Datetime picker - select current datetime

## Summary
Datetime picker needs to provide the ability to set the current date (today) and time (now)

## 💬 Description
A full description of what the component or pattern should be and how it should work.

## 💰 User value
Describe why this is important and how it will help users (either developers, designers or the end-users). Think about how it makes people's lives easier, more accessible or quicker to build stuff.

## 📚 User Stories
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*As an* ICDS user:
*I need*
*So that*

## 📝 Acceptance Criteria
If relevant, describe in full detail the different interactions and edge cases that the component or patterns needs to fulfil.

*Given*
*When*
*Then*

## ✏ Designs
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## 🧾 Guidance
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## Additional info
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No component file, test, design, or guidance is identified in the issue. Start by locating the datetime picker entry point and its existing date and time selection tests; clarify the interaction and edge cases with maintainers, then verify that users can select the current date and current time.

Written by the indexing model from the issue text.