Fix date bug in JS that makes dates not work with strings

What does this MR do?

Fix date bug in new Date('2017-07-01') when using strings as date.

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

To fix the Date bug in JS

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #29916 (closed)