Board Thread:Support Requests - Getting Technical/@comment-6100947-20160825072404/@comment-1757994-20160902033001

You do really need the s to keep MediaWiki from messing with the configuration.

First Sunday is  (Sunday with date 1 to 7). Second Sunday is  (Sunday with date 8 to 14).

(Sunday with date 6 to 12) and  (Sunday with date 13 to 19), while valid syntax, won't get you what you need.

California's standard time is PST, although it doesn't matter that much. The timezones from the rules override the zone definition.