Add timezone compatibility to the Date/Time Picker calendar selector

Problem Definition

Users may wish to include Timezone functionality into their Date/Time picker custom fields. By default, this isn't possible, so the user may proceed to configure the following formats in JIRA's Administration >> System >> Advanced Settings:

• jira.date.time.picker.java.format
  • Add 'z' to the format
• jira.date.time.picker.javascript.format
  • Add '%Z' to the format

This does allow the timezone to be shown in issue view and in the issue navigator for example. However, when the changes above are done and the Calendar selector is used to specify the custom field's value, the calendar cannot add the timezone on it's own and the user must manually type in the timezone.

Suggested Solution

Change/Extend the calendar selector to be able to accommodate timezone selection.

Workaround

Manually type in the timezone for every entry; or, do not add timezones to the formats above.