tzparse

This library's functions are used to retrieve time changes and date/time characteristics for a given TZ. Based on data provided by IANA timezone files and low-level parsing library. System TZfiles default location can be overriden with the TZFILES_DIR environment variable.

There are two functions:

get_zoneinfo parses the tzfile and returns a Tzinfo struct which provides useful and human-readable data about the timezone and can be converted to a json string with an optional feature.

get_timechanges obtains time changes for specified year, or all time changes recorded in the TZfile if no year is specified.

Example with get_zoneinfo:

[dependencies]
tzparse = { version = "1.0.2", features=["json"] }

fn main() {
    println!("{}", tzparse::get_zoneinfo("Europe/Paris").unwrap().to_json().unwrap());
}

Outputs:

{"timezone":"Europe/Paris","utc_datetime":"2020-01-22T14:12:36.792898Z","datetime":"2020-01-22T15:12:36.792898+01:00",
"dst_from":"2020-03-29T01:00:00Z","dst_until":"2020-10-25T01:00:00Z","dst_period":false,"raw_offset":3600,
"dst_offset":7200,"utc_offset":"+01:00","abbreviation":"CET","week_number":4}

The get_timechanges function for Europe/Paris in 2019 returns:

[Timechange { time: 2019-03-31T01:00:00Z, gmtoff: 7200, isdst: true, abbreviation: "CEST" },
Timechange { time: 2019-10-27T01:00:00Z, gmtoff: 3600, isdst: false, abbreviation: "CET" }]

Be aware that with 1.0.0 Tzinfo struct and functions have received some changes (2 more fields and Result instead of Option return types).

License: GPL-3.0