auto const from_string = from.date() + " " + from.time_of_day(true, false);
auto const until_string = until.date() + " " + until.time_of_day(true, false);
auto const from_string = from.date() + " " + from.time_of_day(true, false);
auto const until_string = until.date() + " " + until.time_of_day(true, false);