Use MySQL date constructs instead of composing date strings in PHP and shoving them into queries

sections/schedule/daily/delete_dead_torrents.php

   FROM torrents AS t
     JOIN torrents_group AS tg ON tg.ID = t.GroupID
   WHERE
-    (t.last_action < '".time_minus(3600 * 24 * 28)."' AND t.last_action IS NOT NULL)
+    (t.last_action < (NOW() - INTERVAL 28 DAY) AND t.last_action IS NOT NULL)
     OR
-    (t.Time < '".time_minus(3600 * 24 * 2)."' AND t.last_action IS NULL)");
+    (t.Time < (NOW() - INTERVAL 2 DAY) AND t.last_action IS NULL)");
 $Torrents = $DB->to_array(false, MYSQLI_NUM, false);
 echo 'Found '.count($Torrents)." inactive torrents to be deleted.\n";
 

sections/schedule/daily/disable_inactive_users.php

       JOIN users_main AS um ON um.ID = ui.UserID
       LEFT JOIN users_levels AS ul ON ul.UserID = um.ID AND ul.PermissionID = '".CELEB."'
     WHERE um.PermissionID IN ('".USER."', '".MEMBER ."')
-      AND um.LastAccess < '".time_minus(3600 * 24 * 110, true)."'
-      AND um.LastAccess > '".time_minus(3600 * 24 * 111, true)."'
+      AND um.LastAccess < (NOW() - INTERVAL 110 DAY)
+      AND um.LastAccess > (NOW() - INTERVAL 111 DAY)
       AND um.LastAccess IS NOT NULL
       AND ui.Donor = '0'
       AND um.Enabled != '2'
       JOIN users_main AS um ON um.ID = ui.UserID
       LEFT JOIN users_levels AS ul ON ul.UserID = um.ID AND ul.PermissionID = '".CELEB."'
     WHERE um.PermissionID IN ('".USER."', '".MEMBER ."')
-      AND um.LastAccess < '".time_minus(3600 * 24 * 30 * 4)."'
+      AND um.LastAccess < (NOW() - INTERVAL 120 DAY)
       AND um.LastAccess IS NOT NULL
       AND ui.Donor = '0'
       AND um.Enabled != '2'

sections/schedule/daily/disable_unconfirmed_users.php

   FROM users_info AS ui
     JOIN users_main AS um ON um.ID = ui.UserID
   WHERE um.LastAccess IS NULL
-    AND ui.JoinDate < '".time_minus(60 * 60 * 24 * 7)."'
+    AND ui.JoinDate < (NOW() - INTERVAL 7 DAY)
     AND um.Enabled != '2'");
 $UserIDs = $DB->collect('UserID');
 
     ui.BanReason = '3',
     ui.AdminComment = CONCAT('$sqltime - Disabled for inactivity (never logged in)\n\n', ui.AdminComment)
   WHERE um.LastAccess IS NULL
-    AND ui.JoinDate < '".time_minus(60 * 60 * 24 * 7)."'
+    AND ui.JoinDate < (NOW() - INTERVAL 7 DAY)
     AND um.Enabled != '2'");
 $Cache->decrement('stats_user_count', $DB->affected_rows());