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Time Deltas

Timedeltas are differences in times, expressed in difference units, e.g. days, hours, minutes, seconds. They can be both positive and negative.

Timedelta is a subclass of datetime.timedelta, and behaves in a similar manner, but allows compatibility with np.timedelta64 types as well as a host of custom representation, parsing, and attributes.

Parsing

You can construct a Timedelta scalar through various arguments:

# strings
In [1]: pd.Timedelta('1 days')
Out[1]: Timedelta('1 days 00:00:00')

In [2]: pd.Timedelta('1 days 00:00:00')

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http://pandas.pydata.org/pandas-docs/version/0.22.0/timedeltas.html