If you are planning on shipping gifts for the holidays, you better do it soon. One United States Postal Service deadline is less than a week away. Items being mailed by USPS’s ground shipping option must be processed by this Thursday, December 14, 2017. The deadline for first class shipping is Tuesday, December 19, 2017. The postal office’s priority and priority express deadlines are December 20 and December 22, respectively, but it will cost you more.