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## Class template dst_day_calc_rule

boost::date_time::dst_day_calc_rule — Defines base interface for calculating start and end date of daylight savings.

## Synopsis

    // In header: <boost/date_time/dst_transition_generators.hpp>

    template<typename date_type>
    class dst_day_calc_rule {
    public:
      // types
      typedef date_type::year_type year_type;

      // construct/copy/destruct
      ~dst_day_calc_rule();

      // public member functions
      virtual date_type start_day(year_type) const = 0;
      virtual std::string start_rule_as_string() const = 0;
      virtual date_type end_day(year_type) const = 0;
      virtual std::string end_rule_as_string() const = 0;
    };

## Description

### `dst_day_calc_rule` public construct/copy/destruct

1.     ~dst_day_calc_rule();

### `dst_day_calc_rule` public member functions

1.     virtual date_type start_day(year_type y) const = 0;

2.     virtual std::string start_rule_as_string() const = 0;

3.     virtual date_type end_day(year_type y) const = 0;

4.     virtual std::string end_rule_as_string() const = 0;