Here is everything you need to know about the post office, mail delivery, FedEx, UPS and Amazon on the holiday. Those who are hoping to stop at the post office that day will have to wait until Tuesday, Jan. 21, to visit. People who want to send out mail on MLK Day will also have to wait until Tuesday.

Universal's "Wolf Man" howls its way to No. 3, with "Sonic the Hedgehog 3" and "Den of Thieves 2: Pantera" close behind.

Despite a better than expected showing by "One of Them Days" (Sony), with $11.6 million in three days for the $14 million, Issa Rae-produced R-rated comedy, this was a pathetic box office for a weekend ahead of MLK Day.