Simple default timezone
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As Super Administrator, you can set the (default) timezone for all blogs.
This plugin provides network administrators ability to set same time zone over all blogs in multisite installation in one click, and also it restricts changes of timezone from local blogs settings.
*Based on: https://premium.wpmudev.org/forums/topic/set-default-timezone-for-new-blogs-in-the-network
Only works with multisite installation!
Gutenberg: compatible!
Disclaimers
The Simple default timezone plugin is supplied “as is” and all use is at your own risk.