UTC conversion improvements

VITObelgium · Aug 27, 2024 · c64dff0 · c64dff0
1 parent ae3c85e
commit c64dff0
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Showing 3 changed files with 37 additions and 44 deletions.
diff --git a/chrono.cpp b/chrono.cpp
@@ -175,30 +175,33 @@ std::optional<local_time_point> local_time_point_from_string(std::string_view st
 }
 
 #ifdef HAVE_CPP20_CHRONO
-std::optional<time_point> localtime_to_utc(time_point dt, std::chrono::choose* choice)
+std::optional<time_point> localtime_to_utc(local_time_point dt, std::optional<choose> choice)
 {
-    auto ymd = chrono::to_year_month_day(dt);
-    auto tod = chrono::time_of_day(dt); // Yields time_of_day type
+    if (choice.has_value()) {
+        return localtime_to_utc(zoned_time(std::chrono::current_zone(), dt, *choice));
+    } else {
+        return localtime_to_utc(zoned_time(std::chrono::current_zone(), dt));
+    }
+}
 
-    auto tp = std::chrono::local_days{ymd} + tod.hours() + tod.minutes() + tod.seconds();
-    auto z  = std::chrono::current_zone();
+std::optional<time_point> localtime_to_utc(zoned_time zt)
+{
+    auto localTimePoint = zt.get_local_time();
 
     std::optional<time_point> utcTime;
-    auto i = z->get_info(tp);
+    auto i = zt.get_time_zone()->get_info(localTimePoint);
     switch (i.result) {
     case std::chrono::local_info::unique: {
-        std::chrono::zoned_time<std::chrono::seconds> zt(z, tp); //"Europe/Brussels"
         utcTime = std::optional<time_point>(zt.get_sys_time());
         break;
     }
     case std::chrono::local_info::ambiguous: {
-        if (choice) {
-            std::chrono::zoned_time<std::chrono::seconds> zt(z, tp, *choice);
-            utcTime = std::optional<time_point>(zt.get_sys_time());
-        }
+        Log::warn("Ambiguous time point, taking the latest option");
+        utcTime = std::optional<time_point>(i.second.begin);
         break;
     }
     case std::chrono::local_info::nonexistent:
+        Log::error("Non existing timepoint");
         break;
     default:
         break;
@@ -207,7 +210,7 @@ std::optional<time_point> localtime_to_utc(time_point dt, std::chrono::choose* c
     return utcTime;
 }
 #else
-std::optional<time_point> localtime_to_utc(time_point dt, date::choose* choice)
+std::optional<time_point> localtime_to_utc(local_time_point dt, std::optional<choose> choice)
 {
     auto ymd = chrono::to_year_month_day(dt);
     auto tod = chrono::time_of_day(dt); // Yields time_of_day type

diff --git a/chrono.natvis b/chrono.natvis
@@ -1,31 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
 <AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
     <Type Name="std::chrono::time_point&lt;std::chrono::system_clock,std::chrono::duration&lt;__int64,std::ratio&lt;1,10000000&gt; &gt; &gt;">
-        <DisplayString>
-            year: {
-            1969 +
-            4 * (((_MyDur._MyRep / (24 * 60 * 60 * 10000000ull)) + 365) / (365 * 3 + 366)) +
-            (((_MyDur._MyRep / (24 * 60 * 60 * 10000000ull)) + 365) % (365 * 3 + 366) &lt;= (3 * 365) ? (((_MyDur._MyRep / (24 * 60 * 60 * 10000000ull)) + 365) % (365 * 3 + 366)) / 365 : 3)
-            } DoY: {
-            ((_MyDur._MyRep / (24 * 60 * 60 * 10000000ull)) + 365) % (365 * 3 + 366) &lt;= (3 * 365) ? (((_MyDur._MyRep / (24 * 60 * 60 * 10000000ull)) + 365) % (365 * 3 + 366)) % 365 : (((_MyDur._MyRep / (24 * 60 * 60 * 10000000ull)) + 365) % (365 * 3 + 366)) - 365 * 3
-            } {
-            (_MyDur._MyRep % (24 * 60 * 60 * 10000000ull))/(10 * 60 * 60 * 10000000ull)}{(_MyDur._MyRep % (4 * 60 * 60 * 10000000ull))/(60 * 60 * 10000000ull)}:{(_MyDur._MyRep % (60 * 60 * 10000000ull))/(10 * 60 * 10000000ull)}{(_MyDur._MyRep % (10 * 60 * 10000000ull)) / (60 * 10000000ull)}:{(_MyDur._MyRep % (60 * 10000000ull)) / (10 * 10000000ull)}{(_MyDur._MyRep % (10 * 10000000ull)) / 10000000ull}.{(_MyDur._MyRep % 10000000) / 1000000}{(_MyDur._MyRep % 1000000) / 100000}{(_MyDur._MyRep % 100000) / 10000}{(_MyDur._MyRep % 10000) / 1000}{(_MyDur._MyRep % 1000) / 100}{(_MyDur._MyRep % 100) / 10}{_MyDur._MyRep % 10
-            } hh:mm:ss
-        </DisplayString>
-        <Expand/>
+        <!-- This won't display dates outside of the range of 1901 to 2099 properly (leap years are dumb), but for dates around the present it's fine-->
+        <DisplayString>{1968+4*((_MyDur._MyRep/864000000000ll+731)/1461)+((((_MyDur._MyRep/864000000000ll+731)%1461)&lt;366)?0:(((_MyDur._MyRep/864000000000ll+731)%1461-1)/365))}/{char(((((_MyDur._MyRep/864000000000ll+731)%1461-1)%365&lt;59)?((((_MyDur._MyRep/864000000000ll+731)%1461-1)%365+(((((_MyDur._MyRep/864000000000ll)+731)%1461)&lt;366)?1:0))/31+1):(3+(((((_MyDur._MyRep/864000000000ll+731)%1461-1)%365)-59)/153)*5+(((((_MyDur._MyRep/864000000000ll+731)%1461-1)%365)-59)%153)/61*2+(((((_MyDur._MyRep/864000000000ll+731)%1461-1)%365)-59)%153)%61/31))%10+((((_MyDur._MyRep/864000000000ll+731)%1461-1)%365&lt;59)?((((_MyDur._MyRep/864000000000ll+731)%1461-1)%365+(((((_MyDur._MyRep/864000000000ll)+731)%1461)&lt;366)?1:0))/31+1):(3+(((((_MyDur._MyRep/864000000000ll+731)%1461-1)%365)-59)/153)*5+(((((_MyDur._MyRep/864000000000ll+731)%1461-1)%365)-59)%153)/61*2+(((((_MyDur._MyRep/864000000000ll+731)%1461-1)%365)-59)%153)%61/31))/10*16),nvoxb}/{char(((((_MyDur._MyRep/864000000000ll+731)%1461-1)%365&lt;59)?((((_MyDur._MyRep/864000000000ll+731)%1461-1)%365+(((((_MyDur._MyRep/864000000000ll)+731)%1461)&lt;366)?1:0))%31+1):((((((_MyDur._MyRep/864000000000ll+731)%1461-1)%365)-59)%153)%61%31+1))%10+((((_MyDur._MyRep/864000000000ll+731)%1461-1)%365&lt;59)?((((_MyDur._MyRep/864000000000ll+731)%1461-1)%365+(((((_MyDur._MyRep/864000000000ll)+731)%1461)&lt;366)?1:0))%31+1):((((((_MyDur._MyRep/864000000000ll+731)%1461-1)%365)-59)%153)%61%31+1))/10*16),nvoxb} {char(((_MyDur._MyRep/36000000000ll)%24)%10+((_MyDur._MyRep/36000000000ll)%24)/10*16),nvoxb}:{char(((_MyDur._MyRep/600000000ll)%60)%10+((_MyDur._MyRep/600000000ll)%60)/10*16),nvoxb}:{char(((_MyDur._MyRep/10000000ll)%60)%10+((_MyDur._MyRep/10000000ll)%60)/10*16),nvoxb}.{short((_MyDur._MyRep/1000)%10+((_MyDur._MyRep/10000)%10)*16+((_MyDur._MyRep/100000)%10)*256+((_MyDur._MyRep/1000000)%10)*4096),nvoxb}</DisplayString>
     </Type>
     <Type Name="std::chrono::time_point&lt;std::chrono::system_clock,std::chrono::duration&lt;__int64,std::ratio&lt;1,1000&gt; &gt; &gt;">
-        <DisplayString>
-            year: {
-            1969 +
-            4 * (((_MyDur._MyRep / (24 * 60 * 60 * 1000ull)) + 365) / (365 * 3 + 366)) +
-            (((_MyDur._MyRep / (24 * 60 * 60 * 1000ull)) + 365) % (365 * 3 + 366) &lt;= (3 * 365) ? (((_MyDur._MyRep / (24 * 60 * 60 * 1000ull)) + 365) % (365 * 3 + 366)) / 365 : 3)
-            } DoY: {
-            ((_MyDur._MyRep / (24 * 60 * 60 * 1000ull)) + 365) % (365 * 3 + 366) &lt;= (3 * 365) ? (((_MyDur._MyRep / (24 * 60 * 60 * 1000ull)) + 365) % (365 * 3 + 366)) % 365 : (((_MyDur._MyRep / (24 * 60 * 60 * 1000ull)) + 365) % (365 * 3 + 366)) - 365 * 3
-            } {
-            (_MyDur._MyRep % (24 * 60 * 60 * 1000ull))/(10 * 60 * 60 * 1000ull)}{(_MyDur._MyRep % (4 * 60 * 60 * 1000ull))/(60 * 60 * 1000ull)}:{(_MyDur._MyRep % (60 * 60 * 1000ull))/(10 * 60 * 1000ull)}{(_MyDur._MyRep % (10 * 60 * 1000ull)) / (60 * 1000ull)}:{(_MyDur._MyRep % (60 * 1000ull)) / (10 * 1000ull)}{(_MyDur._MyRep % (10 * 1000ull)) / 1000ull}.{(_MyDur._MyRep % 1000) / 100}{(_MyDur._MyRep % 100) / 10
-            } hh:mm:ss
-        </DisplayString>
+        <DisplayString>{1968+4*((_MyDur._MyRep/86400000ll+731)/1461)+((((_MyDur._MyRep/86400000ll+731)%1461)&lt;366)?0:(((_MyDur._MyRep/86400000ll+731)%1461-1)/365))}/{char(((((_MyDur._MyRep/86400000ll+731)%1461-1)%365&lt;59)?((((_MyDur._MyRep/86400000ll+731)%1461-1)%365+(((((_MyDur._MyRep/86400000ll)+731)%1461)&lt;366)?1:0))/31+1):(3+(((((_MyDur._MyRep/86400000ll+731)%1461-1)%365)-59)/153)*5+(((((_MyDur._MyRep/86400000ll+731)%1461-1)%365)-59)%153)/61*2+(((((_MyDur._MyRep/86400000ll+731)%1461-1)%365)-59)%153)%61/31))%10+((((_MyDur._MyRep/86400000ll+731)%1461-1)%365&lt;59)?((((_MyDur._MyRep/86400000ll+731)%1461-1)%365+(((((_MyDur._MyRep/86400000ll)+731)%1461)&lt;366)?1:0))/31+1):(3+(((((_MyDur._MyRep/86400000ll+731)%1461-1)%365)-59)/153)*5+(((((_MyDur._MyRep/86400000ll+731)%1461-1)%365)-59)%153)/61*2+(((((_MyDur._MyRep/86400000ll+731)%1461-1)%365)-59)%153)%61/31))/10*16),nvoxb}/{char(((((_MyDur._MyRep/86400000ll+731)%1461-1)%365&lt;59)?((((_MyDur._MyRep/86400000ll+731)%1461-1)%365+(((((_MyDur._MyRep/86400000ll)+731)%1461)&lt;366)?1:0))%31+1):((((((_MyDur._MyRep/86400000ll+731)%1461-1)%365)-59)%153)%61%31+1))%10+((((_MyDur._MyRep/86400000ll+731)%1461-1)%365&lt;59)?((((_MyDur._MyRep/86400000ll+731)%1461-1)%365+(((((_MyDur._MyRep/86400000ll)+731)%1461)&lt;366)?1:0))%31+1):((((((_MyDur._MyRep/86400000ll+731)%1461-1)%365)-59)%153)%61%31+1))/10*16),nvoxb} {char(((_MyDur._MyRep/3600000ll)%24)%10+((_MyDur._MyRep/3600000ll)%24)/10*16),nvoxb}:{char(((_MyDur._MyRep/60000ll)%60)%10+((_MyDur._MyRep/60000ll)%60)/10*16),nvoxb}:{char(((_MyDur._MyRep/1000ll)%60)%10+((_MyDur._MyRep/1000ll)%60)/10*16),nvoxb}.{short((_MyDur._MyRep/1000)%10+((_MyDur._MyRep/10000)%10)*16+((_MyDur._MyRep/100000)%10)*256+((_MyDur._MyRep/1000000)%10)*4096),nvoxb}</DisplayString>
         <Expand/>
     </Type>
 </AutoVisualizer>
diff --git a/include/infra/chrono.h b/include/infra/chrono.h
@@ -30,6 +30,8 @@ using year_month_day = std::chrono::year_month_day;
 using sys_days       = std::chrono::sys_days;
 using date_point     = std::chrono::time_point<std::chrono::system_clock, days>;
 using time_point     = std::chrono::time_point<std::chrono::system_clock, std::chrono::milliseconds>;
+using zoned_time     = std::chrono::zoned_time<std::chrono::milliseconds>;
+using utc_clock      = std::chrono::utc_clock;
 
 using local_seconds    = std::chrono::local_seconds;
 using local_date_point = std::chrono::local_days;
@@ -57,6 +59,8 @@ using year_month_day = date::year_month_day;
 using sys_days       = date::sys_days;
 using date_point     = std::chrono::time_point<std::chrono::system_clock, days>;
 using time_point     = std::chrono::time_point<std::chrono::system_clock, std::chrono::milliseconds>;
+using zoned_time     = date::zoned_time<std::chrono::milliseconds>;
+using utc_clock      = date::utc_clock;
 
 using local_seconds    = date::local_seconds;
 using local_date_point = date::local_days;
@@ -88,6 +92,7 @@ local_date_point date_from_time_point(local_time_point tp);
 #ifdef HAVE_CPP20_CHRONO
 std::chrono::hh_mm_ss<std::chrono::milliseconds> time_of_day(time_point tp);
 std::chrono::hh_mm_ss<std::chrono::milliseconds> time_of_day(local_time_point tp);
+
 std::chrono::year_month_day to_year_month_day(time_point tp);
 std::chrono::year_month_day to_year_month_day(local_time_point tp);
 
@@ -134,8 +139,13 @@ std::string to_string(local_time_point tp);
 template <typename Clock, typename Duration>
 std::string to_string(std::string_view format, std::chrono::time_point<Clock, Duration> tp)
 {
-    std::time_t time = Clock::to_time_t(tp);
-    return fmt::format(fmt::runtime(fmt::format("{{:{}}}", format)), fmt::localtime(time));
+    if constexpr (std::is_same_v<Clock, utc_clock>) {
+        std::time_t time = std::chrono::system_clock::to_time_t(utc_clock::to_sys(tp));
+        return fmt::format(fmt::runtime(fmt::format("{{:{}}}", format)), tp);
+    } else {
+        std::time_t time = Clock::to_time_t(tp);
+        return fmt::format(fmt::runtime(fmt::format("{{:{}}}", format)), fmt::localtime(time));
+    }
 }
 
 /*! Converts a string to a time point using the provided format specification
@@ -157,8 +167,11 @@ std::string to_utc_string(std::chrono::time_point<Clock, Duration> tp)
 template <typename Clock, typename Duration>
 std::string to_utc_string(std::string_view format, std::chrono::time_point<Clock, Duration> tp)
 {
-    std::time_t time = Clock::to_time_t(tp);
-    return fmt::format(fmt::runtime(fmt::format("{{:{}}}", format)), fmt::gmtime(time));
+    if constexpr (std::is_same_v<Clock, utc_clock>) {
+        return fmt::format(fmt::runtime(fmt::format("{{:{}}}", format)), tp);
+    } else {
+        return fmt::format(fmt::runtime(fmt::format("{{:{}}}", format)), fmt::gmtime(tp));
+    }
 }
 
 inline std::string to_string(std::string_view format, chrono::local_time_point tp)
@@ -172,11 +185,8 @@ inline std::string to_string(std::string_view format, chrono::local_time_point t
 #endif
 }
 
-#ifdef HAVE_CPP20_CHRONO
-std::optional<time_point> localtime_to_utc(time_point dt, std::chrono::choose* choice = nullptr);
-#else
-std::optional<time_point> localtime_to_utc(time_point dt, date::choose* choice = nullptr);
-#endif
+std::optional<time_point> localtime_to_utc(local_time_point dt, std::optional<choose> choice);
+std::optional<time_point> localtime_to_utc(zoned_time tp);
 
 class DurationRecorder
 {