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}}.

See also

sub_day, sub_week, add_month, sub_year