julian+This is a Julian calendar in the style of +date.h. +Everthing is the same here as for +date.h, +except that the calendrical arithmetic implements a proleptic Julian calendar. +
+ +
+The julian calendar can interoperate with
+date.h and tz.h just by
+paying attention to the namespace. For example to convert the civil
+date 2016_y/jun/26 to a julian date, just do:
+
+#include "julian.h"
+#include <iostream>
+
+int
+main()
+{
+ using namespace date::literals;
+ std::cout << julian::year_month_day{2016_y/jun/26} << '\n';
+}
++This outputs: +
+ ++ ++2016-06-13 +
+And here is the reverse conversion: +
+ +
+#include "julian.h"
+#include <iostream>
+
+int
+main()
+{
+ using namespace julian::literals;
+ std::cout << date::year_month_day{2016_y/jun/13} << '\n';
+}
++Which outputs: +
+ ++ ++2016-06-26 +
+You can even convert directly to the ISO-week-based calendar: +
+ +
+#include "iso_week.h"
+#include "julian.h"
+#include <iostream>
+
+int
+main()
+{
+ using namespace julian::literals;
+ std::cout << iso_week::year_weeknum_weekday{2016_y/jun/13} << '\n';
+}
++Which outputs: +
+ ++ ++2016-W25-Sun +
+ +
+You can find the current local julian date and time with: +
+ +
+#include "julian.h"
+#include "tz.h"
+#include <iostream>
+
+int
+main()
+{
+ auto zt = date::make_zoned(date::current_zone(), std::chrono::system_clock::now());
+ auto ld = date::floor<date::days>(zt.get_local_time());
+ julian::year_month_day ymd{ld};
+ auto time = date::make_time(zt.get_local_time() - ld);
+ std::cout << ymd << ' ' << time << '\n';
+}
++Example output: +
+ ++ + + ++2016-06-13 18:38:30.049598 +