iso8601

An ISO 8601 date formating and parsing library for Erlang

Contents

• About
• Usage
• Known Deficiencies
• License

About ↟

The erlang_iso8601 library was originally created by Sean Sawyer in 2011. In 2016, Sean handed off maintenance of the library to the erlsci Github org at which point the project (and repo) was renamed to simply iso8601, matching its Erlang app name:

• git clone https://github.com/erlsci/iso8601.git

Thanks to Github's forwarding for project renames and moves, the following still work:

• git clone https://github.com/seansawyer/erlang_iso8601.git
• git clone https://github.com/erlsci/erlang_iso8601.git

Usage ↟

Add it to your rebar.config deps:

{iso8601, ".*", {git, "https://github.com/erlsci/iso8601.git", {tag, "1.3"}}}

Or for rebar3:

{iso8601, {git, "https://github.com/erlsci/iso8601.git", {tag, "1.3"}}}

Format a timestamp or calendar datetime tuple:

1> iso8601:format(now()).
<<"2012-02-16T01:06:19Z">>
2> iso8601:format(calendar:universal_time()).
<<"2012-02-16T01:06:48Z">>

Parse a date string or binary:

3> iso8601:parse(<<"2012-02-16T01:06:48Z">>).
{{2012,2,16},{1,6,48}}
4> iso8601:parse("2012-02-16T01:06:48Z").
{{2012,2,16},{1,6,48}}

Add 1 hour, 2 minutes and 3 seconds to a datetime tuple:

5> Datetime = iso8601:parse(<<"2012-02-16T01:06:48Z">>).
{{2012,2,16},{1,6,48}}
6> iso8601:add_time(Datetime, 1, 2, 3).
{{2012,2,16},{2,8,51}}

Subtract 1 hour, 2 minutes and 3 seconds from a datetime tuple:

5> Datetime = iso8601:parse(<<"2012-02-16T01:06:48Z">>).
{{2012,2,16},{1,6,48}}
6> iso8601:subtract_time(Datetime, 1, 2, 3).
{{2012,2,16},{0,4,45}}

Fractional times:

7> iso8601:parse("20120203T040506.50").
{{2012,2,3},{4,5,7}}
8> iso8601:parse_exact("20120203T040506.50").
{{2012,2,3},{4,5,6.50}}

Parse durations:

9> iso8601:parse_duration("+P6Y3M1DT1H1M1.1S").
[{sign, "+"}, {years, 6}, {months, 3}, {days, 1}, {hours, 1}, {minutes, 1}, {seconds, 1}]
10> iso8601:parse_duration("PT6M").
[{sign, []}, {years, 0}, {months, 0}, {days, 0},{hours, 0}, {minutes, 6}, {seconds, 0}]

Known Deficiencies ↟

• Does not support expanded year representation.
• Does not support intervals.

See the open issues for more info.

License ↟

The MIT License (MIT)

Copyright © 2011-2014, Sean Sawyer
Copyright © 2012, Tristan Sloughter
Copyright © 2016-2017, Erlang-Aided Enrichment Center