oiler

Update at once all of the Settings -> General -> Time Zone options of your WordPress network.
This plugin was written specifically for a network that has been around for many years and was set up before WordPress 2.8 fixed the daylight savings time issue. Back then, setting the local time for your blog depended on UTC offsets only, so daylight savings folks were off by an hour for half a year. Then WordPress introduced time zones by city and the problem was solved. But we had all our blogs still with the UTC offset in use. So rather than update them individually, this plugin was written to run once and then move on. Recommended use: upload to your mu-plugins folder, run it once and then delete.

Update Time Zones Across Network

Automatically change the time zone for all of the blogs on your multisite network. Not for single installations. WPMU / Multisite / Network only.

Konstantin Obenland

This plugin lets you as a network administrator add users to your sites without having to remember or look up the user’s login name. It replaces the input field with a comfortable dropdown menu, so you can choose between all existing users that are not yet added to the site.
Don’t worry about code overhead or performance issues, the plugin will only be loaded when a network admin screen is requested.

WPMU Network Site Users Dropdown

Replace the input field for adding existing users to a site with a more comfortable dropdown menu!

Update Time Zones Across Network vs WPMU Network Site Users Dropdown