+ * Prefer the function formatted_datetime below.
+ */
+std::string const formatted_time(time_t t, std::string const & fmt);
+
+/** Returns a locale-dependent formatting of the date and time encoded in \c t
+ * The \p fmt string holds the formatting arguments of QDateTime::toString().
+ * If fmt is empty then the formatting of the date and time is itself according
+ * to the locale.
+ */
+docstring formatted_datetime(time_t t, std::string const & fmt = "");
+
+/**
+ * Inverse of asctime(gmtime()).