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Subtracts a month from a date. The value must be of the form {{Y,M,D},{H,I,S}}.

For example:

{{ value|sub_month }}

When the value is {{2008,12,10},{15,30,0}} then the output is {{2008,11,10},{15,30,0}}.

The filter has an optional argument which defines the number of months to subtract:

For example:

{{ value|sub_month:3 }}

When the value is {{2008,12,10},{15,30,0}} then the output is {{2008,12,7},{15,30,0}}.

.. seealso:: :ref:`filter-sub_day`, :ref:`filter-sub_week`, :ref:`filter-add_month`, :ref:`filter-sub_year`