[Issue #2736] refactor dateUtils to use dayJS

[karinamzalez]

Summary

Fixes #2736

Time to review: 5 mins

Changes proposed

What was added, updated, or removed in this PR.

• updates dateUtils > formatDate to utilize dayJS
• Specifies node version in README instructions.

Context for reviewers

Testing instructions, background context, more in-depth details of the implementation, and anything else you'd like to call out or ask reviewers. Explain how the changes were verified.

• dayJS is now utilized to validate and format dates

Additional information

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[karinamzalez]

QUESTION: I kept the dateUtils formatDate function / refactored it instead of removing it completely to keep some uniform date string validation prior to formatting. The original ticket does state that I should deprecate this function entirely, should I disregard the potential need for date string validation and fully deprecate this dateUtils function?

[mdragon]

should I disregard the potential need for date string validation and fully deprecate this dateUtils function?

Thanks for working on this, @karinamzalez! I think you're identifying value in this function remaining, that likely just hadn't been thought of when we created the ticket, so I think we can tweak the ticket to adapt to your suggestion.

[acouch]

Looks great, thanks.