Internet Message Format Date & Time

Convert
Internet Message Format
date and time strings to and from
POSIX times.

    elm install dmy/elm-imf-date-time

Valid strings include date and time strings conforming to
RFC5322,
as well as the obsolete
RFC2822
and
RFC822, however obsolete formats
are interpreted following
RFC5322 recommendations.

Produced strings conform to
RFC5322,
without using any
obsolete format.

These date and time formats are found for example in
HTTP,
SMTP
and
RSS.

New Internet protocols should most likely NOT use this format.
Alternatives are
POSIX times
as advised
here
or
ISO 8601
following recommendations from
RFC3339.

Examples

import Imf.DateTime
import Time
epoch : Time.Posix
epoch = Time.millisToPosix 0
Imf.DateTime.fromPosix Time.utc epoch
--> "Thu, 01 Jan 1970 00:00:00 +0000"
Imf.DateTime.toPosix "1 Jan 70 00:00:00 GMT"
--> Ok epoch
est : Time.Zone
est = Time.customZone -300 []
Imf.DateTime.toPosix "Fri, 11 Jan 2013 08:11:00 GMT"
    |>  Result.map (Imf.DateTime.fromPosix est)
--> Ok ("Fri, 11 Jan 2013 03:11:00 -0500")