%last_published%snippet. Although back in 2011 RealMac announced it was no longer supported, it still works. The date shown by this snippet will be localised, based on your system preferences for dates (mm/dd/yy or dd/mm/yy). Here’s an example of the output:
%last_published%snippet. I reused a script I found here for that. It worked really well, so I decided to turn it into a stack.