Add fromDateTime()

src/espchrono.cpp

@@ -133,7 +133,6 @@ local_clock::time_point utcToLocal(utc_clock::time_point ts)
 }
 #endif
 
-namespace {
 DateTime toDateTime(std::chrono::microseconds ts)
 {
     auto _time = ts.count();
@@ -189,7 +188,6 @@ DateTime toDateTime(std::chrono::microseconds ts)
     dateTime.dayOfWeek = dayOfWeek;
     return dateTime;
 }
-}
 
 DateTime toDateTime(utc_clock::time_point ts)
 {
@@ -204,6 +202,19 @@ LocalDateTime toDateTime(local_clock::time_point ts)
     return dateTime;
 }
 
+utc_clock::time_point fromDateTime(DateTime ts)
+{
+    const sys_days date = ts.date;
+    return utc_clock::time_point {
+        date.time_since_epoch()
+            + std::chrono::hours{ts.hour}
+            + std::chrono::minutes{ts.minute}
+            + std::chrono::seconds{ts.second}
+            + std::chrono::milliseconds{ts.millisecond}
+            + std::chrono::microseconds{ts.microsecond}
+        };
+}
+
 std::expected<DateTime, std::string> parseDateTime(std::string_view str)
 {
     // both valid:

src/espchrono.h

@@ -191,8 +191,10 @@ utc_clock::time_point localToUtc(local_clock::time_point local);
 local_clock::time_point utcToLocal(utc_clock::time_point ts);
 #endif
 
+DateTime toDateTime(std::chrono::microseconds ts);
 DateTime toDateTime(utc_clock::time_point ts);
 LocalDateTime toDateTime(local_clock::time_point ts);
+utc_clock::time_point fromDateTime(DateTime ts);
 
 std::expected<DateTime, std::string> parseDateTime(std::string_view str);