[FIX] Date parsing on Safari for the Public Holidays widget

[Lissy93]

Category: Bugfix

Overview
Safari being "special". Doesn't accept dates which don't include a time.
PR just adds a time (midnight) onto the dates returned by the API.

Issue Number #1532

New Vars N/A

Screenshot N/A

Code Quality Checklist (Please complete)

• All changes are backwards compatible
• All lint checks and tests are passing
• There are no (new) build warnings or errors
• (If a new config option is added) Attribute is outlined in the schema and documented
• (If a new dependency is added) Package is essential, and has been checked out for security or performance
• Bumps version, if new feature added

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