We did see that post and applied the fix. It did not help.
Please go to admin area > configuration > settings > customer settings. What are your "Time zone" settings?
(UTC-6:00) Central Time (US & Canada)
1. What about "Allow customers to select time zone"?
2. What timezone is your server located?
Customers are not allowed to change time zones, based on the customer settings.
All our servers are located in the Central time zone.
Last question. Have you tried version 3.90 or 4.00 (just to test it out)? Do you also experience the same issue with them?
i just tried in version 3.9 and Monday shows as the 1st of January instead of the 31st of December. thank you!