Extra test - adding date -u -d

Adding this to at least partially prevent the virtually nonexistent possibility of timestamp and _utc_date() mismatch. If the normal date -u -d does not get converted (looking at you Solaris!), the poor man's method with manipulating the _utc_date() string output kicks in.

dnsapi/dns_websupport.sh

@@ -158,7 +158,7 @@ _ws_rest() {
   _debug2 api_secret "$WS_ApiSecret"
 
   timestamp=$(_time)
-  datez="$(_utc_date | sed "s/ /T/" | sed "s/$/+0000/")"
+  datez="$(date -u -d @"$timestamp" +%Y-%m-%dT%H:%M:%S%z 2>/dev/null/ || _utc_date | sed "s/ /T/" | sed "s/$/+0000/")"
   canonical_request="${me} ${pa} ${timestamp}"
   signature_hash=$(printf "%s" "$canonical_request" | _hmac sha1 "$(printf "%s" "$WS_ApiSecret" | _hex_dump | tr -d " ")" hex)
   basicauth="$(printf "%s:%s" "$WS_ApiKey" "$signature_hash" | _base64)"