Hour bug in timestamp mixin

In the file Timestamp.php there is a bug in how the timestamp should be displayed. It says:
const DATE_FORMAT = 'Y-m-d h:i:s';

but shouldn't it be the following
const DATE_FORMAT = 'Y-m-d H:i:s';

Note the upper case H.
If you use lower case, then it's 12 hour format and you have to use AM/PM, but that's not appropriate for some non english languages (eg. Swedish). So please change to upper case H.

You're absolutely right, that should be a capital H, not a lowercase.

Great! Is there a chance this can be fixed in a future release of Omeka?

Yep! It's already in core, and so will be out in the next release. Don't have a good estimate on when that will be, though.