Date Format Customization

[lucid-dreem]

Description

Added a Date Format field to allow for customization based on 4 options. Tried to use the text box alternative but it seemed like it would be a better option to use the dropdown and have a text box as one of the Advanced Options if required. No changes have been made to the Advanced Options in this pull request.

Fixes #134

Type of change

• New feature (added a non-breaking change which adds functionality)

How Has This Been Tested?

• Tested locally with a valid username
• Tested locally with an invalid username
• Ran tests with composer test
• Added or updated test cases to test new features

Checklist:

• I have checked to make sure no other pull requests are open for this issue
• The code is properly formatted and is consistent with the existing code style
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

Screenshots

[DenverCoder1]

Looks good, maybe make the option text show examples of the date format instead of the format string to make it easier to use:

eg.

<option value="M j[, Y]">Apr 14 / Apr 14, 2021</option>

Also, the options don't have to be the examples in the readme, maybe pick a few common formats like one with month day year, one day month year, one year month day, maybe one with dots, one with slashes, etc.