Cleaner approach to generate timestamp string with no newline character

orchagent/portsorch.cpp

@@ -3120,18 +3120,18 @@ void PortsOrch::updateDbPortFlapCount(Port& port, sai_port_oper_status_t pstatus
     std::time_t now_c = std::chrono::system_clock::to_time_t(now);
     if (pstatus == SAI_PORT_OPER_STATUS_DOWN)
     {
-        // std::ctime returns a string with an unwanted newline character so we trim it
-        char * timeStr = std::ctime(&now_c);
-        timeStr[strlen(timeStr)-1] = '\0';
-        FieldValueTuple tuple("last_down_time", timeStr);
+        char buffer[32];
+        // Format: Www Mmm dd hh:mm:ss yyyy
+        std::strftime(buffer, sizeof(buffer), "%a %b %d %H:%M:%S %Y", std::localtime(&now_c));
+        FieldValueTuple tuple("last_down_time", buffer);
         tuples.push_back(tuple);
     } 
     else if (pstatus == SAI_PORT_OPER_STATUS_UP) 
     {
-        // std::ctime returns a string with an unwanted newline character so we trim it
-        char * timeStr = std::ctime(&now_c);
-        timeStr[strlen(timeStr)-1] = '\0';
-        FieldValueTuple tuple("last_up_time", timeStr);
+        char buffer[32];
+        // Format: Www Mmm dd hh:mm:ss yyyy
+        std::strftime(buffer, sizeof(buffer), "%a %b %d %H:%M:%S %Y", std::localtime(&now_c));
+        FieldValueTuple tuple("last_up_time", buffer);
         tuples.push_back(tuple);
     }
     m_portTable->set(port.m_alias, tuples);