GMT expiry display

Change solution to display GMT time in the local display format with
the offset number of hours from GMT to be clear about what timezone
this is if the local display format does not include offset.

1 files changed, 10 insertions, 1 deletions

diff --git a/plugins/sslutils.c b/plugins/sslutils.c
index 6437289..b412ef3 100644
--- a/plugins/sslutils.c
+++ b/plugins/sslutils.c
@@ -197,6 +197,7 @@ int np_net_ssl_check_cert(int days_till_exp_warn, int days_till_exp_crit){
         X509_NAME *subj=NULL;
         char timestamp[50] = "";
         char cn[MAX_CN_LENGTH]= "";
+        char *tz;
         
         int cnlen =-1;
         int status=STATE_UNKNOWN;
@@ -267,7 +268,15 @@ int np_net_ssl_check_cert(int days_till_exp_warn, int days_till_exp_crit){
         tm_t = timegm(&stamp);
         time_left = difftime(tm_t, time(NULL));
         days_left = time_left / 86400;
-        strftime(timestamp, 50, "%F %R %z/%Z", localtime(&tm_t));
+        tz = getenv("TZ");
+        setenv("TZ", "GMT", 1);
+        tzset();
+        strftime(timestamp, 50, "%c %z", localtime(&tm_t));
+        if (tz)
+                setenv("TZ", tz, 1);
+        else
+                unsetenv("TZ");
+        tzset();
 
         if (days_left > 0 && days_left <= days_till_exp_warn) {
                 printf (_("%s - Certificate '%s' expires in %d day(s) (%s).\n"), (days_left>days_till_exp_crit)?"WARNING":"CRITICAL", cn, days_left, timestamp);