Hi:
Thank you, Elixir community, for building this incredible language and
ecosystem!
I just had a need to truncate a NaiveDateTime to the nearest minute and was
surprised to see that option isn't available.
I'd like to propose something like the following (which I just typed out
but haven't tested):
```
@doc """
Returns the given naive datetime truncated to the given precision
(`:microsecond`, `:millisecond`, `:second`, `:minute` or `:hour`).
The given naive datetime is returned unchanged if it already has lower
precision
than the given precision.
## Examples
iex> NaiveDateTime.truncate(~N[2017-11-06 00:23:51.123456],
:microsecond)
~N[2017-11-06 00:23:51.123456]
iex> NaiveDateTime.truncate(~N[2017-11-06 00:23:51.123456],
:millisecond)
~N[2017-11-06 00:23:51.123]
iex> NaiveDateTime.truncate(~N[2017-11-06 00:23:51.123456], :second)
~N[2017-11-06 00:23:51]
iex> NaiveDateTime.truncate(~N[2017-11-06 00:23:51.123456], :minute)
~N[2017-11-06 00:23:00]
iex> NaiveDateTime.truncate(~N[2017-11-06 00:23:51.123456], :hour)
~N[2017-11-06 00:00:00]
"""
@doc since: "1.6.0"
@spec truncate(t(), :microsecond | :millisecond | :second | :minute |
:hour) :: t()
def truncate(%NaiveDateTime{microsecond: microsecond} = naive_datetime,
:hour) do
%{naive_datetime | minute: 0, second: 0, microsecond:
Calendar.truncate(microsecond, :second)}
end
def truncate(%NaiveDateTime{microsecond: microsecond} = naive_datetime,
:minute) do
%{naive_datetime | second: 0, microsecond:
Calendar.truncate(microsecond, :second)}
end
def truncate(%NaiveDateTime{microsecond: microsecond} = naive_datetime,
precision) do
%{naive_datetime | microsecond: Calendar.truncate(microsecond,
precision)}
end
```
Thank you for considering this idea.
Cheers,
James Lavin
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