app/concerns/tt_query_operators.rb
module TtQueryOperators
# following two methods are a workaround to implement some custom filters to the date-filter without rewriting
# Query-class and JS-methods for filter-build completely
def self.operators_labels
super.merge '!*' => l(:time_tracker_label_this_month)
end
def self.operators_by_filter_type
super.merge :date => %w(= >< t w !* *)
end
end