format timestamps and place them on the right (#17)

discord/snowflake.cpp

@@ -1,4 +1,6 @@
 #include "snowflake.hpp"
+#include <ctime>
+#include <iomanip>
 
 Snowflake::Snowflake()
     : m_num(Invalid) {}
@@ -23,6 +25,16 @@ bool Snowflake::IsValid() const {
     return m_num != Invalid;
 }
 
+std::string Snowflake::GetLocalTimestamp() const {
+    const time_t secs_since_epoch = (m_num / 4194304000) + 1420070400;
+    const std::tm tm = *localtime(&secs_since_epoch);
+    std::stringstream ss;
+    const static std::locale locale("");
+    ss.imbue(locale);
+    ss << std::put_time(&tm, "%X %x");
+    return ss.str();
+}
+
 void from_json(const nlohmann::json &j, Snowflake &s) {
     if (j.is_string()) {
         std::string tmp;

discord/snowflake.hpp

@@ -10,6 +10,7 @@ struct Snowflake {
     Snowflake(const Glib::ustring &str);
 
     bool IsValid() const;
+    std::string GetLocalTimestamp() const;
 
     bool operator==(const Snowflake &s) const noexcept {
         return m_num == s.m_num;