appears to know how to handle datetime strings, but it cant
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