Example usage of custom_time_zone as well as posix_time_zone. int main() { using namespace boost; using namespace local_time; using namespace gregorian; using posix_time::time_duration; /***** custom_time_zone *****/ // create the dependent objects for a custom_time_zone time_zone_names tzn("Eastern Standard Time", "EST", "Eastern Daylight Time", "EDT"); time_duration utc_offset(-5,0,0); dst_adjustment_offsets adj_offsets(time_duration(1,0,0), time_duration(2,0,0), time_duration(2,0,0)); // rules for this zone are: // start on first Sunday of April at 2 am // end on last Sunday of October at 2 am // so we use a first_last_dst_rule first_day_of_the_week_in_month start_rule(Sunday, Apr); last_day_of_the_week_in_month end_rule(Sunday, Oct); shared_ptr nyc_rules(new first_last_dst_rule(start_rule, end_rule)); // create more dependent objects for a non-dst custom_time_zone time_zone_names tzn2("Mountain Standard Time", "MST", "", ""); // no dst means empty dst strings time_duration utc_offset2(-7,0,0); dst_adjustment_offsets adj_offsets2(time_duration(0,0,0), time_duration(0,0,0), time_duration(0,0,0)); // no dst means we need a null pointer to the rules shared_ptr phx_rules; // create the custom_time_zones time_zone_ptr nyc_1(new custom_time_zone(tzn, utc_offset, adj_offsets, nyc_rules)); time_zone_ptr phx_1(new custom_time_zone(tzn2, utc_offset2, adj_offsets2, phx_rules)); /***** posix_time_zone *****/ // create posix_time_zones that are the duplicates of the // custom_time_zones created above. See posix_time_zone documentation // for details on full zone names. std::string nyc_string, phx_string; nyc_string = "EST-05:00:00EDT+01:00:00,M4.1.0/02:00:00,M10.5.0/02:00:00"; // nyc_string = "EST-05EDT,M4.1.0,M10.5.0"; // shorter when defaults used phx_string = "MST-07"; // no-dst time_zone_ptr nyc_2(new posix_time_zone(nyc_string)); time_zone_ptr phx_2(new posix_time_zone(phx_string)); /***** show the sets are equal *****/ std::cout << "The first zone is in daylight savings from:\n " << nyc_1->dst_local_start_time(2004) << " through " << nyc_1->dst_local_end_time(2004) << std::endl; std::cout << "The second zone is in daylight savings from:\n " << nyc_2->dst_local_start_time(2004) << " through " << nyc_2->dst_local_end_time(2004) << std::endl; std::cout << "The third zone (no daylight savings):\n " << phx_1->std_zone_abbrev() << " and " << phx_1->base_utc_offset() << std::endl; std::cout << "The fourth zone (no daylight savings):\n " << phx_2->std_zone_abbrev() << " and " << phx_2->base_utc_offset() << std::endl; return 0; } ]]>