Day of the week: Difference between revisions

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 =={{header|C++}}==
-<syntaxhighlight lang="cpp">#include <boost/date_time/gregorian/gregorian.hpp>
+<syntaxhighlight lang="cpp">#include <chrono>
+#include <ranges>
 #include <iostream>
-int main( ) {
+int main() {
+    std::cout << "Yuletide holidays must be allowed in the following years:\n";
-   using namespace boost::gregorian ;
+    for (int year : std::views::iota(2008, 2121)
+               | std::views::filter([](auto year) {
-   std::cout
+                    if (std::chrono::weekday{
-      << "Yuletide holidays must be allowed in the following years:\n" ;
+                            std::chrono::year{year}/std::chrono::December/25}
-   for ( int i = 2008 ; i < 2121 ; i++ ) {
+                            == std::chrono::Sunday) {
-      greg_year gy = i ;
-      date d  ( gy, Dec , 25 ) ;
+                        return true;
-      if ( d.day_of_week( ) == Sunday ) {
+                    }
+                    return false;
-	 std::cout << i << std::endl ;
-      }
+                })) {
+        std::cout << year << '\n';
-   }
+    }
-   std::cout << "\n" ;
-   return 0 ;
 }</syntaxhighlight>
 {{out}}