Datetime Widget Displays current Datetime when field is empty

[Undistraction]

Describe the bug
I just tried to switch us over from the Date widget to the Datetime widget, however, it appears the Datetime widget will always display the current date/time, even if the field has no value.

This makes it look like the field has a value when it does not and is very confusing for users.

To Reproduce

1. Create a field with a widget type of 'datetime'.
2. Set a default value of '' or do not set a default value.

Expected behavior
The widget should behave the same as the Date widget, showing a blank field until the field is clicked into.

Applicable Versions:

• Netlify CMS version: 2.12.11
• Browser version Version 81.0.4044.129 (Official Build) (64-bit)

[erezrokah]

Hi @Undistraction, can you share a config file? I'm using:

backend:
  name: test-repo

media_folder: assets/uploads

collections: # A list of collections the CMS should be able to edit
  - name: 'posts' # Used in routes, ie.: /admin/collections/:slug/edit
    label: 'Posts' # Used in the UI
    label_singular: 'Post' # Used in the UI, ie: "New Post"
    folder: '_posts'
    create: true # Allow users to create new documents in this collection
    fields: # The fields each document in this collection have
      - { label: 'Title', name: 'title', widget: 'string', tagname: 'h1' }
      - {
          label: 'Publish Date',
          name: 'date',
          default: '',
          widget: 'datetime',
          dateFormat: 'YYYY-MM-DD',
          timeFormat: 'HH:mm',
          format: 'YYYY-MM-DD HH:mm',
        }

And getting:

[Undistraction]

@erezrokah Sorry. Had to roll-back to using the date widget. I'll find some time in the next week and put together a repro.

[aminimalanimal]

@erezrokah
You should be able to reproduce this by removing format from your configuration. When Netlify CMS’ default is used, it populates the field with the user’s current date.

[martinjagodic]

Done in #7261