Legal Question in Employment Law in California

No, they cannot do that and if you are an hourly employee, you should be paid no less than twice a month.

Only exempt employees can be paid less often than twice a month, and by definition an exempt employee's timesheets are not needed to calculate their pay, since they must be salaried. Furthermore, in the absence of a timesheet for an hourly employee, the employer must pay for the hours that the employer reasonably estimates the employee worked and make adjustments in a subsequent pay period when the actual hours are known.