diff --git a/bin/migrateto20.php b/bin/migrateto20.php
index fb24fe599d..195e3749c6 100755
--- a/bin/migrateto20.php
+++ b/bin/migrateto20.php
@@ -256,7 +256,7 @@
     striptodos TINYINT(1) NULL,
     stripalarms TINYINT(1) NULL,
     stripattachments TINYINT(1) NULL,
-    lastmodified INT(11) UNSIGNED,
+    lastmodified BIGINT(11) UNSIGNED,
     UNIQUE(principaluri, uri)
 );
             ");
@@ -360,7 +360,7 @@
     addressbookid INT(11) UNSIGNED NOT NULL,
     carddata MEDIUMBLOB,
     uri VARCHAR(200),
-    lastmodified INT(11) UNSIGNED,
+    lastmodified BIGINT(11) UNSIGNED,
     etag VARBINARY(32),
     size INT(11) UNSIGNED NOT NULL
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
diff --git a/bin/migrateto21.php b/bin/migrateto21.php
index 2c15b0a217..9ba81d0d9d 100755
--- a/bin/migrateto21.php
+++ b/bin/migrateto21.php
@@ -140,7 +140,7 @@
     principaluri VARCHAR(255),
     calendardata MEDIUMBLOB,
     uri VARCHAR(200),
-    lastmodified INT(11) UNSIGNED,
+    lastmodified BIGINT(11) UNSIGNED,
     etag VARCHAR(32),
     size INT(11) UNSIGNED NOT NULL
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
diff --git a/examples/addressbookserver.php b/examples/addressbookserver.php
index 48f1e91702..cf77b625a0 100644
--- a/examples/addressbookserver.php
+++ b/examples/addressbookserver.php
@@ -1,11 +1,8 @@
 <?php
 
 /*
-
 Addressbook/CardDAV server example
-
 This server features CardDAV support
-
 */
 
 // settings
@@ -13,10 +10,11 @@
 
 // Make sure this setting is turned on and reflect the root url for your WebDAV server.
 // This can be for example the root / or a complete path to your server script
-$baseUri = '/';
+$baseUri = '/dav/addressbookserver.php';
 
 /* Database */
-$pdo = new PDO('sqlite:data/db.sqlite');
+//$pdo = new PDO('sqlite:data/db.sqlite');
+$pdo = new PDO('mysql:dbname=sabredav;host=127.0.0.1', 'username', 'password');
 $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
 
 // Autoloader
@@ -27,6 +25,7 @@
 $principalBackend = new Sabre\DAVACL\PrincipalBackend\PDO($pdo);
 $carddavBackend = new Sabre\CardDAV\Backend\PDO($pdo);
 //$caldavBackend    = new Sabre\CalDAV\Backend\PDO($pdo);
+$authBackend->setRealm('SabreDAV');
 
 // Setting up the directory tree //
 $nodes = [
@@ -48,4 +47,4 @@
 $server->addPlugin(new Sabre\DAV\Sync\Plugin());
 
 // And off we go!
-$server->start();
+$server->exec();
diff --git a/examples/calendarserver.php b/examples/calendarserver.php
index 88ea961145..ac79cbe31b 100644
--- a/examples/calendarserver.php
+++ b/examples/calendarserver.php
@@ -1,11 +1,8 @@
 <?php
 
 /*
-
 CalendarServer example
-
 This server features CalDAV support
-
 */
 
 // settings
@@ -13,10 +10,11 @@
 
 // If you want to run the SabreDAV server in a custom location (using mod_rewrite for instance)
 // You can override the baseUri here.
-// $baseUri = '/';
+$baseUri = '/dav/calendarserver.php';
 
 /* Database */
-$pdo = new PDO('sqlite:data/db.sqlite');
+//$pdo = new PDO('sqlite:data/db.sqlite');
+$pdo = new PDO('mysql:dbname=sabredav;host=127.0.0.1', 'username', 'password');
 $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
 
 // Files we need
@@ -26,6 +24,7 @@
 $authBackend = new Sabre\DAV\Auth\Backend\PDO($pdo);
 $calendarBackend = new Sabre\CalDAV\Backend\PDO($pdo);
 $principalBackend = new Sabre\DAVACL\PrincipalBackend\PDO($pdo);
+$authBackend->setRealm('SabreDAV');
 
 // Directory structure
 $tree = [
@@ -72,4 +71,4 @@
 $server->addPlugin($browser);
 
 // And off we go!
-$server->start();
+$server->exec();
diff --git a/examples/sql/mysql.addressbooks.sql b/examples/sql/mysql.addressbooks.sql
index 9ec88babec..f1df4da164 100644
--- a/examples/sql/mysql.addressbooks.sql
+++ b/examples/sql/mysql.addressbooks.sql
@@ -13,7 +13,7 @@ CREATE TABLE cards (
     addressbookid INT(11) UNSIGNED NOT NULL,
     carddata MEDIUMBLOB,
     uri VARBINARY(200),
-    lastmodified INT(11) UNSIGNED,
+    lastmodified BIGINT(11) UNSIGNED,
     etag VARBINARY(32),
     size INT(11) UNSIGNED NOT NULL
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
diff --git a/examples/sql/mysql.calendars.sql b/examples/sql/mysql.calendars.sql
index 21c5bcb443..d89a350229 100644
--- a/examples/sql/mysql.calendars.sql
+++ b/examples/sql/mysql.calendars.sql
@@ -3,12 +3,12 @@ CREATE TABLE calendarobjects (
     calendardata MEDIUMBLOB,
     uri VARBINARY(200),
     calendarid INTEGER UNSIGNED NOT NULL,
-    lastmodified INT(11) UNSIGNED,
+    lastmodified BIGINT(11) UNSIGNED,
     etag VARBINARY(32),
     size INT(11) UNSIGNED NOT NULL,
     componenttype VARBINARY(8),
-    firstoccurence INT(11) UNSIGNED,
-    lastoccurence INT(11) UNSIGNED,
+    firstoccurence BIGINT(11) UNSIGNED,
+    lastoccurence BIGINT(11) UNSIGNED,
     uid VARBINARY(200),
     UNIQUE(calendarid, uri),
     INDEX calendarid_time (calendarid, firstoccurence)
@@ -61,7 +61,7 @@ CREATE TABLE calendarsubscriptions (
     striptodos TINYINT(1) NULL,
     stripalarms TINYINT(1) NULL,
     stripattachments TINYINT(1) NULL,
-    lastmodified INT(11) UNSIGNED,
+    lastmodified BIGINT(11) UNSIGNED,
     UNIQUE(principaluri, uri)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
@@ -70,7 +70,7 @@ CREATE TABLE schedulingobjects (
     principaluri VARBINARY(255),
     calendardata MEDIUMBLOB,
     uri VARBINARY(200),
-    lastmodified INT(11) UNSIGNED,
+    lastmodified BIGINT(11) UNSIGNED,
     etag VARBINARY(32),
     size INT(11) UNSIGNED NOT NULL
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
diff --git a/examples/sql/pgsql.addressbooks.sql b/examples/sql/pgsql.addressbooks.sql
index 98f414f42e..ffbcbc1827 100644
--- a/examples/sql/pgsql.addressbooks.sql
+++ b/examples/sql/pgsql.addressbooks.sql
@@ -18,7 +18,7 @@ CREATE TABLE cards (
     addressbookid INTEGER NOT NULL,
     carddata BYTEA,
     uri VARCHAR(200),
-    lastmodified INTEGER,
+    lastmodified BIGINT,
     etag VARCHAR(32),
     size INTEGER NOT NULL
 );
diff --git a/examples/sql/pgsql.calendars.sql b/examples/sql/pgsql.calendars.sql
index caaaa888d2..a84605b2b8 100644
--- a/examples/sql/pgsql.calendars.sql
+++ b/examples/sql/pgsql.calendars.sql
@@ -3,12 +3,12 @@ CREATE TABLE calendarobjects (
     calendardata BYTEA,
     uri VARCHAR(200),
     calendarid INTEGER NOT NULL,
-    lastmodified INTEGER,
+    lastmodified BIGINT,
     etag VARCHAR(32),
     size INTEGER NOT NULL,
     componenttype VARCHAR(8),
-    firstoccurence INTEGER,
-    lastoccurence INTEGER,
+    firstoccurence BIGINT,
+    lastoccurence BIGINT,
     uid VARCHAR(200)
 );
 
@@ -71,7 +71,7 @@ CREATE TABLE calendarsubscriptions (
     striptodos SMALLINT NULL,
     stripalarms SMALLINT NULL,
     stripattachments SMALLINT NULL,
-    lastmodified INTEGER
+    lastmodified BIGINT
 );
 
 ALTER TABLE ONLY calendarsubscriptions
@@ -99,7 +99,7 @@ CREATE TABLE schedulingobjects (
     principaluri VARCHAR(255),
     calendardata BYTEA,
     uri VARCHAR(200),
-    lastmodified INTEGER,
+    lastmodified BIGINT,
     etag VARCHAR(32),
     size INTEGER NOT NULL
 );
diff --git a/lib/CalDAV/Backend/PDO.php b/lib/CalDAV/Backend/PDO.php
index 2767896434..0c3d8ab4be 100644
--- a/lib/CalDAV/Backend/PDO.php
+++ b/lib/CalDAV/Backend/PDO.php
@@ -31,7 +31,8 @@ class PDO extends AbstractBackend implements SyncSupport, SubscriptionSupport, S
      * in 2038-01-19 to avoid problems when the date is converted
      * to a unix timestamp.
      */
-    const MAX_DATE = '2038-01-01';
+	//2026-MAR-22 buckaroo-labs increase maximum date on 64-bit system (see MAX_DATE usage below).
+	const MAX_DATE = '2038-01-01';
 
     /**
      * pdo.
@@ -662,7 +663,11 @@ protected function getDenormalizedData($calendarData)
                 }
             } else {
                 $it = new VObject\Recur\EventIterator($vObject, (string) $component->UID);
-                $maxDate = new \DateTime(self::MAX_DATE);
+
+				//2026-MAR-22 buckaroo-labs increase MAX_DATE on 64-bit system.
+				if (PHP_INT_SIZE<8) $maxDate = new \DateTime(self::MAX_DATE);
+				else $maxDate = new \DateTime('5000-01-01');
+
                 if ($it->isInfinite()) {
                     $lastOccurence = $maxDate->getTimeStamp();
                 } else {