fix: prevent invalid timestampinput #119 and inform User of error with appropriate message #109

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 22.76%. Comparing base (457781d) to head (b76a3a6). Report is 1 commits behind head on main.

Files	Patch %	Lines
frontend/src/app/(app)/working-hours/page.tsx	0.00%	12 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #121 +/- ## ============================================ - Coverage 22.79% 22.76% -0.04% Complexity 200 200 ============================================ Files 85 85 Lines 2167 2170 +3 Branches 341 344 +3 ============================================ Hits 494 494 - Misses 1538 1539 +1 - Partials 135 137 +2 ``` | [Flag](https://app.codecov.io/gh/ZHAW-PM4-Compass/compass/pull/121/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ZHAW-PM4-Compass) | Coverage Δ | | |---|---|---| | [backend](https://app.codecov.io/gh/ZHAW-PM4-Compass/compass/pull/121/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ZHAW-PM4-Compass) | `59.82% <ø> (ø)` | | | [frontend](https://app.codecov.io/gh/ZHAW-PM4-Compass/compass/pull/121/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ZHAW-PM4-Compass) | `0.73% <0.00%> (-0.01%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ZHAW-PM4-Compass#carryforward-flags-in-the-pull-request-comment) to find out more.

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