Custom field Date/Time: This comes with a calendar "picker" but you can type in the date and time instead if you use the correct format. We recently switched from 12- to 24-hour format. Here's the problem: If, for example, you type in 9:00 PM for the time, it comes up as 09:00 when instead it should come up as 21:00 (after clicking Save). Basically, instead of signaling an error, the "PM" is simply ignored. JIRA should either process the PM correctly or signal an error and force the user to enter the data again. (Note that specifying AM is not a problem as ignoring it doesn't change the time.)