Fix utils TypeScript types

[DylanVann]

• Fixes the error:

  DateUtils only refers to a type but is being used as a value here TS2693

• I believe this would be a better fix than using namespaces as in Change interfaces to namespaces #896 due to reasons listed on this issue.

resolves #887 & resolves #865

[codecov-io]

Codecov Report

Merging #899 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #899   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          15     15           
  Lines         659    659           
  Branches      146    146           
=====================================
  Hits          659    659

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[LittleLampLight]

Bruh, merge this please!

[sanjanind]

@DylanVann Kindly merge this PR ASAP.

[gochi-dot]

Please merge it, guys 😰

[gpbl]

Sorry folks! Let's give some hope to this project again :)