numpy.busday_count(begindates, enddates, weekmask='1111100', holidays=[], busdaycal=None, out=None)

Counts the number of valid days between begindates and enddates, not including the day of enddates.

If enddates specifies a date value that is earlier than the corresponding begindates date value, the count will be negative.

New in version 1.7.0.


begindates : array_like of datetime64[D]

The array of the first dates for counting.

enddates : array_like of datetime64[D]

The array of the end dates for counting, which are excluded from the count themselves.

weekmask : str or array_like of bool, optional

A seven-element array indicating which of Monday through Sunday are valid days. May be specified as a length-seven list or array, like [1,1,1,1,1,0,0]; a length-seven string, like ‘1111100’; or a string like “Mon Tue Wed Thu Fri”, made up of 3-character abbreviations for weekdays, optionally separated by white space. Valid abbreviations are: Mon Tue Wed Thu Fri Sat Sun

holidays : array_like of datetime64[D], optional

An array of dates to consider as invalid dates. They may be specified in any order, and NaT (not-a-time) dates are ignored. This list is saved in a normalized form that is suited for fast calculations of valid days.

busdaycal : busdaycalendar, optional

A busdaycalendar object which specifies the valid days. If this parameter is provided, neither weekmask nor holidays may be provided.

out : array of int, optional

If provided, this array is filled with the result.


out : array of int

An array with a shape from broadcasting begindates and enddates together, containing the number of valid days between the begin and end dates.

See also

An object that specifies a custom set of valid days.
Returns a boolean array indicating valid days.
Applies an offset counted in valid days.


>>> # Number of weekdays in January 2011
... np.busday_count('2011-01', '2011-02')
>>> # Number of weekdays in 2011
...  np.busday_count('2011', '2012')
>>> # Number of Saturdays in 2011
... np.busday_count('2011', '2012', weekmask='Sat')

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