Day.js add-ons

Day.js comes packaged with some plugins by default, described below:

`utc`

By default, dates handled by Day.js are not in UTC. The utc plugin is included, so you can call dayjs().utc() instead of dayjs().

`isSameOrBefore` and `isSameOrAfter`

It also includes the isSameOrBefore and isSameOrAfter for quick date comparison.

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