[typescript-migration] date_utils_test.test.ts

[mirus-ua]

---

name: Migrate date_utils_test.test.ts

Description

Linked issue: https://github.com/Hacker0x01/react-datepicker/issues/4700

Changes date_utils_test.test.ts was migrated to ts

Contribution checklist

• [x] I have followed the contributing guidelines.
• [x] I have added sufficient test coverage for my changes.
• [x] I have formatted my code with Prettier and checked for linting issues with ESLint for code readability.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.35%. Comparing base (0a1bed3) to head (a0e3646).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4785 +/- ## ======================================= Coverage 96.35% 96.35% ======================================= Files 8 8 Lines 959 959 Branches 442 435 -7 ======================================= Hits 924 924 Misses 35 35 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.