Add a helper function for processing a unix timestamp

rowbot

@@ -100,6 +100,32 @@ run_callbacks() {
   return "$status"
 }
 
+# The variables are checked dynamically
+# shellcheck disable=SC2034
+seconds() {
+  local day hour minute second span time
+  (( day = $1 / 60 / 60 / 24 ))
+  (( hour = $1 / 60 / 60 % 24 ))
+  (( minute = $1 / 60 % 60 ))
+  (( second = $1 % 60 ))
+
+  for span in day hour minute second; do
+    if (( ${!span} )); then
+      if [[ $time ]]; then
+        time+=", "
+      fi
+
+      time+="${!span} $span"
+
+      if (( ${!span} > 1 )); then
+        time+=s
+      fi
+    fi
+  done
+
+  printf -- %s "$time"
+}
+
 url() {
   if [[ ${config[tls]} = no ]]; then
     printf irc://