Can you please tell me how to change the time format from 24 hour to 12 hour? Someone had done it for me, but the site had to be reformatted and I lost the changes. Please let me know step by step and what files to edit. Thank you!

April Pastis

Extension: One page checkout for Virtuemart v. 5.20
Joomla: 3.6.4
Virtuemart v. 3.0.18