Comment 3 for bug 1712644

I've resolved this issue with the following branch:
http://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/klbeck/lp1712644-check-out-due-date

When trying to check out using a date in the past, the checkout input is disabled and an error will appear below the date-picker.