The USPS has released the recommended dates to mail domestic items to ensure delivery by December 25th. I suggest subtracting 2 days from their recommendations.
First Class Mail - December 20th
Priority Mail - December 21st
Priority Express Mail - December 23rd
Parcel Post Standard Mail - December 14 (panic time!)
The Phillips Hall Post Office is open 8:30 to 4:30 but our mail is picked up at 3:30 Monday - Friday.
The Mail Center is open for shipping FedEx and UPS from 8:30 - 3:15 Monday - Friday.
The Phillips Hall Post Office carries Holiday Books of 20 stamps and has a limited supply of Hanukkah stamps.
https://www.ithaca.edu/intercom/article.php/20131212151824121