diff --git a/www/admin/class_test.debug.php b/www/admin/class_test.debug.php
index 25427152..c50ba3ff 100644
--- a/www/admin/class_test.debug.php
+++ b/www/admin/class_test.debug.php
@@ -68,6 +68,14 @@ function test2(): array
 	return DebugSupport::getCallerMethodList(1);
 }
 
+// date stueff
+print "printTime(-1): " . DebugSupport::printTime() . "<br>";
+print "printTime(2): " . DebugSupport::printTime(2) . "<br>";
+print "printTime(3): " . DebugSupport::printTime(3) . "<br>";
+print "printTime(5): " . DebugSupport::printTime(5) . "<br>";
+print "printIsoTime(): " . DebugSupport::printIsoTime() . "<br>";
+print "printIsoTime(false): " . DebugSupport::printIsoTime(false) . "<br>";
+
 print "S::GETCALLERMETHOD: " . DebugSupport::getCallerMethod(0) . "<br>";
 print "S::GETCALLERMETHOD: " . test() . "<br>";
 print "S::GETCALLERMETHODLIST: <pre>" . print_r(test2(), true) . "</pre><br>";
@@ -146,7 +154,7 @@ print "LOG LEVEL: " .  DebugSupport::printAr(\CoreLibs\Convert\SetVarType::setAr
 	$new_log->getLogLevel('debug', 'on')
 )) . "<br>";
 
-echo "<b>CLASS DEBUG CALL</b><br>";
+echo "<b>CLASS DEBUG CALL LEGACY</b><br>";
 
 // @codingStandardsIgnoreLine
 class TestL
diff --git a/www/lib/CoreLibs/Debug/Support.php b/www/lib/CoreLibs/Debug/Support.php
index affec0f7..beabd0a8 100644
--- a/www/lib/CoreLibs/Debug/Support.php
+++ b/www/lib/CoreLibs/Debug/Support.php
@@ -33,6 +33,36 @@ class Support
 		return $string;
 	}
 
+	/**
+	 * print ISO type datetime with microseconds and timezone
+	 * Y-m-dTH:i:s.uP
+	 * if no micro time the ".u" part is omitted
+	 *
+	 * @param  bool   $set_micro_time
+	 * @return string
+	 */
+	public static function printIsoTime(bool $set_micro_time = true): string
+	{
+		$datetime = new \DateTime();
+
+		// Format the DateTime object to ISO 8601 with microseconds
+		// 'Y-m-d\TH:i:s.uP' is the format string:
+		// Y: Full year (e.g., 2025)
+		// m: Month (01-12)
+		// d: Day of the month (01-31)
+		// T: Literal 'T' to separate date and time (escaped with a backslash)
+		// H: Hour (00-23)
+		// i: Minute (00-59)
+		// s: Second (00-59)
+		// u: Microseconds (e.g., 654321)
+		// P: Difference to Greenwich time (GMT) with colon (e.g., +09:00)
+		if ($set_micro_time) {
+			return $datetime->format('Y-m-d\TH:i:s.uP');
+		} else {
+			return $datetime->format('Y-m-d\TH:i:sP');
+		}
+	}
+
 	/**
 	 * prints a html formatted (pre) data
 	 *
diff --git a/www/lib/CoreLibs/Logging/Logging.php b/www/lib/CoreLibs/Logging/Logging.php
index 334ed6ca..82719b02 100644
--- a/www/lib/CoreLibs/Logging/Logging.php
+++ b/www/lib/CoreLibs/Logging/Logging.php
@@ -96,6 +96,11 @@ class Logging
 			'type' => 'bool', 'mandatory' => false,
 			'default' => false, 'deprecated' => true, 'use' => 'log_per_date'
 		],
+		// if turned off uses old time format without time zone
+		'log_time_format_iso' => [
+			'type' => 'bool', 'mandatory' => false,
+			'default' => true
+		]
 	];
 
 	// options
@@ -646,7 +651,11 @@ class Logging
 		}
 		// print "CLASS: " . $class . "<br>";
 		// get timestamp
-		$timestamp = Support::printTime();
+		if (!empty($this->options['log_time_format_iso'])) {
+			$timestamp = Support::printIsoTime();
+		} else {
+			$timestamp = Support::printTime();
+		}
 
 		// if group id is empty replace it with current level
 		$group_str = $level->getName();