Get["/facebook/top/{year:year}"] = parameters =>
{
    int year = parameters.year;
    //whole year

    var firstDay = new DateTime(year, 1, 1);
    var lastDay = firstDay.AddMonths(12).AddMilliseconds(-1);

    return GetPostsForPeriod($"Top posty z Facebooka z roku {year}", firstDay, lastDay);
};

Get["/facebook/top/{year:year}/{month:month}"] = parameters =>
{
    int month = parameters.month;
    int year = parameters.year;

    var firstDay = new DateTime(year, month, 1);
    var lastDay = firstDay.AddMonths(1).AddMilliseconds(-1);

    return GetPostsForPeriod($"Top posty z Facebooka z okresu {firstDay:yyyy-MM-dd} - {lastDay:yyyy-MM-dd}", firstDay, lastDay);