====Problem
When blocking a user via Special:Block it would be helpful to have a calendar as datetime selector to select a specific day and hour in the future as expiry time. This avoids typing a (english) timestamp in the correct format inside the duration field, when not using the default block duration from the drop down list.
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====Acceptance criteria
* On Special:Block, add a buttonSelectWidget in front of the expiration dropdown.
** This element should be skipped in the tab ordering of the block page.
* The ~~first~~ second button option should be a pencil icon, which should be selected by default.
** When it is selected the expiration dropdown and text field should behave as they do today.
* The ~~second~~ first button option should be a calendar icon.
** On click it should replace the dropdown and text field with a DateTimeInputWidget widget allowing the user to provide a calendar date and time. (YYYY-MM-DD HH:MM:SS)
** The timezone should match the logged-in users' time zone preference. {T190603}
** On submit of the block, the system should calculate when block length between the current datetime and the selected datetime.
* Error messages
** The widget should not allow the user to select a date in the past (use an error message if needed)
** The widget should display a red border if the contents are invalid (if possible)
** If the system cannot compute a block length, on submit of the block the 'Expiry time invalid.' error message can display
* Temporary Config flag
* No change for no-JS users
* Toggling between the two options (pencil + calendar) should not result in any data loss. Whatever is selected when the user submits the block should be submitted.
* Should work on RTL and LTR wikis
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====Mockups
| **Note that in these mockups the order of the pencil and calendar icons are incorrect, and the calendar input is just a dateinput, when it will be a datetimeinput.** |
We'll want to add the DateTimeInputWidget which will be hidden behind a buttonSelectWidget, as seen on UploadWizard.
The default state would be the pencil, which would provide the same functionality as Special:Block has today:
{F13957098}
On click of the calendar icon, it would change the list dropdown to the DateTimeInputWidget, like such:
{F13957102}
The block would still be saved the same way, the calculation would happen before 'Block this user' is clicked.