Proposal: Introduce DateTime/NaiveDateTime.beginning_of_day and DateTime/NaiveDateTime.end_of_day

[thia.md...@gmail.com]

Hello, we have Date.beginning_of_month and Date.end_of_month and similar functions.
Would be nice to have other similar helpers to deal with date and datetime.

iex> DateTime.beginning_of_day(~U[2018-11-15 10:00:00Z])
~U[2018-11-15 00:00:00Z]
iex> NaiveDateTime.beginning_of_day(~N[2000-01-01 23:00:07])
~U[2000-01-01 00:00:00]
iex> DateTime.end_of_day(~U[2018-11-15 10:00:00Z])
~U[2018-11-15 23:59:59Z]
iex> NaiveDateTime.end_of_day(~N[2000-01-01 23:00:07])
~U[2000-01-01 23:59:59]

There are concerns on the compatibility of these functions between different calendars?

What do you think?

[José Valim]

We can add those but those computations would need to be done by the calendars. We can definitely start with beginning of day and end of day. PRs welcome!

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