As shipping deadlines approach, the United States Postal Service is preparing for their busiest days of the year. The domestic standard shipping mail-by date is Monday. Monday is also the postal services busiest mailing day of the year for cards, letters and packages.

Those choosing to ship first-class or by priority mail have until Saturday, December 20th if they want their items to arrive before Christmas.

December 23rd is the last day to qualify for priority mail express.