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<?php /* This script generates an .ics file for all the holidays I want in My Holiday Calendar This can be run as a cron job to create a fresh calendar every year and connected to Google as a URL subscription calendar */ date_default_timezone_set("America/Chicago"); // change "America/Chicago" if not in the central time zone $path = __DIR__ . '/'; // path to files area - must be writable by the script $year = date("Y"); // get the current year $start_year = $year - 2; // this is the starting year - start 2 years ago $end_year = $year + 5; // This is the ending year. - end 5 years from now $remove = array(); // add events you want to remove separated by commas... $remove = array("U14", "U07"); would remove Earth Day and April Fools Day // If $remove is used the events will be removed from the calendar the next time the ics file is imported. // If you use just the value "ALL"... $remove = array("ALL"); All events will be removed the next time the calendar is imported. This is an easy way to start over! // $Vstring =""; $num = 0; for($year = $start_year; $year <= $end_year; $year++){ holarray($year); // set the $holiday array values for this year // seasons($year); // uncomment this line to enable seasons // moonphases($year, false); // uncomment this line for full moons - change the boolean to true if you also want the other 3 phases foreach($holiday as $h){ // process each holiday to make a VEVENT $uid = $h[2]."-".$year."@N4MZ.COM"; // this creates a UID for event number and year. example: U03-2028@N4MZ.COM $Vstring .= vevent($h[0], $h[1], $uid, $h[3]); $num++; // keep a count of events } } // $string = "BEGIN:VCALENDAR\r\nVERSION:2.0\r\nPRODID:-//My Holiday Calendar//iCal 1.0//EN\r\nCALSCALE:GREGORIAN\r\nMETHOD:PUBLISH\r\n"; // $string .= "BEGIN:VTIMEZONE\r\nTZID:America/Chicago\r\nX-LIC-LOCATION:America/Chicago\r\nBEGIN:DAYLIGHT\r\nTZOFFSETFROM:-0600\r\nTZOFFSETTO:-0500\r\nTZNAME:CDT\r\nDTSTART:19700308T020000\r\nRRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU\r\nEND:DAYLIGHT\r\nBEGIN:STANDARD\r\nTZOFFSETFROM:-0500\r\nTZOFFSETTO:-0600\r\nTZNAME:CST\r\nDTSTART:19701101T020000\r\nRRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU\r\nEND:STANDARD\r\nEND:VTIMEZONE\r\n"; // this is not needed for holiday cal $string .= $Vstring; $string .= "END:VCALENDAR"; file_put_contents($path."My_Holiday_Calendar.ics", $string); // ics calendar file with multiple events echo "Generated ".$num." events in the file: My_Holiday_Calendar.ics<br>"; // echo $string; // uncomment this line to output the .ics data to the screen //------------------------------------------------------------------------------------------------------------- function holarray($year){ // this sets the holiday array based on the $year passed to it each time it is called global $holiday; // The array structure is Name, Description, Event Number, Unix Timestamp, Movable holiday with 1 for AL/USA and 2 for FL state holidays (2 is depreciated) // If you add an event you must give it a unique event number as it becomes part of the UID in the .ics file. // The order of the events is irrelevant. $holiday = array( array("World Amateur Radio Day", "Observance that marks the 1925 founding of the International Amateur Radio Union in Paris. The day promotes amateur radio science, highlights emergency communication capabilities, and encourages public engagement. ARRL supported!", "U00", strtotime("4/18/".$year)), array("Juneteenth", "Federal Holiday", "U01", strtotime("6/19/".$year), 1), // if it has a fifth element it is a movable friday/monday if on weekend move array("New Years Day", "Federal Holiday", "U02", strtotime("1/1/".$year), 1), array("Independence Day", "Federal Holiday", "U03", strtotime("7/4/".$year), 1), array("Rosa L. Parks Day (AL)", "State Observance in Alabama. Government offices are not closed.", "U04", strtotime("12/1/".$year)), array("Mardi Gras Starts", "Start of carnival season in the deep south.", "U05", strtotime("1/6/".$year)), array("Valentine's Day", "Observance", "U06", strtotime("2/14/".$year)), array("April Fools Day", "Observance - Ham radio use is banned on this day.", "U07", strtotime("4/1/".$year)), array("Christmas", "Federal Holiday", "U08", strtotime("12/25/".$year), 1), array("Halloween", "Observance", "U09", strtotime("10/31/".$year)), array("St. Patrick's Day", "Observance", "U10", strtotime("3/17/".$year)), array("Veteran's Day", "Federal Holiday", "U11", strtotime("11/11/".$year), 1), array("Groundhog Day", "Observance - Possum Day in Alabama", "U12", strtotime("2/2/".$year)), array("Flag Day", "Observance", "U13", strtotime("6/14/".$year)), array("Earth Day", "Observance - International", "U14", strtotime("4/22/".$year)), array("Pearl Harbor Day", "Observance - A date which will live in infamy.", "U15", strtotime("12/7/".$year)), array("Susan B. Anthony Day (FL)", "State Observance in Florida. Government offices are not closed.", "U16", strtotime("2/15/".$year), 1), array("Pascua Florida Day (FL)", "State Observance in Florida. Government offices are not closed.", "U17", strtotime("4/2/".$year), 1), array("Daylight Saving Time Starts", "Observance - Spring Forward", "U18", strtotime("second sunday of march ".$year)), array("Daylight Saving Time Ends", "Observance - Fall Back", "U19", strtotime("first sunday of november ".$year)), array("Presidents' Day", "Federal Holiday", "U20", strtotime("third monday of february ".$year)), array("Jefferson Davis Birthday (AL)", "State Holiday in Alabama. Government offices are closed.", "U21", strtotime("first monday of june ".$year)), array("Confederate Memorial Day (AL&MS)", "State Holiday in Alabama & Mississippi. Government offices are closed.", "U22", strtotime("fourth monday of april ".$year)), array("Tuskegee Airmen Day (AL)", "Observance in Alabama", "U23", strtotime("fourth thursday of march".$year)), array("Armed Forces Day", "Observance", "U24", strtotime("third saturday of may".$year)), array("The National Day of Prayer", "Observance", "U25", strtotime("first thursday of may".$year)), array("Martin Luther King Jr. Day", "Federal Holiday", "U26", strtotime("third monday of january".$year)), array("Labor Day", "Federal Holiday", "U27", strtotime("first monday of september".$year)), array("Columbus Day", "Federal Holiday", "U28", strtotime("second monday of october".$year)), array("Mother's Day", "Observance", "U29", strtotime("second sunday of may".$year)), array("Father's Day", "Observance", "U30", strtotime("third sunday of june".$year)), array("Memorial Day", "Federal Holiday", "U31", strtotime("last monday of may".$year)), array("Thanksgiving", "Federal Holiday", "U32", strtotime("fourth thursday of november".$year)), array("Lundi Gras", "Observed in the deep south, AKA Fat Monday. Mobile & Baldwin county schools are closed. Parades galore! State Holiday in Louisiana.", "U033", get_easter_datetime($year) - (47 * 86400)), array("Mardi Gras Day", "Observed in the deep south, AKA Fat Tuesday. Mobile & Baldwin county schools & offices are closed. State Holiday in Louisiana.", "U33", get_easter_datetime($year) - (46 * 86400)), array("Good Friday (LA&GA)", "Christian holiday widely observed. State holiday in Louisiana & Georgia. Government offices are closed.", "U34", get_easter_datetime($year) - (2 * 86400)), array("Easter Sunday", "Christian holiday widely observed.", "U35", get_easter_datetime($year)), array("Atlantic Hurricane Season Starts", "Observance - The Atlantic hurricane season runs from June 1 to November 30 which is when tropical or subtropical cyclones are most likely to form in the North Atlantic Ocean.", "U36", strtotime("6/1/".$year)), array("Atlantic Hurricane Season Ends", "Observance - The Atlantic hurricane season runs from June 1 to November 30 which is when tropical or subtropical cyclones are most likely to form in the North Atlantic Ocean.", "U37", strtotime("11/30/".$year)), array("Black Friday (FL&GA)", "State Holiday in Florida & Georgia. Government offices are closed.", "U38", strtotime("+1 day fourth thursday of november".$year)), array("Battle of New Orleans (LA)", "State Holiday in Louisiana. Government offices are closed.", "U39", strtotime("1/8/".$year)), array("Election Day", "Observance - Occurs on Tuesday after the first Monday in November.", "U40", strtotime("+1 day first monday of november".$year)), array("National Radio Day", "Observance - National Radio Day is celebrated annually to honor the invention of the radio and its enduring impact on mass communication, news, and entertainment.", "U41", strtotime("8/20/".$year)) ); // move federal and some state holidays to friday or monday if they occur on a weekend for($i=0; $i<count($holiday); $i++){ if(isset($holiday[$i][4])){ // if it has a 5th element it is a correctable holiday $orgDate = date('F jS', $holiday[$i][3]); if(date('D', $holiday[$i][3]) == "Sat" && $holiday[$i][4] == 1){ // only correct saturdays if this is set to 1 $holiday[$i][3] = $holiday[$i][3] - 86400; // Federal Holiday sat=fri $holiday[$i][0] = $holiday[$i][0] . " <--"; $holiday[$i][1] = $holiday[$i][1] . " <-- Observed on Friday because of the weekend occurance of {$orgDate}."; } else if(date('D', $holiday[$i][3]) == "Sun"){ $holiday[$i][3] = $holiday[$i][3] + 86400; // Federal Holiday sun=mon $holiday[$i][0] = "--> " . $holiday[$i][0]; $holiday[$i][1] = $holiday[$i][1] . " --> Observed on Monday because of the weekend occurance of {$orgDate}."; } } } } //--------- function get_easter_datetime($year) { $base = strtotime("21 March ".$year); $days = easter_days($year); return $base + ($days * 86400); // return unix timestamp for easter } //----------------- function vevent($summary, $desc, $uid, $timestamp){ // this returns a string containing a VEVENT global $remove; // $string = "BEGIN:VEVENT\r\n"; $string .= "DTSTART;VALUE=DATE:" . date('Ymd', $timestamp) . "\r\n"; $string .= "DTEND;VALUE=DATE:" . date('Ymd', $timestamp + 86400) . "\r\n"; // add one day to the start date $string .= "DTSTAMP:" . gmdate('Ymd\THis\Z') . "\r\n"; // $ptr = strpos($uid, "-"); if(isset($remove[0])){ if(in_array(substr($uid, 0, $ptr), $remove) || $remove[0] == "ALL") $string .= "STATUS:CANCELLED\r\n"; // if this is on the list to remove else $string .= "STATUS:CONFIRMED\r\n"; } else $string .= "STATUS:CONFIRMED\r\n"; $string .= "SUMMARY:" . $summary . "\r\n"; $desc = foldIcsLine($desc); // fold long description line lengths at 75 characters $string .= "DESCRIPTION:" . $desc ."\r\n"; $string .= "UID:".$uid."\r\n"; $string .= "CLASS:PUBLIC\r\n"; $string .= "TRANSP:OPAQUE\r\n"; // $string .= "END:VEVENT\r\n"; return $string; } //------------------------- function foldIcsLine($string) { // this limits the line length to 75 characters to meet the standard // Escape standard ics characters first $string = str_replace(["\r\n", "\r", "\n"], '\n', $string); $string = str_replace(['\\', ',', ';'], ['\\\\', '\,', '\;'], $string); $lines = []; $encodingPrefixLength = 12; // Adjust if your line has a prefix like "DESCRIPTION:" // Split the string into chunks of 75 bytes or less while (strlen($string) > 0) { $maxLength = 75 - $encodingPrefixLength; // Take a chunk $chunk = substr($string, 0, $maxLength); $lines[] = $chunk; $string = substr($string, strlen($chunk)); // After the first line, subsequent lines require 1 space for indentation $encodingPrefixLength = 1; } // Join lines with CRLF and a single space for continuation return implode("\r\n ", $lines); } //------------------------------- function seasons($year){ global $holiday; // access the $holiday array so we can add seasons $names = array('Spring','Summer','Autumn','Winter'); $url = "https://aa.usno.navy.mil/api/seasons?year={$year}"; // the free API returns a year of data in json format $data = file_get_contents($url); // get the data if(!$data || strpos($data, 'error')) return false; $data = json_decode($data, true); foreach($data['data'] as $ph){ if($ph['phenom'] == 'Equinox' || $ph['phenom'] == 'Solstice'){ // looking for seasons start $utc_time = $ph['year']."-".$ph['month']."-".$ph['day']." ".$ph['time'].":00"; // get the date and UTC time $date = new DateTime($utc_time, new DateTimeZone('UTC')); $ts = $date->getTimestamp(); $name = $names[(date('n', $ts) / 3) - 1]; // get the season name $holiday[] = array("{$name} Begins", "Astronomical - {$name} begins at ".date('g:ia T', $ts).".", "SE".$ts, $ts); // add to holiday array } } return true; } //------------------------------- function moonphases($year, $quarters = false){ // call with true to see all phases global $holiday; // access the $holiday array so we can add full moons $names = array('Blue','Wolf','Snow','Worm','Pink','Flower','Strawberry','Buck','Sturgeon','Corn',"Hunter's",'Beaver','Cold'); $prevName = 'Blue'; // set an initial previous name $url = "https://aa.usno.navy.mil/api/moon/phases/year?year={$year}"; // the free API returns a year of data in json format $data = file_get_contents($url); // get the data if(!$data || strpos($data, 'error')) return false; $data = json_decode($data, true); foreach($data['phasedata'] as $ph){ $utc_time = $ph['year']."-".$ph['month']."-".$ph['day']." ".$ph['time'].":00"; // get the date and UTC time $date = new DateTime($utc_time, new DateTimeZone('UTC')); $ts = $date->getTimestamp(); if($ph['phase'] == 'Full Moon'){ // looking for full moons $name = $names[date('n', $ts)]; // get the moon name if($name == $prevName) $name = $names[0]; // accounts for two moons in same month $prevName = $name; $holiday[] = array($ph['phase'], "Astronomical - The {$name} moon is full at ".date('g:ia T', $ts).".", "FM".$ts, $ts); // add to holiday array } else if($quarters){ $title = $ph['phase']; if(strpos($ph['phase'], 'Quarter')) $title .= " Moon"; $holiday[] = array($title, "Astronomical - The moon reaches ".$ph['phase']." at ".date('g:ia T', $ts).".", "FM".$ts, $ts); // add to array } } return true; } ?>