Turn rss feed of contests on acmicpc.info into ical format which can be imported into Google calendar , etc automatically

icpc-ics.php

<?php
/*
The MIT License (MIT)
 
Copyright (c) 2014 MY Sun <simonmysun@gmail.com>
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
 
$xml = simplexml_load_file("http://contests.acmicpc.info/contests.rss");
 
header('Content-type: text/calendar; charset=utf-8');
header('Content-Disposition: inline; filename=calendar.ics');
 
date_default_timezone_set('Asia/Shanghai');
ini_set('date.timezone','Asia/Shanghai');
 
echo "BEGIN:VCALENDAR\r\nPRODID:-//acmicpc.info//ICPC_Contests//EN\r\nVERSION:2.0\r\nCALSCALE:GREGORIAN\r\nMETHOD:PUBLISH\r\nX-WR-TIMEZONE:Asia/Shanghai\r\nX-WR-CALNAME:ICPC_Contests\r\nX-WR-CALDESC:ICPC_Contests_ics\r\n";
 
function timeFormat($t)
{
    if($t<=9)
    {
        $res = "0" . $t;
        return $res;
    }
    else
    {
        $res = $t;
        return $res;
    }
}
 
foreach($xml->children()->children() as $child)
{
    if($child->getName() == "item")
    {
        echo "BEGIN:VEVENT\r\n";
        foreach($child->children() as $grand_child)
        {
            if($grand_child->getName() == "pubDate")
            {
                $event_start_time = strtotime($grand_child);
            }
            if($grand_child->getName() == "title")
            {
                $event_title = $grand_child;
            }
            if($grand_child->getName() == "link")
            {
                $event_description = $grand_child;
            }
            if($grand_child->getName() == "guid")
            {
                $event_guid = $grand_child;
            }
        }
        
        $event_start_time = $event_start_time;
        $event_end_time = $event_start_time + 3 * 60 * 60;
 
        echo "DTSTART:TZID=Asia/Shanghai:" . idate("Y", $event_start_time) . timeFormat(idate("m", $event_start_time)) . timeFormat(idate("d", $event_start_time)) . "T" . timeFormat(idate("H", $event_start_time)) . timeFormat(idate("i", $event_start_time)) . timeFormat(idate("s", $event_start_time)) . "Z\r\n";
        echo "DTEND:TZID=Asia/Shanghai:" . idate("Y", $event_end_time) . timeFormat(idate("m", $event_end_time)) . timeFormat(idate("d", $event_end_time)) . "T" . timeFormat(idate("H", $event_end_time)) . timeFormat(idate("i", $event_end_time)) . timeFormat(idate("s", $event_end_time)) . "Z\r\n";
        echo "DTSTAMP:19700101T000000Z\r\n";
        echo "CLASS:PUBLIC\r\n";
        echo "UID:" . $event_guid . "\r\n";
        echo "SUMMARY:" . $event_title . "\r\n";
        echo "DESCRIPTION:" . $event_description . "\r\n";
        echo "END:VEVENT\r\n";
    }
}
echo "END:VCALENDAR\r\n";

I created an 'ics' file using your code however Google Calendar says "导入活动失败：无法处理您的 iCal/CSV 文件。。", What should I do?

• Agenda view: https://calendar.google.com/calendar/embed?mode=AGENDA&src=nquh66g8ichrstbnkjjohfflhbalqj3b%40import.calendar.google.com&ctz=Europe%2FBerlin
• Week view: https://calendar.google.com/calendar/embed?mode=WEEK&src=nquh66g8ichrstbnkjjohfflhbalqj3b%40import.calendar.google.com&ctz=Europe%2FBerlin
• Month view: https://calendar.google.com/calendar/embed?src=nquh66g8ichrstbnkjjohfflhbalqj3b%40import.calendar.google.com&ctz=Europe%2FBerlin

Pay attention to the time zone.

@MrMorning 回复在这里也没个通知。。你可以试试直接加这个：
https://calendar.google.com/calendar/ical/nquh66g8ichrstbnkjjohfflhbalqj3b%40import.calendar.google.com/public/basic.ics

或者用上面链接的右下角的添加按钮