add DateTimeStyles to DateTime(Offset)ValueRetriever

[bollhals]

This change adds a way to modify the DateTimeStyles used when parsing.

Types of changes

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• Performance improvement
• Refactoring (so no functional change)
• Other (docs, build config, etc)

Checklist:

• I've added tests for my code. (most of the time mandatory)
• I have added an entry to the changelog. (mandatory)
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[SabotageAndi]

I like this idea.
Would you have some time to add a paragraph to https://github.com/SpecFlowOSS/SpecFlow/blob/master/docs/Bindings/Step-Argument-Conversions.md?

[bollhals]

Sure, will update the docs and forward integrate 👍

[bollhals]

I like this idea. Would you have some time to add a paragraph to https://github.com/SpecFlowOSS/SpecFlow/blob/master/docs/Bindings/Step-Argument-Conversions.md?

@SabotageAndi But this isn't used for Step-Argument-Conversions is-it? Should I add it to SpecFlow.Assist-Helpers?

[SabotageAndi]

@bollhals You are completely right.

[bollhals]

Can you check if the doc is fine for you?

[SabotageAndi]

Perfect @bollhals!