Historical question re L.A. stations during week of Pearl Harbor attack

[Ultimajock]

...curious what you historians around here might know. On the night of December 7, 1941, a complete blackout was declared in the states of Washington, Oregon and California. There's a recording of KIRO/710 Seattle announcing the blackout just before 7:00 Pacific Time, and then signing off the air. I have heard from a couple of sources that the blackouts continued well into that week. But the radio listings published in the Los Angeles Times ran all the way to Midnight on subsequent nights. Did the radio stations in Los Angeles also sign off at 7:00 that and subsequent evenings, or did they continue broadcasting into the night?...