It seems that after upgradering sites to Joomla 3.7.0, the calendar field in PUBLISHING tab is broken. There is missing a seperator between month and year. After clicking in calendar field again, the year is converted to year 2100 and it impossible to modify the content.

For a clean install of Joomla 3.7, this works fine.

Steps to reproduce the issue

1. Create new article
2. Go to PUBLISHING tab
3. choose date from START PUBLISHING.
4. Click outside the calendar field and try again.

Expected result

The new selected date should appear

Actual result

See video/GIF here: https://www.dropbox.com/s/vbd3qea54zveu1a/Joomla3.7bug.gif?dl=0

System information (as much as possible)

php: Linux 102a 4.4.0-59-generic #80-Ubuntu SMP Fri Jan 6 17:47:47 UTC 2017 x86_64
dbversion: 5.7.17-0ubuntu0.16.04.1-log
dbcollation: latin1_swedish_ci
dbconnectioncollation: utf8mb4_general_ci
phpversion: 7.1.3-3+deb.sury.org~xenial+1
server: Apache/2.4.18 (Ubuntu)
sapi_name: apache2handler
version: Joomla! 3.7.0 Stable [ Amani ] 25-April-2017 15:36 GMT
platform: Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT
useragent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:53.0) Gecko/20100101 Firefox/53.0

Additional comments

This is critical of publishers who want to change the start and stop date in articles.