Update date and time when time change in OS

I’m a beginner. Before add a topic, i’ve searched in the documentation and forum without find a solution.
i’m working on Windows 7 with ignition version 8.0.9
I wrote {[System]Gateway/CurrentDateTime.value} in expression of label object , i also tried now().

But if i change the time in OS, the time display in label doesn’t update, the same for Timezone offset.
About UTC time, i wrote addHours(now(),-getTimezoneRawOffset()). tell me if it’s the good way
How to have a mirror of date time from OS to ignition, always updated (UTC, local time and timezoneoffset).
The goal is to display UTC and local time, and store some data in database(MariaDB) with UTC time.
Thank for your help