├── .gitignore ├── README.md ├── sun.php ├── daylight.php └── LICENSE /.gitignore: -------------------------------------------------------------------------------- 1 | ### WordPress ### 2 | *.log 3 | wp-config.php 4 | wp-content/advanced-cache.php 5 | wp-content/backup-db/ 6 | wp-content/backups/ 7 | wp-content/blogs.dir/ 8 | wp-content/cache/ 9 | wp-content/upgrade/ 10 | wp-content/uploads/ 11 | wp-content/mu-plugins/ 12 | wp-content/wp-cache-config.php 13 | wp-content/plugins/hello.php 14 | 15 | /.htaccess 16 | /license.txt 17 | /readme.html 18 | /sitemap.xml 19 | /sitemap.xml.gz 20 | 21 | ### Mac OS ### 22 | #Mac OS General 23 | .DS_Store 24 | .AppleDouble 25 | .LSOverride 26 | 27 | #Mac OS Icon must end with two \r 28 | Icon 29 | 30 | #Mac OS Thumbnails 31 | ._* 32 | 33 | #Mac OS Files that might appear in the root of a volume 34 | .DocumentRevisions-V100 35 | .fseventsd 36 | .Spotlight-V100 37 | .TemporaryItems 38 | .Trashes 39 | .VolumeIcon.icns 40 | .com.apple.timemachine.donotpresent 41 | 42 | #Mac OS Directories potentially created on remote AFP share 43 | .AppleDB 44 | .AppleDesktop 45 | Network Trash Folder 46 | Temporary Items 47 | .apdisk 48 | 49 | ### Windows ### 50 | #Windows thumbnail cache files 51 | Thumbs.db 52 | ehthumbs.db 53 | ehthumbs_vista.db 54 | 55 | #Windows Dump file 56 | *.stackdump 57 | 58 | #Windows Folder config file 59 | [Dd]esktop.ini 60 | 61 | #Windows Recycle Bin used on file shares 62 | $RECYCLE.BIN/ 63 | 64 | #Windows Installer files 65 | *.cab 66 | *.msi 67 | *.msix 68 | *.msm 69 | *.msp 70 | 71 | #Windows shortcuts 72 | *.lnk 73 | 74 | ### Dropbox ### 75 | #Dropbox settings and caches 76 | .dropbox 77 | .dropbox.attr 78 | .dropbox.cache 79 | 80 | ### My Additional Rules ### 81 | *.bak 82 | *.cache 83 | *.secret.php 84 | error_log 85 | /Nebula-Child/data/ -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Daylight Calendar ICS 2 | 3 | This is a dynamically generated .ics calendar that you can host and subscribe to in Google Calendar, iCal, or other calendar software. 4 | 5 | Not only will it provide an event each day with the appropriate sunrise and sunset time, it will show the length of the day in hours/minutes as well as in a percent (of 24 hours) and the solar noon for that day. It will also give a percentile compared to the shortest and longest days of the year! 6 | 7 | ## Options 8 | 9 | - [Find your geo coordinates](https://www.latlong.net/) 10 | - [Find your timezone name](https://www.php.net/manual/en/timezones.php) 11 | - [Find your GMT offset](http://en.wikipedia.org/wiki/List_of_UTC_time_offsets#mediaviewer/File:World_Time_Zones_Map.png) 12 | 13 | ## Instructions 14 | 15 | - Upload `daylight.php` and/or `sun.php` to your server (or skip this step and use the one hosted on [gearside.com](https://gearside.com/calendars/daylight.php)) 16 | - Point your calendar to the file and use query parameters for the options above. 17 | - Latitude: `lat` 18 | - Longitude: `lng` 19 | - Timezone (preferred way): `timezone` 20 | - GMT Offset (alternate way): `gmt` 21 | - Year: `year` 22 | - Event types (`sun.php` only): 23 | - `actual` 24 | - `civil` 25 | - `nautical` 26 | - `astronomical` 27 | - `all` 28 | 29 | Use `?debug` to directly view the calendar file in a browser with events more easily readable. Be sure not to use `?debug` when subscribing to your calendar as it does not declare itself as an .ics file with that parameter present. 30 | 31 | ## Examples 32 | 33 | #### Basic 34 | 35 | Most reliable method: 36 | `https://gearside.com/calendars/daylight.php?lat=43.1234&lng=-76.1234&timezone=America/New_York` 37 | 38 | Your mileage may vary if only passing GMT offset: 39 | `https://gearside.com/calendars/daylight.php?lat=43.1234&lng=-76.1234&gmt=-5` 40 | 41 | `https://gearside.com/calendars/sun.php?lat=43.1234&lng=-76.1234&gmt=-5&all` 42 | 43 | ## Notes 44 | 45 | Calendar software caches remote .ics files (like this one), so when replacing it you can "bust" the cache by adding another query parameter of random characters such as `&sdfgsfd`. 46 | 47 | - [More information available at Gearside.com](https://gearside.com/google-daylight-calendar/) 48 | -------------------------------------------------------------------------------- /sun.php: -------------------------------------------------------------------------------- 1 | 43 | BEGIN:VCALENDAR 44 | VERSION:2.0 45 | PRODID:-//hacksw/handcal//NONSGML v1.0//EN 46 | CALSCALE:GREGORIAN 47 | METHOD:PUBLISH 48 | X-WR-CALNAME:Gearside - Daylight 49 | array( 54 | 'start' => 0, 55 | 'end' => 0, 56 | 'length' => 0, 57 | 'name' => 'Sunrise' 58 | ), 59 | 'sunset' => array( 60 | 'start' => 0, 61 | 'end' => 0, 62 | 'length' => 0, 63 | 'name' => 'Sunset' 64 | ), 65 | 'civil morning' => array( 66 | 'start' => 0, 67 | 'end' => 0, 68 | 'length' => 0, 69 | 'name' => 'Civil Twilight' 70 | ), 71 | 'civil evening' => array( 72 | 'start' => 0, 73 | 'end' => 0, 74 | 'length' => 0, 75 | 'name' => 'Civil Twilight' 76 | ), 77 | 'nautical morning' => array( 78 | 'start' => 0, 79 | 'end' => 0, 80 | 'length' => 0, 81 | 'name' => 'Nautical Twilight' 82 | ), 83 | 'nautical evening' => array( 84 | 'start' => 0, 85 | 'end' => 0, 86 | 'length' => 0, 87 | 'name' => 'Nautical Twilight' 88 | ), 89 | 'astronomical morning' => array( 90 | 'start' => 0, 91 | 'end' => 0, 92 | 'length' => 0, 93 | 'name' => 'Astronomical Twilight' 94 | ), 95 | 'astronomical evening' => array( 96 | 'start' => 0, 97 | 'end' => 0, 98 | 'length' => 0, 99 | 'name' => 'Astronomical Twilight' 100 | ) 101 | ); 102 | 103 | //Need to do this separate from and after the creation of the above array so it can self-reference other keys 104 | if ( isset($_GET['actual']) || isset($_GET['all']) ){ 105 | $events['sunrise']['start'] = strtotime($date . '+1 year ' . date_sunrise(strtotime($date), SUNFUNCS_RET_STRING, $lat, $lng, 90.83, $gmt)); 106 | $events['sunset']['start'] = strtotime($date . '+1 year ' . date_sunset(strtotime($date), SUNFUNCS_RET_STRING, $lat, $lng, 90.83, $gmt)); 107 | $events['sunrise']['length'] = $length*60; //Minutes in seconds (Default: 15 minutes) 108 | $events['sunset']['length'] = $length*60; //Minutes in seconds (Default: 15 minutes) 109 | $events['sunrise']['end'] = $events['sunrise']['start']+$events['sunrise']['length']; 110 | $events['sunset']['end'] = $events['sunset']['start']+$events['sunset']['length']; 111 | } 112 | 113 | if ( isset($_GET['civil']) || isset($_GET['all']) ){ 114 | $events['civil morning']['start'] = strtotime($date . '+1 year ' . date_sunrise(strtotime($date), SUNFUNCS_RET_STRING, $lat, $lng, 96, $gmt)); 115 | $events['civil evening']['start'] = strtotime($date . '+1 year ' . date_sunset(strtotime($date), SUNFUNCS_RET_STRING, $lat, $lng, 96, $gmt)); 116 | $events['civil morning']['length'] = $events['sunrise']['start']-$events['civil morning']['start']; 117 | $events['civil evening']['length'] = $events['civil evening']['start']-$events['sunset']['start']; 118 | $events['civil morning']['end'] = $events['civil morning']['start']+$events['civil morning']['length']; 119 | $events['civil evening']['end'] = $events['civil evening']['start']+$events['civil evening']['length']; 120 | } 121 | 122 | if ( isset($_GET['nautical']) || isset($_GET['all']) ){ 123 | $events['nautical morning']['start'] = strtotime($date . '+1 year ' . date_sunrise(strtotime($date), SUNFUNCS_RET_STRING, $lat, $lng, 102, $gmt)); 124 | $events['nautical evening']['start'] = strtotime($date . '+1 year ' . date_sunset(strtotime($date), SUNFUNCS_RET_STRING, $lat, $lng, 102, $gmt)); 125 | $events['nautical morning']['length'] = $events['civil morning']['start']-$events['nautical morning']['start']; 126 | $events['nautical evening']['length'] = $events['nautical evening']['start']-$events['civil evening']['start']; 127 | $events['nautical morning']['end'] = $events['nautical morning']['start']+$events['nautical morning']['length']; 128 | $events['nautical evening']['end'] = $events['nautical evening']['start']+$events['nautical evening']['length']; 129 | } 130 | 131 | if ( isset($_GET['astronomical']) || isset($_GET['all']) ){ 132 | $events['astronomical morning']['start'] = strtotime($date . '+1 year ' . date_sunrise(strtotime($date), SUNFUNCS_RET_STRING, $lat, $lng, 108, $gmt)); 133 | $events['astronomical evening']['start'] = strtotime($date . '+1 year ' . date_sunset(strtotime($date), SUNFUNCS_RET_STRING, $lat, $lng, 108, $gmt)); 134 | $events['astronomical morning']['length'] = $events['nautical morning']['start']-$events['astronomical morning']['start']; 135 | $events['astronomical evening']['length'] = $events['astronomical evening']['start']-$events['nautical evening']['start']; 136 | $events['astronomical morning']['end'] = $events['astronomical morning']['start']+$events['astronomical morning']['length']; 137 | $events['astronomical evening']['end'] = $events['astronomical evening']['start']+$events['astronomical evening']['length']; 138 | } 139 | 140 | $dst = ( date('I', strtotime($date . '+1 year +12 hours')) ) ? 1 : 0; 141 | 142 | $last_sync = ( $date == date('Y-m-d', strtotime('Today -1 Year')) && 1==2 ) ? ' [Last Sync]' : ''; 143 | 144 | if ( $debug == 1 || array_key_exists('debug', $_GET) ){ 145 | echo "\r\n\r\n------------------\r\n"; 146 | echo ( $date == date('Y-m-d', strtotime('Today -1 Year')) ) ? "(Today!) " : ""; 147 | echo "Debug Info\r\n"; 148 | echo "Last Modified: " . date('l, F j, Y', filemtime(__FILE__)) . "\r\n"; 149 | echo "Date (-1 Year): " . $date . "\r\n"; 150 | echo "Timezone: Requested: " . $gmt . ", Server: " . date_default_timezone_get() . "\r\n"; 151 | echo ( $dst ) ? "DST?: Yes\r\n" : "DST?: No\r\n"; 152 | 153 | foreach ( $events as $event ){ 154 | if ( $event['start'] === 0 ){ 155 | continue; //Skip any events that do not have data 156 | } 157 | 158 | echo $event['name'] . ": " . date('g:ia', strtotime(date('F j Y g:ia', $event['start']) . ' +' . $dst . ' hours')) . ' to ' . date('g:ia', strtotime(date('F j Y g:ia', $event['end']) . ' +' . $dst . ' hours')) . "\r\n\r\n"; 159 | } 160 | 161 | echo "\r\n"; 162 | } 163 | ?> 164 | 165 | 170 | BEGIN:VEVENT 171 | CREATED: 172 | DTSTART: 173 | DTEND: 174 | DTSTAMP: 175 | LAST-MODIFIED: 176 | UID: 177 | DESCRIPTION: 178 | URL;VALUE=URI: 179 | SUMMARY: 180 | RRULE:FREQ=YEARLY;COUNT=3 181 | END:VEVENT 182 | 183 | 192 | END:VCALENDAR 193 | 194 | 195 | X-WR-CALDESC:Visualize daylight -------------------------------------------------------------------------------- /daylight.php: -------------------------------------------------------------------------------- 1 | setTimezone(new DateTimeZone("UTC")); //Now update the timezone to UTC 44 | $utc_timestamp = $given->format('Ymd\THis\Z') . "\n"; //Output the UTC timestamp in ISO standard format 45 | return $utc_timestamp; 46 | } 47 | 48 | //Escape strings 49 | function escape_string($string) { 50 | return preg_replace('/([\,;])/','\\\$1', $string); 51 | } 52 | 53 | $year = ( isset($_GET['year']) )? intval($_GET['year']) : date('Y'); 54 | $lat = ( isset($_GET['lat']) )? floatval($_GET['lat']) : 43.0469; 55 | $lng = ( isset($_GET['lng']) )? floatval($_GET['lng']) : -76.1444; 56 | 57 | $timezone = 'America/New_York'; //Default to American Eastern timezone 58 | if ( isset($_GET['timezone']) ){ //If a timezone name is provided, use it 59 | $timezone = $_GET['timezone']; 60 | } elseif ( isset($_GET['gmt']) ){ //If a GMT offset is provided, try to find an equivalent timezone 61 | $timezone_list = DateTimeZone::listIdentifiers(); //Get the list of all timezones 62 | foreach ( $all_timezones as $timezone_to_check ){ //Loop through all of the timezones 63 | $tz = new DateTimeZone($timezone_to_check); 64 | $offset = $tz->getOffset(new DateTime()); //Get the offset in seconds from UTC for the timezone 65 | $offset_hours = $offset/3600; //Convert the offset to hours 66 | if ( $offset_hours == intval($_GET['gmt']) ){ //If the offset hours matches the GMT offset, use that timezone 67 | $timezone = $timezone_to_check; 68 | break; //Exit the loop 69 | } 70 | } 71 | } 72 | 73 | date_default_timezone_set($timezone); //Now use the timezone that was determined above 74 | 75 | function is_syracuse($lat=false, $lng=false){ 76 | if ( isset($_GET['syracuse']) ){ 77 | return true; 78 | } 79 | 80 | if ( $lat == 43.0469 && $lng == -76.1444 ){ //Could make this a little more flexible with >= <= 81 | return true; 82 | } 83 | 84 | return false; 85 | } 86 | 87 | //Shortest Day Length 88 | $shortest_date = $year . '-12-21'; 89 | $shortest_sun_info = date_sun_info(strtotime($shortest_date), $lat, $lng); 90 | $shortest_sunrise = $shortest_sun_info['sunrise']; 91 | $shortest_sunset = $shortest_sun_info['sunset']; 92 | $shortest_length = $shortest_sunset-$shortest_sunrise; 93 | 94 | //Longest Day Length 95 | $longest_date = $year . '-06-21'; 96 | $longest_sun_info = date_sun_info(strtotime($longest_date), $lat, $lng); 97 | $longest_sunrise = $longest_sun_info['sunrise']; 98 | $longest_sunset = $longest_sun_info['sunset']; 99 | $longest_length = $longest_sunset-$longest_sunrise; 100 | 101 | //Current weather forecast 102 | $weather_forecast = array(); 103 | $weather_forecast_summary = ''; 104 | if ( is_syracuse($lat, $lng) ){ 105 | //Weather Forecast 106 | $weather_json = file_get_contents('/home/gearside/public_html/weather.gearside.com/v2/data/weather-owm.json'); 107 | if ( !empty($weather_json) ){ 108 | $weather_forecast_data = json_decode($weather_json); 109 | if ( is_string($weather_forecast_data) ){ 110 | $weather_forecast_data = json_decode($weather_forecast_data); //Decode it again if it is not yet an array. Dunno why I need to do this but it is necessary. 111 | } 112 | 113 | foreach ( $weather_forecast_data->daily as $forecast_day ){ 114 | $weather_forecast['day' . date('Ymd', $forecast_day->dt)] = array( 115 | 'date' => $forecast_day->dt, //UTC time 116 | 'high' => round($forecast_day->temp->max) . '°F', 117 | 'low' => round($forecast_day->temp->min) . '°F', 118 | 'feels_like' => round($forecast_day->feels_like->day) . '°F', //Not using this because there is not a "max", and "day" is not equivalent to be accurate 119 | 'humidity' => round($forecast_day->humidity) . '%', //Percent 120 | 'wind' => ( $forecast_day->wind_speed > 18 )? round($forecast_day->wind_speed) . 'mph' : '', //Already in MPH from source. Only show if it is high 121 | 'pop' => round(($forecast_day->pop)*100), //Percent 122 | //'pop_type' => '', //This is not explicitly provided. Would need to do the math on ->rain vs. ->snow 123 | 'snow_accumulation' => ( !empty($forecast_day->snow) && $forecast_day->snow*0.0393701 > 0.2 )? round($forecast_day->snow*0.0393701, 1) . '"' : '', //Convert millimeters to inches. Only show if more than 1/4" 124 | 'forecast' => ucwords($forecast_day->weather[0]->main), 125 | 'description' => ucwords($forecast_day->weather[0]->description), 126 | 'icon' => get_weather_emoji($forecast_day->weather[0]->main, $forecast_day->weather[0]->description, $forecast_day->temp->max) //Combine the main, summary, and high temperature to figure out the icons 127 | ); 128 | } 129 | } 130 | } 131 | 132 | //Determine emoji icon based on forecast summary 133 | //https://emojipedia.org/search/?q=weather 134 | function get_weather_emoji($main='', $description='', $high=false){ 135 | $forecast = strtolower($main) .' ' . strtolower($description); 136 | 137 | $emoji_icon = ''; 138 | if ( strpos($forecast, 'mostly') !== false || strpos($forecast, 'partly') !== false ){ 139 | $emoji_icon = '⛅'; 140 | } elseif ( strpos($forecast, 'cloud') !== false || strpos($forecast, 'fog') !== false ){ 141 | $emoji_icon = '☁️'; 142 | } elseif ( strpos($forecast, 'sunny') !== false || strpos($forecast, 'clear') !== false ){ 143 | $emoji_icon = '☀️'; 144 | } elseif ( strpos($forecast, 'snow') !== false ){ 145 | $emoji_icon = '❄️'; 146 | } elseif ( strpos($forecast, 'rain') !== false || strpos($forecast, 'shower') !== false ){ 147 | $emoji_icon = '🌧️'; 148 | } elseif ( strpos($forecast, 'storm') !== false ){ 149 | $emoji_icon = '⛈️'; 150 | } elseif ( strpos($forecast, 'wind') !== false ){ 151 | $emoji_icon = '🌬️'; 152 | } 153 | 154 | $rounded_high = round($high); 155 | if ( !empty($rounded_high) ){ 156 | if ( $rounded_high >= 90 ){ 157 | $emoji_icon .= '🥵'; 158 | } elseif ( $rounded_high >= 75 ){ 159 | $emoji_icon .= '🔴'; 160 | } elseif ( $rounded_high >= 60 ){ 161 | $emoji_icon .= '🟠'; 162 | } elseif ( $rounded_high >= 45 ){ 163 | $emoji_icon .= '🟣'; 164 | } elseif ( $rounded_high >= 32 ){ 165 | $emoji_icon .= '🔵'; 166 | } elseif ( $rounded_high < 32 ){ 167 | $emoji_icon .= '🥶'; 168 | } 169 | } 170 | 171 | return $emoji_icon; 172 | } 173 | 174 | ?> 175 | BEGIN:VCALENDAR 176 | VERSION:2.0 177 | PRODID:-//hacksw/handcal//NONSGML v1.0//EN 178 | CALSCALE:GREGORIAN 179 | METHOD:PUBLISH 180 | X-WR-CALNAME:Gearside - Daylight 181 | 0 ){ //Prevent division by 0 215 | $length_percentile = round((($length-$shortest_length)*100)/($longest_length-$shortest_length), 1); 216 | } 217 | 218 | //Add the weather info to the summary if it matches the date correctly 219 | $weather_forecast_summary = ''; //Empty this variable each time 220 | $weather_icon = ''; //Default emoji icon. 221 | if ( !empty($weather_forecast) ){ //If we have weather data 222 | $this_weather_day = 'day' . date('Ymd', strtotime($date . '+1 year ')); 223 | if ( !empty($weather_forecast[$this_weather_day]) ){ //If we have weather data for this specific day 224 | $weather_icon = $weather_forecast[$this_weather_day]['icon']; 225 | $weather_forecast_summary = ' ' . $weather_forecast[$this_weather_day]['forecast'] . ' (High: ' . $weather_forecast[$this_weather_day]['high'] . ', Low ' . $weather_forecast[$this_weather_day]['low'] . ').'; 226 | 227 | if ( !empty($weather_forecast[$this_weather_day]['pop']) && $weather_forecast[$this_weather_day]['pop'] != 0 ){ 228 | $precip_icon = ( $weather_forecast[$this_weather_day]['pop'] >= 90 )? '💦' : ''; 229 | $weather_forecast_summary .= ' ' . $precip_icon . ' ' . $weather_forecast[$this_weather_day]['pop'] . '% chance of precipitation.'; 230 | } 231 | 232 | if ( !empty($weather_forecast[$this_weather_day]['wind']) ){ 233 | $weather_forecast_summary .= ' ⚠️ Windy (' . $weather_forecast[$this_weather_day]['wind'] . ').'; 234 | } 235 | 236 | if ( !empty($weather_forecast[$this_weather_day]['snow_accumulation']) ){ 237 | $weather_forecast_summary .= ' ⚠️ ' . $weather_forecast[$this_weather_day]['snow_accumulation'] . ' Snow.'; 238 | } 239 | } 240 | } 241 | 242 | //Only show the solar noon time if weather is unavailable (to avoid clutter). 243 | $solar_noon_summary = ''; 244 | if ( empty($weather_forecast_summary) ){ 245 | $solar_noon_summary = 'Solar noon: ' . date('g:ia', intval($solar_noon)) . '.'; 246 | } 247 | 248 | if ( is_debug() ){ 249 | echo "\r\n------------------\r\n"; 250 | echo ( $date == date('Y-m-d', strtotime('Today -1 Year')) ) ? "(Today!) " : ""; 251 | echo "Debug Info\r\n"; 252 | echo "Last Modified: " . date('l, F j, Y', filemtime(__FILE__)) . "\r\n"; 253 | echo "Date (-1 Year): " . $date . "\r\n"; 254 | echo "Timezone Used: " . $timezone . "\r\n"; 255 | echo "Sunrise: " . $sunrise . "\r\n"; 256 | echo "Sunset: " . $sunset . "\r\n"; 257 | echo "Daylight: " . date('l, F j Y, g:ia', $sunrise) . ' to ' . date('l, F j Y, g:ia', $sunset) . "\r\n"; 258 | echo "Length: " . $hours . "h " . $minutes . "m (" . round($percent, 1) . "%) of daylight\r\n"; 259 | echo "Solar Noon: " . date('g:ia', intval($solar_noon)) . "\r\n"; 260 | if ( is_syracuse($lat, $lng) ) { 261 | echo "Syracuse Detected! This request is eligible for a weather forecast!\r\n"; 262 | } 263 | echo "Civil: " . date('g:ia', $sunrise_civil) . ' to ' . date('g:ia', $sunset_civil) . " (There is enough natural sunlight that artificial light may not be required to carry out human activities.)\r\n"; 264 | echo "Nautical: " . date('g:ia', $sunrise_nautical) . ' to ' . date('g:ia', $sunset_nautical) . " (The point at which the horizon stops being visible at sea)\r\n"; 265 | echo "Astronomical: " . date('g:ia', $sunrise_astronomical) . ' to ' . date('g:ia', $sunset_astronomical) . " (The point when Sun stops being a source of any illumination)\r\n"; 266 | echo "\r\nShortest day this year: " . $shortest_length . "\r\n"; 267 | echo "Longest day this year: " . $longest_length . "\r\n"; 268 | echo "This day length: " . $length . "\r\n"; 269 | echo $length_percentile . " Percentile\r\n"; 270 | echo ( !empty($weather_forecast_summary) )? $weather_forecast_summary : '(No forecast for this date)'; 271 | 272 | echo "\r\n"; 273 | } 274 | ?> 275 | BEGIN:VEVENT 276 | CREATED: 277 | DTSTART: 278 | DTEND: 279 | DTSTAMP: 280 | LAST-MODIFIED: 281 | UID: 282 | DESCRIPTION: 293 | URL;VALUE=URI: 294 | SUMMARY: 295 | RRULE:FREQ=YEARLY;COUNT=3 296 | END:VEVENT 297 | 306 | END:VCALENDAR 307 | 308 | 309 | X-WR-CALDESC:Visualize daylight -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. 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Each licensee is addressed as "you". 71 | 72 | Activities other than copying, distribution and modification are not 73 | covered by this License; they are outside its scope. The act of 74 | running the Program is not restricted, and the output from the Program 75 | is covered only if its contents constitute a work based on the 76 | Program (independent of having been made by running the Program). 77 | Whether that is true depends on what the Program does. 78 | 79 | 1. You may copy and distribute verbatim copies of the Program's 80 | source code as you receive it, in any medium, provided that you 81 | conspicuously and appropriately publish on each copy an appropriate 82 | copyright notice and disclaimer of warranty; keep intact all the 83 | notices that refer to this License and to the absence of any warranty; 84 | and give any other recipients of the Program a copy of this License 85 | along with the Program. 86 | 87 | You may charge a fee for the physical act of transferring a copy, and 88 | you may at your option offer warranty protection in exchange for a fee. 89 | 90 | 2. You may modify your copy or copies of the Program or any portion 91 | of it, thus forming a work based on the Program, and copy and 92 | distribute such modifications or work under the terms of Section 1 93 | above, provided that you also meet all of these conditions: 94 | 95 | a) You must cause the modified files to carry prominent notices 96 | stating that you changed the files and the date of any change. 97 | 98 | b) You must cause any work that you distribute or publish, that in 99 | whole or in part contains or is derived from the Program or any 100 | part thereof, to be licensed as a whole at no charge to all third 101 | parties under the terms of this License. 102 | 103 | c) If the modified program normally reads commands interactively 104 | when run, you must cause it, when started running for such 105 | interactive use in the most ordinary way, to print or display an 106 | announcement including an appropriate copyright notice and a 107 | notice that there is no warranty (or else, saying that you provide 108 | a warranty) and that users may redistribute the program under 109 | these conditions, and telling the user how to view a copy of this 110 | License. (Exception: if the Program itself is interactive but 111 | does not normally print such an announcement, your work based on 112 | the Program is not required to print an announcement.) 113 | 114 | These requirements apply to the modified work as a whole. If 115 | identifiable sections of that work are not derived from the Program, 116 | and can be reasonably considered independent and separate works in 117 | themselves, then this License, and its terms, do not apply to those 118 | sections when you distribute them as separate works. But when you 119 | distribute the same sections as part of a whole which is a work based 120 | on the Program, the distribution of the whole must be on the terms of 121 | this License, whose permissions for other licensees extend to the 122 | entire whole, and thus to each and every part regardless of who wrote it. 123 | 124 | Thus, it is not the intent of this section to claim rights or contest 125 | your rights to work written entirely by you; rather, the intent is to 126 | exercise the right to control the distribution of derivative or 127 | collective works based on the Program. 128 | 129 | In addition, mere aggregation of another work not based on the Program 130 | with the Program (or with a work based on the Program) on a volume of 131 | a storage or distribution medium does not bring the other work under 132 | the scope of this License. 133 | 134 | 3. You may copy and distribute the Program (or a work based on it, 135 | under Section 2) in object code or executable form under the terms of 136 | Sections 1 and 2 above provided that you also do one of the following: 137 | 138 | a) Accompany it with the complete corresponding machine-readable 139 | source code, which must be distributed under the terms of Sections 140 | 1 and 2 above on a medium customarily used for software interchange; or, 141 | 142 | b) Accompany it with a written offer, valid for at least three 143 | years, to give any third party, for a charge no more than your 144 | cost of physically performing source distribution, a complete 145 | machine-readable copy of the corresponding source code, to be 146 | distributed under the terms of Sections 1 and 2 above on a medium 147 | customarily used for software interchange; or, 148 | 149 | c) Accompany it with the information you received as to the offer 150 | to distribute corresponding source code. (This alternative is 151 | allowed only for noncommercial distribution and only if you 152 | received the program in object code or executable form with such 153 | an offer, in accord with Subsection b above.) 154 | 155 | The source code for a work means the preferred form of the work for 156 | making modifications to it. For an executable work, complete source 157 | code means all the source code for all modules it contains, plus any 158 | associated interface definition files, plus the scripts used to 159 | control compilation and installation of the executable. However, as a 160 | special exception, the source code distributed need not include 161 | anything that is normally distributed (in either source or binary 162 | form) with the major components (compiler, kernel, and so on) of the 163 | operating system on which the executable runs, unless that component 164 | itself accompanies the executable. 165 | 166 | If distribution of executable or object code is made by offering 167 | access to copy from a designated place, then offering equivalent 168 | access to copy the source code from the same place counts as 169 | distribution of the source code, even though third parties are not 170 | compelled to copy the source along with the object code. 171 | 172 | 4. You may not copy, modify, sublicense, or distribute the Program 173 | except as expressly provided under this License. Any attempt 174 | otherwise to copy, modify, sublicense or distribute the Program is 175 | void, and will automatically terminate your rights under this License. 176 | However, parties who have received copies, or rights, from you under 177 | this License will not have their licenses terminated so long as such 178 | parties remain in full compliance. 179 | 180 | 5. You are not required to accept this License, since you have not 181 | signed it. However, nothing else grants you permission to modify or 182 | distribute the Program or its derivative works. These actions are 183 | prohibited by law if you do not accept this License. Therefore, by 184 | modifying or distributing the Program (or any work based on the 185 | Program), you indicate your acceptance of this License to do so, and 186 | all its terms and conditions for copying, distributing or modifying 187 | the Program or works based on it. 188 | 189 | 6. Each time you redistribute the Program (or any work based on the 190 | Program), the recipient automatically receives a license from the 191 | original licensor to copy, distribute or modify the Program subject to 192 | these terms and conditions. You may not impose any further 193 | restrictions on the recipients' exercise of the rights granted herein. 194 | You are not responsible for enforcing compliance by third parties to 195 | this License. 196 | 197 | 7. If, as a consequence of a court judgment or allegation of patent 198 | infringement or for any other reason (not limited to patent issues), 199 | conditions are imposed on you (whether by court order, agreement or 200 | otherwise) that contradict the conditions of this License, they do not 201 | excuse you from the conditions of this License. If you cannot 202 | distribute so as to satisfy simultaneously your obligations under this 203 | License and any other pertinent obligations, then as a consequence you 204 | may not distribute the Program at all. For example, if a patent 205 | license would not permit royalty-free redistribution of the Program by 206 | all those who receive copies directly or indirectly through you, then 207 | the only way you could satisfy both it and this License would be to 208 | refrain entirely from distribution of the Program. 209 | 210 | If any portion of this section is held invalid or unenforceable under 211 | any particular circumstance, the balance of the section is intended to 212 | apply and the section as a whole is intended to apply in other 213 | circumstances. 214 | 215 | It is not the purpose of this section to induce you to infringe any 216 | patents or other property right claims or to contest validity of any 217 | such claims; this section has the sole purpose of protecting the 218 | integrity of the free software distribution system, which is 219 | implemented by public license practices. Many people have made 220 | generous contributions to the wide range of software distributed 221 | through that system in reliance on consistent application of that 222 | system; it is up to the author/donor to decide if he or she is willing 223 | to distribute software through any other system and a licensee cannot 224 | impose that choice. 225 | 226 | This section is intended to make thoroughly clear what is believed to 227 | be a consequence of the rest of this License. 228 | 229 | 8. If the distribution and/or use of the Program is restricted in 230 | certain countries either by patents or by copyrighted interfaces, the 231 | original copyright holder who places the Program under this License 232 | may add an explicit geographical distribution limitation excluding 233 | those countries, so that distribution is permitted only in or among 234 | countries not thus excluded. In such case, this License incorporates 235 | the limitation as if written in the body of this License. 236 | 237 | 9. The Free Software Foundation may publish revised and/or new versions 238 | of the General Public License from time to time. Such new versions will 239 | be similar in spirit to the present version, but may differ in detail to 240 | address new problems or concerns. 241 | 242 | Each version is given a distinguishing version number. If the Program 243 | specifies a version number of this License which applies to it and "any 244 | later version", you have the option of following the terms and conditions 245 | either of that version or of any later version published by the Free 246 | Software Foundation. If the Program does not specify a version number of 247 | this License, you may choose any version ever published by the Free Software 248 | Foundation. 249 | 250 | 10. If you wish to incorporate parts of the Program into other free 251 | programs whose distribution conditions are different, write to the author 252 | to ask for permission. For software which is copyrighted by the Free 253 | Software Foundation, write to the Free Software Foundation; we sometimes 254 | make exceptions for this. Our decision will be guided by the two goals 255 | of preserving the free status of all derivatives of our free software and 256 | of promoting the sharing and reuse of software generally. 257 | 258 | NO WARRANTY 259 | 260 | 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY 261 | FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN 262 | OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES 263 | PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED 264 | OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 265 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS 266 | TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE 267 | PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, 268 | REPAIR OR CORRECTION. 269 | 270 | 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 271 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR 272 | REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, 273 | INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING 274 | OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED 275 | TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY 276 | YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER 277 | PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE 278 | POSSIBILITY OF SUCH DAMAGES. 279 | 280 | END OF TERMS AND CONDITIONS 281 | 282 | How to Apply These Terms to Your New Programs 283 | 284 | If you develop a new program, and you want it to be of the greatest 285 | possible use to the public, the best way to achieve this is to make it 286 | free software which everyone can redistribute and change under these terms. 287 | 288 | To do so, attach the following notices to the program. It is safest 289 | to attach them to the start of each source file to most effectively 290 | convey the exclusion of warranty; and each file should have at least 291 | the "copyright" line and a pointer to where the full notice is found. 292 | 293 | {description} 294 | Copyright (C) {year} {fullname} 295 | 296 | This program is free software; you can redistribute it and/or modify 297 | it under the terms of the GNU General Public License as published by 298 | the Free Software Foundation; either version 2 of the License, or 299 | (at your option) any later version. 300 | 301 | This program is distributed in the hope that it will be useful, 302 | but WITHOUT ANY WARRANTY; without even the implied warranty of 303 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 304 | GNU General Public License for more details. 305 | 306 | You should have received a copy of the GNU General Public License along 307 | with this program; if not, write to the Free Software Foundation, Inc., 308 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 309 | 310 | Also add information on how to contact you by electronic and paper mail. 311 | 312 | If the program is interactive, make it output a short notice like this 313 | when it starts in an interactive mode: 314 | 315 | Gnomovision version 69, Copyright (C) year name of author 316 | Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 317 | This is free software, and you are welcome to redistribute it 318 | under certain conditions; type `show c' for details. 319 | 320 | The hypothetical commands `show w' and `show c' should show the appropriate 321 | parts of the General Public License. Of course, the commands you use may 322 | be called something other than `show w' and `show c'; they could even be 323 | mouse-clicks or menu items--whatever suits your program. 324 | 325 | You should also get your employer (if you work as a programmer) or your 326 | school, if any, to sign a "copyright disclaimer" for the program, if 327 | necessary. Here is a sample; alter the names: 328 | 329 | Yoyodyne, Inc., hereby disclaims all copyright interest in the program 330 | `Gnomovision' (which makes passes at compilers) written by James Hacker. 331 | 332 | {signature of Ty Coon}, 1 April 1989 333 | Ty Coon, President of Vice 334 | 335 | This General Public License does not permit incorporating your program into 336 | proprietary programs. If your program is a subroutine library, you may 337 | consider it more useful to permit linking proprietary applications with the 338 | library. If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | --------------------------------------------------------------------------------