Printing and Shipping must be done in the same day (within the post office business hour)?

[yowatta]

Printing and Shipping must be done in the same day (within the post office business hour)?  Can I print a label in advance and then ship next day?

[skeens]

Yes, I created my label on the 14th to be shipped on the 15th.  Then the 15th is a holiday, post office is closed. Now I have to create and pay again.

[surplusdealdude]

You can use a postage label up to 48 hours after you make it.

The Post Office doesn't like it, but the most they're going to do is wag their finger at you.