Add comprehensive date-time test cases in Danish

[coderabbitai]

As discussed in PR #1, we need to add more comprehensive date-time test cases for the Danish localization. This includes test cases for:

• Morning times (AM period)
• 24-hour format (when use_24hour is true)
• Edge cases like midnight (00:00) and noon (12:00)
• Common minute intervals (00, 15, 30, 45)

Requester: @JarbasAl

Referenced comment: #1 (comment)