hdk::now()

[ddd-mtl]

Hey folks!
I believe it would be quite useful to add a hdk::now() function to the HDK so we can get the current time in the DNA code. We can't use SystemTime in WASM so doing the same kind of wrapper as hdk::sleep() would be enough.
Currently time has to be provided by the UI which is a bit of a useless overhead, and that solution doesn't work for non user-based events like when receiving direct node to node messages.

A quick hack could be to have hdk::sleep() actually return the current time :)

Let me know what you think!

[StaticallyTypedAnxiety]

This is good! I imagine there is going to be some delay between the initial calling of the zome function and the time it gets executed in the wasm, do we care about this?

[ddd-mtl]

I don't if the delay is reasonable. Less than a second lets say.

[StaticallyTypedAnxiety]

This is not hard to implement, I still want to contribute to the project in my spare time so with @zippy 's blessing I could implement this

[Connoropolous]

Agreed!
There is also the timestamp tacked onto headers, but I've seen code that uses those timestamps and it's really quite tricky and ugly, and doesn't cover all use cases at all.