Updated some jinja2 string formatting, via stack exchange question Python: How do I format a date in Jinja2?
<h2>Notebook entry for {{this.pub_date.strftime('%b %d,%Y')}}</h2>
Here's a useful page for time date string formatting character sequences. Highlights:
%A
(The full name of the day of the week according to the current locale.)%d
(The day of the month as a decimal number (range 01 to 31).)%e
(Like %d, the day of the month as a decimal number, but a leading zero is replaced by a space.)%b
(The abbreviated month name according to the current locale.)%B
(The full month name according to the current locale.)%y
(The year as a decimal number without a century - range 00 to 99.)%Y
(The year as a decimal number including the century.)