The Timeout configuration parameter is now used for web.page.get, web.page.regexp and web.page.perf items.
In previous Zabbix versions, maintenance period calculation was unaware of the possible effects caused by Daylight Saving Time change resulting in unpredictable behaviours. In the new version Daylight Saving Time (DST) change is cared for and should not unpredictably affect how long the maintenance will be. Let's say we have a two-hour maintenance that usually starts at 1am and finishes at 3am. If after one hour of maintenance (at 2am) a DST change happens and current time changes from 2:00 to 3:00, the maintenance will continue for one more hour till 4:00.