utils: Rename/Add date functions

utils.cpp

@@ -166,7 +166,10 @@ std::string utils::regex_callback_replacer(std::regex regex, const std::string &
 	return result;
 }
 
-std::string utils::toISODate(time_t t)
+/* TODO: Convert to C++20, but currently the state is rather poor and would
+ * require workarounds, so keep it this way for now, and do it properly
+ * once compiler support gets there */
+std::string utils::formatLocalDate(time_t t, std::string format)
 {
 	struct tm lt;
 	if(localtime_r(&t, &lt) == nullptr)
@@ -174,7 +177,7 @@ std::string utils::toISODate(time_t t)
 		return {};
 	}
 	char result[20];
-	size_t x = strftime(result, sizeof(result), "%Y-%m-%d %H:%M:%S", &lt);
+	size_t x = strftime(result, sizeof(result), format.c_str(), &lt);
 	if(x == 0)
 	{
 		return {};
@@ -182,6 +185,16 @@ std::string utils::toISODate(time_t t)
 	return std::string{result};
 }
 
+std::string utils::toISODateTime(time_t t)
+{
+	return utils::formatLocalDate(t, "%Y-%m-%d %H:%M:%S");
+}
+
+std::string utils::toISODate(time_t t)
+{
+	return utils::formatLocalDate(t, "%Y-%m-%d");
+}
+
 std::string utils::trim(std::string_view view)
 {
 	std::string_view chars = " \t\n\r";

utils.h

@@ -81,7 +81,9 @@ inline unsigned int toUInt(const std::string &str)
 	return result;
 }
 
+std::string formatLocalDate(time_t t, std::string format);
 std::string toISODate(time_t t);
+std::string toISODateTime(time_t t);
 
 template <class T> inline std::string toString(const T &v)
 {