Format 'M jS Y, H:i:s' not properly working

[tyronx]

Everytime you select a date/time using this datetime format, and unfocus the drop down, the date/time changes into a different date

[oranges13]

This may be related to issues like #596 and #724 and #721, #722

In my case I was able to resolve by using a different date formatter (moment.js): https://github.com/xdan/datetimepicker/issues/596#issuecomment-724113347