The FLSA and the California Labor Code require that non-exempt employees must be paid for all hours actually worked. Therefore, an employee who works the 2 o'clock hour on Daylight Saving Time, and then again works the 2 o'clock hour on Standard Time has worked two hours and is entitled to payment for both. See, e.g., DOL Advisement on Daylight Savings [sic] Time.
To our surprise, there are some employers who believe that someone who worked from 10:00 p.m. on Saturday to 6:00 a.m. on Sunday is entitled to be paid for no more than 8 hours. Such an employee actually worked nine hours and is entitled to 8 hours of regular pay and 1 hour of overtime.
"They'll make it up in March when they get paid 8 hours of pay for 7 hours of work" is not a defense.