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I have a NaiveDateTime that I need to add timezone data to. For example if I have a naive_date value like ~N[2015-10-03 12:00:00.000000] and I want set it to "America/Los_Angeles" timezone, how is that possible in Elixir?

Murcielago
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2 Answers2

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Using Timex Package, one could:

Update: better solution

iex> use timex

iex> naive_date = ~N[2015-10-03 12:00:00.000000]

iex> Timex.to_datetime(naive_date, "America/Los_Angeles")
#DateTime<2015-10-03 12:00:00-07:00 PDT America/Los_Angeles>

Old solution

use timex

utc_time = DateTime.from_naive!(~N[2015-10-03 12:00:00.000000], "Etc/UTC")

tz_offset =
  Timex.timezone("America/Los_Angeles", utc_time)
  |> Timex.Timezone.total_offset()

Timex.shift(utc_time, seconds: -tz_offset)
  |> Timezone.convert("America/Los_Angeles")
Mario Olivio Flores
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larskris
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    `Timex` is not an Elixir core in the first place and you should at least mention that for this to work the `timex` package should be included into the list of `deps`. – Aleksei Matiushkin Jul 31 '18 at 04:25
7

According the the NaiveDateTime documentation:

We call them "naive" because this datetime representation does not have a time zone.

That means you can't add timezone data to a NaiveDateTime object.

However you can convert a NaiveDateTime to a DateTime that can hold time zone data with DateTime.from_naive!/2:

DateTime.from_naive!(~N[2015-10-03 12:00:00.000000], "Etc/UTC")
Ronan Boiteau
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