A string variable containing "AM" if the article was posted between 00:00 and 11:59 inclusive and "PM" if the article was posted between 12:00 and 23:59 inclusive.
Example
The following displays the "AM" or "PM" when the article was posted immediately after "Posted in the":
Posted in the {{publish_time.ampm}}.
For an article posted on Wednesday, February 18, 2004 at 19:23:26 Eastern Standard Time, the above would cause "PM" to be displayed.