Include current time in EMM information

srsepc/src/mme/nas.cc

@@ -26,6 +26,7 @@
 #include <cmath>
 #include <inttypes.h> // for printing uint64_t
 #include <sys/timerfd.h>
+#include <time.h>
 
 namespace srsepc {
 
@@ -1543,6 +1544,21 @@ bool nas::pack_emm_information(srslte::byte_buffer_t* nas_buffer)
   emm_info.utc_and_local_time_zone_present = false;
   emm_info.net_dst_present                 = false;
 
+  time_t    now;
+  struct tm broken_down_time;
+  if ((time(&now) != -1) && (gmtime_r(&now, &broken_down_time) != NULL)) {
+    emm_info.utc_and_local_time_zone.year    = broken_down_time.tm_year + 1900;
+    emm_info.utc_and_local_time_zone.month   = broken_down_time.tm_mon + 1;
+    emm_info.utc_and_local_time_zone.day     = broken_down_time.tm_mday;
+    emm_info.utc_and_local_time_zone.hour    = broken_down_time.tm_hour;
+    emm_info.utc_and_local_time_zone.minute  = broken_down_time.tm_min;
+    emm_info.utc_and_local_time_zone.second  = broken_down_time.tm_sec;
+    emm_info.utc_and_local_time_zone.tz      = 0;
+    emm_info.utc_and_local_time_zone_present = true;
+  } else {
+    m_nas_log->error("Error getting current time: %s\n", strerror(errno));
+  }
+
   uint8_t sec_hdr_type = LIBLTE_MME_SECURITY_HDR_TYPE_INTEGRITY_AND_CIPHERED;
   m_sec_ctx.dl_nas_count++;
   LIBLTE_ERROR_ENUM err = liblte_mme_pack_emm_information_msg(