diff -r bf159cf9f4b6 -r 127fb6a8f706 src/html.cpp
--- a/src/html.cpp	Sat Feb 01 13:59:01 2025 +0100
+++ b/src/html.cpp	Sat Feb 01 14:04:19 2025 +0100
@@ -27,6 +27,7 @@
 #include <cstdio>
 
 namespace chrono = std::chrono;
+using chrono::operator ""d;
 
 namespace html {
     static constexpr const char* weekdays[] = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
@@ -140,7 +141,7 @@
     unsigned colspans[12] = {};
     {
         unsigned total_cols = 0;
-        chrono::sys_days day{chrono::year_month_day{chrono::year{year}, chrono::month{1}, chrono::day{1}}};
+        chrono::sys_days day{chrono::year_month_day{chrono::year{year}, chrono::January, 1d}};
         if (chrono::weekday{day}.iso_encoding() != 1) {
             colspans[0] = 1;
             total_cols = 1;