Extend Date/Time sigils to allow `now` with a truncation modifier

[Aleksei Matiushkin]

Hello,

I often find myself writing `DateTime.truncate(DateTime.utc_now(), :second)` or similar stuff to get to the ‘instance’ of now.

What if we have sigils `~U`, `~D`, and `~T` extended to:

~U[now] → DateTime.utc_now()

~T[now] → Time.utc_now()

~D[today] → Date.utc_today() 

with possible modifiers `s` and `m` to truncate times to seconds and milliseconds respectively?

~U[now]s → DateTime.truncate(DateTime.utc_now(), :second)

Here is the PR with the code for the reference https://github.com/elixir-lang/elixir/pull/10840 (it uses empty sigils instead of ~U[now])

[esurk....@gmail.com]

For me, it breaks the semantic of a sigil. I think of a sigil as a text representation of data, and your proposal is a text representation of a function call. In the end, every sigil triggers a function. But I think this should be a pure function.

[Aleksei Matiushkin]

Technically, lowercased sigils are not pure as well.

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