RangeError: Invalid time value

[jazbogross]

When I create a new post I get an error in the preview window with the following console output:

cms.be93d.js:120 RangeError: Invalid time value
at ne (cms.be93d.js:120:2229572)
at pe (cms.be93d.js:120:2233729)
at xa (cms.be93d.js:120:2121097)
at xl (cms.be93d.js:120:2177952)
at bc (cms.be93d.js:120:2167104)
at vc (cms.be93d.js:120:2167032)
at Oc (cms.be93d.js:120:2166895)
at ac (cms.be93d.js:120:2163702)
at oc (cms.be93d.js:120:2162254)
at k (cms.be93d.js:120:2195364)

Once I enter info into the frontmatter fields and save I get a working preview. There is no problem when editing existing posts. The error only happens at the first instance of creating a new post. I know that open authoring is in Beta, but this was happening before I changed to editorial workflow.

To Reproduce
I created this from the Hugo template. I have made content and layout changes but everything else remains the same and the problem was there before the changes I made so I would think the issue is there from the beginning when spinning up a site from the Hugo template.

Expected behavior
Preview of the changes made in frontmatter on a new post. No error message.

Screenshots

Applicable Versions:

• Static CMS version: @staticcms/[email protected]
• Git provider: github
• Browser version: Brave v 1.62.162

CMS configuration

backend:
  name: github
  repo: saragebran/oikos-archive
  open_authoring: true
publish_mode: editorial_workflow
media_folder: site/static/img
public_folder: /img
local_backend: true
collections:
 [... everything after this point is identical to the template...]

[KaneFreeman]

Please try updating to the most recent version v4.3.0 and let me know if you are still experiencing this issue. The datepicker library was updates significantly since v4.0.0.