fix: add padding on single digit dates in getDateString helper

[SimonLoir]

This fixes #15

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 84b7f8aa-4cb2-49eb-a155-28f62c71fb39

📥 Commits

Reviewing files that changed from the base of the PR and between 1ea26b7 and 18aba12.

📒 Files selected for processing (4)

• package.json
• src/helpers/getDateString.ts
• tests/builder-invoice.test.ts
• tests/get-date-string.test.ts

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📝 Walkthrough

Summary by CodeRabbit

• Bug Fixes

  • Standardized generated dates to the consistent YYYY-MM-DD format by zero-padding single-digit months and days.
  • Ensured equivalent date inputs produce identical invoice output.

• Tests

  • Added coverage for date formatting and invoice date consistency.

• Chores

  • Incremented the package version to 0.8.3.

Walkthrough

The date helper now returns zero-padded YYYY-MM-DD values. Tests cover string and Date inputs, and the package version increases to 0.8.3.

Changes

Invoice date formatting

Layer / File(s)	Summary
Zero-pad invoice dates src/helpers/getDateString.ts, tests/get-date-string.test.ts, tests/builder-invoice.test.ts	The helper pads single-digit months and days. Tests verify direct formatting and identical invoice XML for string and Date issue dates.
Release version update package.json	The package version changes from 0.8.2 to 0.8.3.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the date-padding fix in the getDateString helper.
Description check	✅ Passed	The description links directly to issue #15, which matches the date-formatting changes.
Linked Issues check	✅ Passed	The changes add zero-padding for months and days and include regression tests required by issue #15.
Out of Scope Changes check	✅ Passed	The version update and regression tests directly support the date-formatting fix and are not out of scope.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/add-padding-on-single-digit-dates

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 4 complexity · -1 duplication

Metric	Results
Complexity	4
Duplication	-1

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