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(*----------------------------------------------------------------------------
Copyright (c) 2015 Inhabited Type LLC.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the author nor the names of his contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND ANY EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------*)
let parse_date_exn s =
try
Scanf.sscanf s "%3s, %d %s %4d %d:%d:%d %s"
(fun _wday mday mon year hour min sec tz ->
let months =
[
("Jan", 1);
("Feb", 2);
("Mar", 3);
("Apr", 4);
("May", 5);
("Jun", 6);
("Jul", 7);
("Aug", 8);
("Sep", 9);
("Oct", 10);
("Nov", 11);
("Dec", 12);
]
in
let parse_tz = function
| "" | "Z" | "GMT" | "UTC" | "UT" -> 0
| "PST" -> -480
| "MST" | "PDT" -> -420
| "CST" | "MDT" -> -360
| "EST" | "CDT" -> -300
| "EDT" -> -240
| s ->
Scanf.sscanf s "%c%02d%_[:]%02d" (fun sign hour min ->
min + (hour * if sign = '-' then -60 else 60))
in
let mon = List.assoc mon months in
let year =
if year < 50 then year + 2000
else if year < 1000 then year + 1900
else year
in
let date = (year, mon, mday) in
let time = ((hour, min, sec), parse_tz tz * 60) in
let ptime = Ptime.of_date_time (date, time) in
match ptime with
| None -> raise (Invalid_argument "Invalid date string")
| Some date -> date)
with
| Scanf.Scan_failure e -> raise (Invalid_argument e)
| Not_found -> raise (Invalid_argument "Invalid date string")
let parse_date s = try Some (parse_date_exn s) with Invalid_argument _ -> None
|