diff --git a/src/manage_sql.c b/src/manage_sql.c
index 5fbcea45..1d247f23 100644
--- a/src/manage_sql.c
+++ b/src/manage_sql.c
@@ -888,23 +888,23 @@ parse_iso_time (const char *text_time)

   memset (&tm, 0, sizeof (struct tm));
   tm.tm_isdst = -1;
-  if (strptime ((char*) text_time, "%FT%T%z", &tm) == NULL)
+  if (strptime ((char*) text_time, "%Y-%m-%dT%T%z", &tm) == NULL)
     {
       gchar *tz;

       memset (&tm, 0, sizeof (struct tm));
       tm.tm_isdst = -1;
-      if (strptime ((char*) text_time, "%FT%TZ", &tm) == NULL)
+      if (strptime ((char*) text_time, "%Y-%m-%dT%TZ", &tm) == NULL)
         {
           /* Try time without timezone suffix, applying timezone of user. */

           memset (&tm, 0, sizeof (struct tm));
           tm.tm_isdst = -1;
-          if (strptime ((char*) text_time, "%FT%T", &tm) == NULL)
+          if (strptime ((char*) text_time, "%Y-%m-%dT%T", &tm) == NULL)
             {
               memset (&tm, 0, sizeof (struct tm));
               tm.tm_isdst = -1;
-              if (strptime ((char*) text_time, "%F %T", &tm) == NULL)
+              if (strptime ((char*) text_time, "%Y-%m-%d %T", &tm) == NULL)
                 return parse_ctime (text_time);
             }

@@ -928,11 +928,11 @@ parse_iso_time (const char *text_time)

           memset (&tm, 0, sizeof (struct tm));
           tm.tm_isdst = -1;
-          if (strptime ((char*) text_time, "%FT%T", &tm) == NULL)
+          if (strptime ((char*) text_time, "%Y-%m-%dT%T", &tm) == NULL)
             {
               memset (&tm, 0, sizeof (struct tm));
               tm.tm_isdst = -1;
-              if (strptime ((char*) text_time, "%F %T", &tm) == NULL)
+              if (strptime ((char*) text_time, "%Y-%m-%d %T", &tm) == NULL)
                 {
                   assert (0);
                   g_warning ("%s: Failed to parse time", __FUNCTION__);
@@ -961,7 +961,7 @@ parse_iso_time (const char *text_time)

           memset (&tm, 0, sizeof (struct tm));
           tm.tm_isdst = -1;
-          if (strptime ((char*) text_time, "%FT%TZ", &tm) == NULL)
+          if (strptime ((char*) text_time, "%Y-%m-%dT%TZ", &tm) == NULL)
             {
               assert (0);
               g_warning ("%s: Failed to parse time", __FUNCTION__);
@@ -1045,7 +1045,7 @@ parse_iso_time (const char *text_time)

       memset (&tm, 0, sizeof (struct tm));
       tm.tm_isdst = -1;
-      if (strptime ((char*) text_time, "%FT%T%z", &tm) == NULL)
+      if (strptime ((char*) text_time, "%Y-%m-%dT%T%z", &tm) == NULL)
         {
           assert (0);
           g_warning ("%s: Failed to parse time", __FUNCTION__);
@@ -28442,7 +28442,7 @@ host_summary_append (GString *host_summary_buffer, const char *host,
           struct tm start_tm;

           memset (&start_tm, 0, sizeof (struct tm));
-          if (strptime (start_iso, "%FT%H:%M:%S", &start_tm) == NULL)
+          if (strptime (start_iso, "%Y-%m-%dT%H:%M:%S", &start_tm) == NULL)
             {
               g_warning ("%s: Failed to parse start", __FUNCTION__);
               return;
@@ -28462,7 +28462,7 @@ host_summary_append (GString *host_summary_buffer, const char *host,
           struct tm end_tm;

           memset (&end_tm, 0, sizeof (struct tm));
-          if (strptime (end_iso, "%FT%H:%M:%S", &end_tm) == NULL)
+          if (strptime (end_iso, "%Y-%m-%dT%H:%M:%S", &end_tm) == NULL)
             {
               g_warning ("%s: Failed to parse end", __FUNCTION__);
               return;