During my lab test using Zabbix 6.0 (same for 6.2) and a Proxy with a time drifting problem (1 hour ahead) I discovered some potential not so nice behaviour like:

• from Admin->Proxies - You can not see nothing all is “green”
• If I install an agent on the proxy machine and I create a “system.localtime” (Passive Item) with Fuzzy trigger we did not see nothing because the Item will never be populated (without any kind of error)
• Testing an Item on a Host linked to the Proxy is not working with this strange message: “The task has been expired.“

At the moment there is no "clean" way to solve this kind of scenario.

I would like to suggest an internal check for this kind of scenario, because if the clock is very important for Zabbix it must be verify directly from Zabbix and not using an external check.