Use UTC rather than local time in timestamp

Author: arista-nwolfe

orchagent/portsorch.cpp

@@ -3122,15 +3122,15 @@ void PortsOrch::updateDbPortFlapCount(Port& port, sai_port_oper_status_t pstatus
     {
         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));
+        std::strftime(buffer, sizeof(buffer), "%a %b %d %H:%M:%S %Y", std::gmtime(&now_c));
         FieldValueTuple tuple("last_down_time", buffer);
         tuples.push_back(tuple);
     } 
     else if (pstatus == SAI_PORT_OPER_STATUS_UP) 
     {
         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));
+        std::strftime(buffer, sizeof(buffer), "%a %b %d %H:%M:%S %Y", std::gmtime(&now_c));
         FieldValueTuple tuple("last_up_time", buffer);
         tuples.push_back(tuple);
     }