diff --git a/gancioff b/gancioff
index a727260..3c4f3f7 100755
--- a/gancioff
+++ b/gancioff
@@ -18,7 +18,7 @@
 
 $SNAME='GancioFF';
 $ENAME=strtolower($SNAME);
-$SVERS='0.4.2';
+$SVERS='0.4.3';
 
 require __DIR__.'/lib/gettlds.php';
 require __DIR__.'/lib/mastodon-postLength.php';
@@ -87,6 +87,12 @@ fedi_token = w6oQ_Ot2LSAm_Q31hrvp0asfl22ip3O4ipYq1kV1ceY
 # For example:
 state_file_absolute_path = /var/local/cache/gancio.some.domain.feed.state
 
+# «timezone» is required to specify the timezone of the Gancio instance, in
+# order for {$SNAME} to calculate the correct datetimes. You can list the
+# supported timezones using option «-T» or «--timezones» (see the related
+# entry in the «OPTIONS» section. For example:
+timezone = Europe/Rome
+
 # «posts_language» is required to specify the ISO 639-1 code for the language
 # of posts (see https://www.loc.gov/standards/iso639-2/php/code_list.php for
 # a complete list). For example:
@@ -153,6 +159,8 @@ always_link_gancio_post = true
 -v / --verbose
   When this option is not set {$SNAME} prints only warning and error messages;
  when it is set it also prints informational messages about what it’s doing.
+-T / --timezones
+  List all the supported timezones.
 --
   Treat every possible subsequent argument as non-options. Useful only in the
  very improbable case your config file is named «--help» or as another option.
@@ -176,6 +184,7 @@ $conf=[
 	'fedi_hostname'=>['required'=>true, 'default'=>null],
 	'fedi_token'=>['required'=>true, 'default'=>null],
 	'state_file_absolute_path'=>['required'=>true, 'default'=>null],
+	'timezone'=>['required'=>true, 'default'=>null],
 	'posts_language'=>['required'=>true, 'default'=>null],
 	'posts_visibility'=>['required'=>false, 'default'=>'public'],
 	'max_post_length'=>['required'=>false, 'default'=>null],
@@ -189,6 +198,8 @@ $opts=[
 	'update-language-codes'=>false
 ];
 
+$timezones=timezone_identifiers_list();
+
 $canBeOpt=true;
 for ($i=1; $i<$argc; $i++) {
 	if ($canBeOpt && $argv[$i][0]=='-') {
@@ -211,6 +222,10 @@ for ($i=1; $i<$argc; $i++) {
 			$i++;
 		} elseif ($argv[$i]=='-v' || $argv[$i]=='--verbose') {
 			$opts['verbose']=true;
+		} elseif ($argv[$i]=='-T' || $argv[$i]=='--timezones') {
+			foreach ($timezones as $val)
+				echo "$val\n";
+			exit(0);
 		} elseif ($argv[$i]=='-u' || $argv[$i]=='--update-language-codes') {
 			$opts['update-language-codes']=true;
 		} elseif ($argv[$i]=='--make-readme') {
@@ -259,6 +274,7 @@ if (!is_file($confFP)) dieYoung("Error: «{$confFP}» is not a file.\n",1);
 if (!is_readable($confFP)) dieYoung("Error: «{$confFP}» is not readable.\n",1);
 getConf($conf,$confFP);
 if (preg_match('#^/.*$#',$conf['state_file_absolute_path'])!==1) dieYoung("Error: in configuration file: «state_file_absolute_path» must be an absolute path.\n",1);
+if (!in_array($conf['timezone'],$timezones)) dieYoung("Error: in configuration file: «timezone»: «{$conf['timezone']}» is not one of the supported timezones (use «-T» or «--timezones» to list them).\n",1);
 if (!in_array($conf['posts_language'],$langs)) dieYoung("Error: in configuration file: «posts_language»: «{$conf['posts_language']}» is not a known language code.\n",1);
 if (!in_array($conf['posts_visibility'],['public', 'unlisted', 'private', 'direct'])) dieYoung("Error: in configuration file: «posts_visibility» must be one of «public», «unlisted», «private» or «direct».\n",1);
 if (!is_null($conf['max_post_length'])) {
@@ -308,9 +324,9 @@ if (file_exists($conf['state_file_absolute_path'])) {
 	$i=0;
 	$buff=file($conf['state_file_absolute_path'],FILE_IGNORE_NEW_LINES);
 	foreach ($buff as $key=>$val) {
-		if (preg_match('#^(\d+)\t([a-z0-9]{64})\t(\S+)$#',$val,$matches)===1) {
+		if (preg_match('#^(\d+)\t(\d+)\t(\S+)$#',$val,$matches)===1) {
 			if ($matches[1]+0>=$graceLine)
-				$refs[$matches[3]]=['timestamp'=>$matches[1], 'hash'=>$matches[2]];
+				$refs[$matches[3]]=['postdate'=>$matches[1], 'pubdate'=>$matches[2]];
 			else
 				$i++;
 		} else {
@@ -320,7 +336,7 @@ if (file_exists($conf['state_file_absolute_path'])) {
 	unset($buff);
 	$fh=fopen($conf['state_file_absolute_path'],'w');
 	foreach ($refs as $key=>$val)
-		fwrite($fh,"{$val['timestamp']}\t{$val['hash']}\t{$key}\n");
+		fwrite($fh,"{$val['postdate']}\t{$val['pubdate']}\t{$key}\n");
 	fclose($fh);
 	vecho($opts['verbose'],'Info: got '.count($refs)." reference(s) to already posted announcement(s) from state file «{$conf['state_file_absolute_path']}»; removed {$i} reference(s) older than one year.\n");
 } elseif (is_null($opts['do-post']) && !$opts['test']) {
@@ -341,64 +357,78 @@ if ($feed===false) dieYoung("Error: got no valid XML from «{$conf['feed_url']}
 if (!isset($feed->channel->item) || !is_iterable($feed->channel->item) || !is_countable($feed->channel->item)) dieYoung("Error: feed from «{$conf['feed_url']}» had unexpected format.\n",1);
 $itemsCount=$feed->channel->item->count();
 if ($itemsCount==0) exitYoung("Info: feed from «{$conf['feed_url']}» was empty, bye.\n");
+//file_put_contents(__DIR__.'/storage/dump-'.time(),print_r($feed,true));
 
+date_default_timezone_set($conf['timezone']);
 $tsfp="{$conf['state_file_absolute_path']}.tmp";
 if (!$opts['test'] && ($fh=@fopen($tsfp,'w'))===false) dieYoung("Error: could not open «{$tsfp}» in «write» mode.\n",1);
 $itemsToPost=0;
 $goodPostsCount=0;
 $index=0;
+//2024-10-27T22:01:28+01:00
 foreach ($feed->channel->item as $item) {
 	$index++;
 	if (!isset($item->guid) || !isset($item->title) || !isset($item->link) || !isset($item->description) || !isset($item->pubDate)) {
 		fwrite(STDERR,"Warning: announcement #{$index} has unexpected format, skipping.\n");
 	} else {
+		//print_r($item);
+		$now=time();
 		$guid=$item->guid->__toString();
+		//$slug=preg_replace('#^.*/(.*)$#','$1',$guid);
+		$pubdate=strtotime($item->pubDate->__toString());
+		(preg_match('#^\[(\d{4,}-\d{2}-\d{2})\] #',$item->title,$matches)===1) ? $evdate=$matches[1] : $evdate=false;
 		$file=null;
 		$imgalt='';
-		$hash=$item->title.$item->pubDate;
 		if (isset($item->enclosure[0]['url']) && isset($item->enclosure[0]['type']) && isset($item->enclosure[0]['length'])) {
 			$file=['url'=>$item->enclosure[0]['url']->__toString(), 'type'=>$item->enclosure[0]['type']->__toString(), 'length'=>$item->enclosure[0]['length']->__toString()];
 			if (preg_match('#<img [^>]*alt="([^"]+)"#',$item->description->__toString(),$matches)===1) $imgalt=trim($matches[1]);
-			$hash.=$item->enclosure[0]['url'].$item->enclosure[0]['type'].$item->enclosure[0]['length'];
 		}
 		if ($imgalt=='') $imgalt='Flyer dell’evento';
 		//<h3>Raawwr Beats</h3><strong>Kassel - Werner-Hilpert-Straße 22</strong><br/><small>(samedi, 26 octobre 22:00)</small><br/><img alt="This is the alt-text" src="https://demo.gancio.org/media/fcb4ac7e55cb5a53a4008e7c49200dbd.jpg"/><p></p>
 		$buff=$item->description->__toString();
 		if ($buff=='') {
 			$ptext='';
-		} elseif (preg_match('#^\n?<h3>(.+)</h3><strong>(.+)</strong><br/><small>\((\w+)\W+(\d+)\W+(\w+)\W+(\d+:\d+)\)</small><br/>(.+)$#iuU',$buff,$matches)===1) {
+		} elseif (preg_match('#^\n?<h3>(.+)</h3><strong>(.+)</strong><br/><small>\((\w+)\W+(\d+)\W+(\w+)\W+(\d+:\d+)\)</small><br/>(.*)$#iuU',$buff,$matches)===1) {
 			//print_r($matches);
 			$matches[1]=hent($matches[1]);
 			$matches[2]=hent($matches[2]);
-			$ptext="{$matches[1]}\n\n".ucfirst($matches[3])." {$matches[4]} {$matches[5]} alle {$matches[6]} presso {$matches[2]}\n\n".html2text($matches[7]);
+			$ptext="{$matches[1]}\n\n".ucfirst($matches[3])." {$matches[4]} {$matches[5]} dalle {$matches[6]} presso {$matches[2]}\n\n".html2text($matches[7]);
+			if ($evdate!==false) $evdate.="T{$matches[6]}:00";
 		} else {
 			$ptext=html2text($item->description);
+			$evdate=false;
 		}
-		$hash.=$buff;
+		//echo "evdate: {$evdate}\n";
+		$evdate=strtotime($evdate);
+		//echo "{$now}: ".date('c',$now)." (now)\n{$pubdate}: ".date('c',$pubdate)." (pubdate: {$item->pubDate})\n{$evdate}: ".date('c',$evdate)." (evdate)\n";
+		//exitYoung("Ciao\n");
 		$plink="\n\n".$item->link->__toString();
-		$hash.=$item->link;
 		if (isset($item->category) && is_countable($item->category) && is_iterable($item->category) && $item->category->count()>0) {
 			$pcats=[];
-			foreach ($item->category as $val) {
+			foreach ($item->category as $val)
 				$pcats[]=hashtag($val->__toString());
-				$hash.=$val;
-			}
 			$pcats="\n\n".implode(' ',$pcats);
 		} else {
 			$pcats='';
 		}
-		$hash=hash('sha256',$hash);
 		if ($opts['test']) {
 			vecho($opts['verbose'],"Info: considering announcement «{$guid}» as new because we are in «test mode»; processing.\n");
 			$state='new';
+		} elseif ($evdate===false) {
+			fwrite(STDERR,"Warning: could not identify the event start datetime in announcement «{$guid}»; skipping.\n");
+			$state='error';
+		} elseif ($evdate<$now) {
+			vecho($opts['verbose'],"Info: announcement «{$guid}» has a start datetime of ".date('c',$evdate).", which is before now, ".date('c',$now)."; skipping.\n");
+			$state='error';
 		} elseif (array_key_exists($guid,$refs)) {
-			if ($hash==$refs[$guid]['hash']) {
+			if ($pubdate==$refs[$guid]['pubdate']) {
 				vecho($opts['verbose'],"Info: announcement «{$guid}» is not new and has not changed; skipping.\n");
 				$state='old';
 			} else {
 				vecho($opts['verbose'],"Info: announcement «{$guid}» is not new, but it has changed; processing.\n");
 				$state='changed';
 				$itemsToPost++;
+				$ptext="[MODIFICATO]\n\n{$ptext}";
 			}
 		} else {
 			vecho($opts['verbose'],"Info: announcement «{$guid}» is new; processing.\n");
@@ -500,17 +530,17 @@ foreach ($feed->channel->item as $item) {
 					} else {
 						vecho($opts['verbose'],"Info: successfully posted status for {$state} announcement «{$guid}» (URL: «{$res['content']['url']}»).\n");
 						//print_r($res['content']);
-						$refs[$guid]=['timestamp'=>time(), 'hash'=>$hash];
+						$refs[$guid]=['postdate'=>time(), 'pubdate'=>$pubdate];
 						$goodPostsCount++;
 					}
 				}
 			} else {
 				vecho($opts['verbose'],"Info: would have tried to post status for {$state} announcement «{$guid}».\n");
-				if ($state=='new' || $state=='changed') $refs[$guid]=['timestamp'=>time(), 'hash'=>$hash];
+				if ($state=='new' || $state=='changed') $refs[$guid]=['postdate'=>time(), 'pubdate'=>$pubdate];
 				$goodPostsCount++;
 			}
 		}
-		if (!$opts['test'] && array_key_exists($guid,$refs)) fwrite($fh,"{$refs[$guid]['timestamp']}\t{$refs[$guid]['hash']}\t{$guid}\n");
+		if (!$opts['test'] && array_key_exists($guid,$refs)) fwrite($fh,"{$refs[$guid]['postdate']}\t{$refs[$guid]['pubdate']}\t{$guid}\n");
 	}
 	if ($opts['test']) break;// to test a single post
 }