chore(updatecli): change date detection for expiry and new certificat…

…e lifespan (#573)

as per
jenkins-infra/helpdesk#3875 (comment)

updatecli/scripts/date_next_expiry.sh

@@ -12,4 +12,4 @@ fi
 command -v "${DATE_BIN}" >/dev/null 2>&1 || { echo "ERROR: ${DATE_BIN} command not found. Exiting."; exit 1; }
 
 # "${DATE_BIN}" --utc +"%Y-%m-%dT00:00:00Z" -d '+1 month' #keep for later use with allinone not alpine based
-"${DATE_BIN}" -d@"$(( $(date +%s)+60*60*24*31))" --utc '+%Y-%m-%dT00:00:00Z'
+"${DATE_BIN}" -d@"$(( $(date +%s)+60*60*24*30*3))" --utc '+%Y-%m-%dT00:00:00Z' # next expiry in around 3 month

updatecli/scripts/datediff_expiry.sh

@@ -15,9 +15,9 @@ command -v "${DATE_BIN}" >/dev/null 2>&1 || { echo "ERROR: ${DATE_BIN} command n
 
 currentdateepoch=$("${DATE_BIN}" --utc "+%s" 2>/dev/null)
 expirydateepoch=$("${DATE_BIN}" "+%s" -d "$currentexpirydate" -D"%Y-%m-%dT00:00:00Z")
-datediff=$(((expirydateepoch-currentdateepoch)/86400))
+datediff=$(((expirydateepoch-currentdateepoch)/(60*60*24))) # diff per days
 
-if [ "$datediff" -lt 10 ]
+if [ "$datediff" -lt 10 ] # launch renew 10 days before expiration
 then
     echo "time for update"
     exit 0