Since C++ doesn't allow nesting pointers to members of a class, the simplest way to get a histogram for date components was to duplicate some of them as plain members

At the same time it was possible to convert month number to name.

cache.h

@@ -52,6 +52,10 @@ public:
 	std::string owner;
 	std::string owner_uuid;
 	std::tm date_found;
+	std::string year;
+	std::string mon;
+	std::string day;
+	std::string hour;
 
 	static Position home;
 

okapi.cpp

@@ -105,6 +105,7 @@ std::string Okapi::get_caches_json(std::string codes) {
 Caches Okapi::get_caches(std::vector<std::pair<std::string, std::tm>> codes) {
 	Cache c;
 	Caches cc;
+	char month[20];
 
 	uint n = 0;
 	while (n < codes.size()) {
@@ -135,6 +136,11 @@ Caches Okapi::get_caches(std::vector<std::pair<std::string, std::tm>> codes) {
 			for (auto& el2 : codes) {
 				if (el2.first == c.code) {
 					c.date_found = el2.second;
+					c.year = std::to_string(el2.second.tm_year);
+					std::strftime(month, 20, "%B", &el2.second);
+					c.mon = month;
+					c.day = std::to_string(el2.second.tm_mday);
+					c.hour = std::to_string(el2.second.tm_hour);
 					break;
 				}
 			}