Generate last checked timestamp

.phpenv

@@ -16,4 +16,6 @@
 
 	// do not report warnings (timeouts, SSL/TLS errors)
 	error_reporting(E_ALL & ~E_WARNING);
+	
+	date_default_timezone_set('UTC');
 ?>

output/main.js

@@ -131,7 +131,7 @@ function setLastChecked(last_checked) {
 	const time_passed_in_minutes =
 		Math.floor(time_passed_in_seconds / 60); // time in minutes, rounded down
 	const timestamp_element = dom.last_checked();
-	timestamp_element.innerText =	`${time_passed_in_minutes} minutes`;
+	timestamp_element.innerText =	`${time_passed_in_minutes} minutes ago`;
 }
 
 /**

sites/index.php

@@ -42,7 +42,9 @@
 				<span id="servers_hidden">(None hidden as JS is off)</span>
 			</p>
 			<p id="last_checked">
-				Last checked <span id="last_checked_value"></span> ago.
+				Last checked <span id="last_checked_value">
+					<?=date("Y-m-d H:i:s", $timestamp)?> (UTC)
+				</span>.
 			</p>
 			<p id="disclaimer">
 					This site is not affiliated with