Scriptrunner: Bulk Update Timezone Preferences for all Members of a Group

[Guru Darbar Khalsa]

Using Scriptrunner, I'm trying to bulk update the Timezone preferences for members in a group.

This works for individual users but, I can't seem to figure out how to apply it to all the members in a group.

Any help would be greatly appreciated.

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.user.preferences.PreferenceKeys


def userManager = ComponentAccessor.getUserManager()
def preferencesManager = ComponentAccessor.getUserPreferencesManager()

userManager.getUserByName('username').each { user ->
    preferencesManager.getExtendedPreferences(user).setString(PreferenceKeys.USER_TIMEZONE, 'America/Chicago')
}