diff -U 4 src-orig/detect-engine-analyzer.c src-new/detect-engine-analyzer.c
--- src-orig/detect-engine-analyzer.c	2016-01-22 16:57:14.000000000 +0100
+++ src-new/detect-engine-analyzer.c	2016-02-22 09:05:51.000000000 +0100
@@ -245,11 +245,11 @@
     struct tm local_tm;
     tms = SCLocalTime(tval.tv_sec, &local_tm);
     fprintf(fp_engine_analysis_FD, "----------------------------------------------"
             "---------------------\n");
-    fprintf(fp_engine_analysis_FD, "Date: %" PRId32 "/%" PRId32 "/%04d -- "
+    fprintf(fp_engine_analysis_FD, "Date: %04d-%02d-%02d -- "  // ISO format time stamp
             "%02d:%02d:%02d\n",
-            tms->tm_mday, tms->tm_mon + 1, tms->tm_year + 1900, tms->tm_hour,
+            tms->tm_year + 1900, tms->tm_mon + 1, tms->tm_mday, tms->tm_hour, // ISO format time stamp
             tms->tm_min, tms->tm_sec);
     fprintf(fp_engine_analysis_FD, "----------------------------------------------"
             "---------------------\n");
 
@@ -293,11 +293,11 @@
             struct tm local_tm;
             tms = SCLocalTime(tval.tv_sec, &local_tm);
             fprintf(rule_engine_analysis_FD, "----------------------------------------------"
                     "---------------------\n");
-            fprintf(rule_engine_analysis_FD, "Date: %" PRId32 "/%" PRId32 "/%04d -- "
+            fprintf(rule_engine_analysis_FD, "Date: %04d-%02d-%02d -- "  // ISO format time stamp
                     "%02d:%02d:%02d\n",
-                    tms->tm_mday, tms->tm_mon + 1, tms->tm_year + 1900, tms->tm_hour,
+                    tms->tm_year + 1900, tms->tm_mon + 1, tms->tm_mday, tms->tm_hour,  // ISO format time stamp
                     tms->tm_min, tms->tm_sec);
             fprintf(rule_engine_analysis_FD, "----------------------------------------------"
                     "---------------------\n");
 
diff -U 4 src-orig/log-stats.c src-new/log-stats.c
--- src-orig/log-stats.c	2016-01-22 16:57:14.000000000 +0100
+++ src-new/log-stats.c	2016-02-22 09:06:54.000000000 +0100
@@ -90,11 +90,11 @@
     int days = in_hours / 24;
 
     MemBufferWriteString(aft->buffer, "----------------------------------------------"
             "---------------------\n");
-    MemBufferWriteString(aft->buffer, "Date: %" PRId32 "/%" PRId32 "/%04d -- "
+    MemBufferWriteString(aft->buffer, "Date: %04d-%02d-%02d -- "        // ISO format time stamp
             "%02d:%02d:%02d (uptime: %"PRId32"d, %02dh %02dm %02ds)\n",
-            tms->tm_mon + 1, tms->tm_mday, tms->tm_year + 1900, tms->tm_hour,
+            tms->tm_year + 1900, tms->tm_mon + 1, tms->tm_mday,  tms->tm_hour,        // ISO format time stamp
             tms->tm_min, tms->tm_sec, days, hours, min, sec);
     MemBufferWriteString(aft->buffer, "----------------------------------------------"
             "---------------------\n");
     MemBufferWriteString(aft->buffer, "%-25s | %-25s | %-s\n", "Counter", "TM Name",
diff -U 4 src-orig/util-debug.c src-new/util-debug.c
--- src-orig/util-debug.c	2016-01-22 16:57:14.000000000 +0100
+++ src-new/util-debug.c	2016-02-22 09:18:18.000000000 +0100
@@ -328,11 +328,11 @@
                 struct tm local_tm;
                 tms = SCLocalTime(tval->tv_sec, &local_tm);
 
                 cw = snprintf(temp, SC_LOG_MAX_LOG_MSG_LEN - (temp - buffer),
-                              "%s%s%d/%d/%04d -- %02d:%02d:%02d%s",
-                              substr, green, tms->tm_mday, tms->tm_mon + 1,
-                              tms->tm_year + 1900, tms->tm_hour, tms->tm_min,
+                              "%s%s%04d-%02d-%02d -- %02d:%02d:%02d%s",                  // ISO format time stamp
+                              substr, green, tms->tm_year + 1900,  tms->tm_mon + 1,  // ISO format time stamp
+                              tms->tm_mday, tms->tm_hour, tms->tm_min,               // ISO format time stamp
                               tms->tm_sec, reset);
                 if (cw < 0)
                     goto error;
                 temp += cw;
diff -U 4 src-orig/util-profiling-keywords.c src-new/util-profiling-keywords.c
--- src-orig/util-profiling-keywords.c	2016-01-22 16:57:14.000000000 +0100
+++ src-new/util-profiling-keywords.c	2016-02-22 09:07:52.000000000 +0100
@@ -182,10 +182,10 @@
 
     fprintf(fp, "  ----------------------------------------------"
             "------------------------------------------------------"
             "----------------------------\n");
-    fprintf(fp, "  Date: %" PRId32 "/%" PRId32 "/%04d -- "
-            "%02d:%02d:%02d\n", tms->tm_mon + 1, tms->tm_mday, tms->tm_year + 1900,
+    fprintf(fp, "  Date: %04d-%02d-%02d -- "               // ISO format time stamp
+            "%02d:%02d:%02d\n", tms->tm_year + 1900, tms->tm_mon + 1, tms->tm_mday,  // ISO format time stamp
             tms->tm_hour,tms->tm_min, tms->tm_sec);
 
     /* global stats first */
     DoDump(de_ctx->profile_keyword_ctx, fp, "total");
diff -U 4 src-orig/util-profiling-rules.c src-new/util-profiling-rules.c
--- src-orig/util-profiling-rules.c	2016-01-22 16:57:14.000000000 +0100
+++ src-new/util-profiling-rules.c	2016-02-22 09:07:26.000000000 +0100
@@ -367,10 +367,10 @@
     tms = SCLocalTime(tval.tv_sec, &local_tm);
 
     fprintf(fp, "  ----------------------------------------------"
             "----------------------------\n");
-    fprintf(fp, "  Date: %" PRId32 "/%" PRId32 "/%04d -- "
-            "%02d:%02d:%02d\n", tms->tm_mon + 1, tms->tm_mday, tms->tm_year + 1900,
+    fprintf(fp, "  Date: %04d-%02d-%02d -- "            // ISO format time stamp
+            "%02d:%02d:%02d\n", tms->tm_year + 1900, tms->tm_mon + 1, tms->tm_mday,  // ISO format time stamp
             tms->tm_hour,tms->tm_min, tms->tm_sec);
     fprintf(fp, "  ----------------------------------------------"
             "----------------------------\n");
     fprintf(fp, "   %-8s %-12s %-8s %-8s %-12s %-6s %-8s %-8s %-11s %-11s %-11s %-11s\n", "Num", "Rule", "Gid", "Rev", "Ticks", "%", "Checks", "Matches", "Max Ticks", "Avg Ticks", "Avg Match", "Avg No Match");
diff -U 4 src-orig/util-time.c src-new/util-time.c
--- src-orig/util-time.c	2016-01-22 16:57:14.000000000 +0100
+++ src-new/util-time.c	2016-02-22 09:21:53.000000000 +0100
@@ -156,10 +156,10 @@
     struct tm local_tm;
     struct tm *t = (struct tm*)SCLocalTime(time, &local_tm);
 
     if (likely(t != NULL)) {
-        snprintf(str, size, "%02d/%02d/%02d-%02d:%02d:%02d.%06u",
-                t->tm_mon + 1, t->tm_mday, t->tm_year + 1900, t->tm_hour,
+        snprintf(str, size, "%04d-%02d-%02dT%02d:%02d:%02d.%06u",          // ISO format time stamp
+                t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, t->tm_hour,  // ISO format time stamp
                 t->tm_min, t->tm_sec, (uint32_t) ts->tv_usec);
     } else {
         snprintf(str, size, "ts-error");
     }
@@ -247,10 +247,10 @@
 {
     struct tm local_tm;
     struct tm *t = (struct tm *)SCLocalTime(time, &local_tm);
     int cached_len = snprintf(cached_local_time[n], MAX_LOCAL_TIME_STRING,
-                              "%02d/%02d/%02d-%02d:%02d:",
-                              t->tm_mon + 1, t->tm_mday, t->tm_year + 1900,
+                              "%04d-%02d-%02dT%02d:%02d:",              // ISO format time stamp
+                              t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,   // ISO format time stamp
                               t->tm_hour, t->tm_min);
     cached_local_time_len[n] = cached_len;
     /* Store the time of the beginning of the minute. */
     last_local_time[n] = time - t->tm_sec;