// Enter your longitude and latitude, // (use negative longitude value for WEST), // (use negative latitude value for SOUTH) // example for Cocoa Florida $lat = 28.36; // North $long = -80.78; // West // note for date_sunrise function, // Because of daylight savings, the offset changes, so rather than static value... // set the offset to zero, then use default for date to convert final answer to your timezone // instead of SUNFUNCS_RET_STRING use SUNFUNCS_RET_TIMESTAMP and take resulting $offset = 0; date_default_timezone_set('America/New_York'); // Note that twilight is a different zenith variable: //`Zenith' is the angle that the centre of the Sun makes to a line perpendicular to the Earth's surface. // The best Overall figure for zenith is 90+(50/60) degrees for true sunrise/sunset // Civil twilight 96 degrees - Conventionally used to signify twilight // Nautical twilight 102 degrees - the point at which the horizon stops being visible at sea. // Astronical twilight at 108 degrees - the point when Sun stops being a source of any illumination. $zenith=90+50/60; $twilightzenith=96; // today time $nowTime=time(); // tomorrow time $tomorrowTime=strtotime(date("Y-m-d", $nowTime) . " +1 day"); $sunStartTimeStamp=date_sunrise($nowTime, SUNFUNCS_RET_TIMESTAMP, $lat, $long, $zenith, $offset); $sunStartTime=date("h:i", date_sunrise($nowTime, SUNFUNCS_RET_TIMESTAMP, $lat, $long, $zenith, $offset) ); $sunEndTimeStamp=date_sunset($nowTime, SUNFUNCS_RET_TIMESTAMP, $lat, $long, $zenith, $offset) ; $sunEndTime=date("h:i", date_sunset($nowTime, SUNFUNCS_RET_TIMESTAMP, $lat, $long, $zenith, $offset) ); $darkEndTimeStamp=date_sunrise($nowTime, SUNFUNCS_RET_TIMESTAMP, $lat, $long, $twilightzenith, $offset); $darkEndTime=date("h:i", date_sunrise($nowTime, SUNFUNCS_RET_TIMESTAMP, $lat, $long, $twilightzenith, $offset) ); $darkStartTimeStamp=date_sunset($nowTime, SUNFUNCS_RET_TIMESTAMP, $lat, $long, $twilightzenith, $offset); $darkStartTime=date("h:i", date_sunset($nowTime, SUNFUNCS_RET_TIMESTAMP, $lat, $long, $twilightzenith, $offset) ); // now calculate for next day... //$time2=strtotime(date("Y-m-d", time()) . " +1 day"); $sunStartTime2=date("h:i", date_sunrise($tomorrowTime, SUNFUNCS_RET_TIMESTAMP, $lat, $long, $zenith, $offset) ); $sunEndTime2=date("h:i", date_sunset($tomorrowTime, SUNFUNCS_RET_TIMESTAMP, $lat, $long, $zenith, $offset) ); $darkEndTime2=date("h:i", date_sunrise($tomorrowTime, SUNFUNCS_RET_TIMESTAMP, $lat, $long, $twilightzenith, $offset) ); $darkStartTime2=date("h:i", date_sunset($tomorrowTime, SUNFUNCS_RET_TIMESTAMP, $lat, $long, $twilightzenith, $offset) ); echo ""; // Determine time and if case today or tomorrow for display // if now is before sunrise, then show all today // if now is after sunrise but before sunset, then show sunset/dark today, dawn/sunrise tomorrow // if now is after darkhour, then show all tomorrow if ($nowTime < $sunStartTimeStamp){ // show all today not tomorrow echo "

Today, ".date("F j, Y")." - "; echo "Dawn: $darkEndTime A.M."; echo "   "; echo "Sunrise: $sunStartTime A.M."; echo "   "; echo "Sunset: $sunEndTime P.M."; echo "   "; echo "Dark: $darkStartTime P.M."; echo "

"; } elseif ($nowTime >= $darkStartTimeStamp) { // show all tomorrow echo "

Tomorrow, ".date("F j, Y",$tomorrowTime)." - "; echo "Dawn: $darkEndTime2 A.M."; echo "   "; echo "Sunrise: $sunStartTime2 A.M."; echo "   "; echo "Sunset: $sunEndTime2 P.M."; echo "   "; echo "Dark: $darkStartTime2 P.M."; echo "

"; } else { // show sunset/dusk for today and dawn/sunrise for tomorrow echo "

Today, ".date("F j, Y")." - "; echo "Sunset: $sunEndTime P.M."; echo "  "; echo "Dark: $darkStartTime P.M."; echo "
"; echo "Tomorrow, ".date("F j, Y",$tomorrowTime)." - "; echo "  "; echo "Dawn: $darkEndTime2 A.M."; echo "   "; echo "Sunrise: $sunStartTime2 A.M."; echo "

"; } echo "";