Language C++ std::chrono::duration_cast (std::chrono::system_clock::now().time_since_epoch()).count() C# DateTimeOffset.UtcNow.ToUnixTimeMilliseconds() DateTime.UtcNow.Ticks / TimeSpan.TicksPerMillisecond; Dart DateTime.now().millisecondsSinceEpoch Go / Golang time.Now().UnixNano() / 1000000 Java / Groovy / Kotlin System.currentTimeMillis() Javascript Date.now() // or: new Date().getTime() MySQL..