You'll need to know this if you're sending a letter or parcel to a loved one this Christmas.
An Post has advised customers to "post early" to make sure parcels and letters make it to their location on time.
"Millions of people all over the world are using post to send Christmas letters and parcels to loved ones," the postal service said.
"While these are the last dates of posting, this year is like no other and we advise customers to post early."
The latest posting dates to ensure delivery before Christmas:
An Post said customers using PostAim mailing need to ensure it's presented to the Mail Centre on December 4th, before 12 noon to make sure it lands before December 23rd.
The postal service also added that last posting dates are subject to change.
