As Mr. Chen states, most courts in Los Angeles County require motions in limine to be filed in a manner sufficient to be heard at the final status conference ("FSC"). This means that the parties must file and serve motions in limine 16 court days prior to the final status conference (plus additional 5 days if served by mail). Some courts may allow the parties to file such motions as late as the first day of trial. However, if the court has not explicitly specified a later due date, caution dictates that a motion in limine be filed in a manner sufficient to be heard at the FSC. Check California Rules of Court and the Local Court Rules.
Neither. Yes, there are specific local rules as well as courtroom rules. Most judges in Los Angeles expect to have the motions in limine noticed for hearing at the Final Status Conference.
In civil litigation in Los Angeles County, it is important not only to check the California Rules of Court and the Code of Civil Procedure, but also the local rules.
In Los Angeles Superior Court, there are local rules of the court which were recently revised and amended, effective July 1, 2011. See the link below:
In addition to those rules, you should check your own judge's Case Management Order, Final Status Conference Order, and other orders. The judge's orders should be in agreement with the State and County rules, but if not, you should follow your own judge's orders.