Format date with Elixir DateTime to RFC2616 format

Question

I want to implement a piece of code that converts a datetime object like ~U[2022-06-07 18:37:16.842920Z] to a format like Tue, 7 Jun 2022 18:37:16 GMT. I do not want to use the Calendar.DateTime.Format.httpdate since our codebase already uses DateTime.

I need it to send in API headers with RFC2616 format. Any help is appreciated.

Note also that RFC 2616 has been deprecated in 2014. The current standard is RFC 9110, section 5.6.7. — bortzmeyer, Jun 10 '22 at 09:43

score 4 · Accepted Answer · answered Jun 08 '22 at 00:10

4

Elixir 1.11.0 introduced Calendar.strftime/3 that is what you need. Please note that DateTime and Calendar are different built-in modules that serve different purposes. There should be no problem in using them combined.

~U[2022-06-07 18:37:16.842920Z]
|> DateTime.shift_zone!("Etc/UTC")
|> Calendar.strftime("%a, %-d %b %Y %X GMT")
# => "Tue, 7 Jun 2022 18:37:16 GMT"

answered Jun 08 '22 at 00:10

vinibrsl

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Any idea how to use Calendar in Elixir v1.9.4? I keep getting Calendar.strftime is private or unavailable... – give_me_ur_btcns Jun 10 '22 at 07:16
@give_me_ur_btcns https://hex.pm/packages/nimble_strftime – Adam Millerchip Jun 15 '22 at 02:39

Format date with Elixir DateTime to RFC2616 format

1 Answers1