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Đổi ngày dương ra ngày âm (php code)

Written By Minh Trí Blog on Chủ Nhật, ngày 26 tháng 2 năm 2012 | 19:54

<html>
<body>

Tham khảo
<?php
function INT($d) {
 return floor($d);
}

function jdFromDate($dd, $mm, $yy) {
 $a = INT((14 - $mm) / 12);
 $y = $yy + 4800 - $a;
 $m = $mm + 12 * $a - 3;
 $jd = $dd + INT((153 * $m + 2) / 5) + 365 * $y + INT($y / 4) - INT($y / 100) + INT($y / 400) - 32045;
 if ($jd < 2299161) {
  $jd = $dd + INT((153* $m + 2)/5) + 365 * $y + INT($y / 4) - 32083;
 }
 return $jd;
}

function jdToDate($jd) {
 if ($jd > 2299160) { // After 5/10/1582, Gregorian calendar
  $a = $jd + 32044;
  $b = INT((4*$a+3)/146097);
  $c = $a - INT(($b*146097)/4);
 } else {
  $b = 0;
  $c = $jd + 32082;
 }
 $d = INT((4*$c+3)/1461);
 $e = $c - INT((1461*$d)/4);
 $m = INT((5*$e+2)/153);
 $day = $e - INT((153*$m+2)/5) + 1;
 $month = $m + 3 - 12*INT($m/10);
 $year = $b*100 + $d - 4800 + INT($m/10);
 //echo "day = $day, month = $month, year = $year\n";
 return array($day, $month, $year);
}

function getNewMoonDay($k, $timeZone) {
 $T = $k/1236.85; // Time in Julian centuries from 1900 January 0.5
 $T2 = $T * $T;
 $T3 = $T2 * $T;
 $dr = M_PI/180;
 $Jd1 = 2415020.75933 + 29.53058868*$k + 0.0001178*$T2 - 0.000000155*$T3;
 $Jd1 = $Jd1 + 0.00033*sin((166.56 + 132.87*$T - 0.009173*$T2)*$dr); // Mean new moon
 $M = 359.2242 + 29.10535608*$k - 0.0000333*$T2 - 0.00000347*$T3; // Sun's mean anomaly
 $Mpr = 306.0253 + 385.81691806*$k + 0.0107306*$T2 + 0.00001236*$T3; // Moon's mean anomaly
 $F = 21.2964 + 390.67050646*$k - 0.0016528*$T2 - 0.00000239*$T3; // Moon's argument of latitude
 $C1=(0.1734 - 0.000393*$T)*sin($M*$dr) + 0.0021*sin(2*$dr*$M);
 $C1 = $C1 - 0.4068*sin($Mpr*$dr) + 0.0161*sin($dr*2*$Mpr);
 $C1 = $C1 - 0.0004*sin($dr*3*$Mpr);
 $C1 = $C1 + 0.0104*sin($dr*2*$F) - 0.0051*sin($dr*($M+$Mpr));
 $C1 = $C1 - 0.0074*sin($dr*($M-$Mpr)) + 0.0004*sin($dr*(2*$F+$M));
 $C1 = $C1 - 0.0004*sin($dr*(2*$F-$M)) - 0.0006*sin($dr*(2*$F+$Mpr));
 $C1 = $C1 + 0.0010*sin($dr*(2*$F-$Mpr)) + 0.0005*sin($dr*(2*$Mpr+$M));
 if ($T < -11) {
  $deltat= 0.001 + 0.000839*$T + 0.0002261*$T2 - 0.00000845*$T3 - 0.000000081*$T*$T3;
 } else {
  $deltat= -0.000278 + 0.000265*$T + 0.000262*$T2;
 };
 $JdNew = $Jd1 + $C1 - $deltat;
 //echo "JdNew = $JdNew\n";
 return INT($JdNew + 0.5 + $timeZone/24);
}

function getSunLongitude($jdn, $timeZone) {
 $T = ($jdn - 2451545.5 - $timeZone/24) / 36525; // Time in Julian centuries from 2000-01-01 12:00:00 GMT
 $T2 = $T * $T;
 $dr = M_PI/180; // degree to radian
 $M = 357.52910 + 35999.05030*$T - 0.0001559*$T2 - 0.00000048*$T*$T2; // mean anomaly, degree
 $L0 = 280.46645 + 36000.76983*$T + 0.0003032*$T2; // mean longitude, degree
 $DL = (1.914600 - 0.004817*$T - 0.000014*$T2)*sin($dr*$M);
 $DL = $DL + (0.019993 - 0.000101*$T)*sin($dr*2*$M) + 0.000290*sin($dr*3*$M);
 $L = $L0 + $DL; // true longitude, degree
 //echo "\ndr = $dr, M = $M, T = $T, DL = $DL, L = $L, L0 = $L0\n";
    // obtain apparent longitude by correcting for nutation and aberration
    $omega = 125.04 - 1934.136 * T;
    $L = $L - 0.00569 - 0.00478 * Math.sin($omega * $dr);
 $L = $L*$dr;
 $L = $L - M_PI*2*(INT($L/(M_PI*2))); // Normalize to (0, 2*PI)
 return INT($L/M_PI*6);
}

function getLunarMonth11($yy, $timeZone) {
 $off = jdFromDate(31, 12, $yy) - 2415021;
 $k = INT($off / 29.530588853);
 $nm = getNewMoonDay($k, $timeZone);
 $sunLong = getSunLongitude($nm, $timeZone); // sun longitude at local midnight
 if ($sunLong >= 9) {
  $nm = getNewMoonDay($k-1, $timeZone);
 }
 return $nm;
}

function getLeapMonthOffset($a11, $timeZone) {
 $k = INT(($a11 - 2415021.076998695) / 29.530588853 + 0.5);
 $last = 0;
 $i = 1; // We start with the month following lunar month 11
 $arc = getSunLongitude(getNewMoonDay($k + $i, $timeZone), $timeZone);
 do {
  $last = $arc;
  $i = $i + 1;
  $arc = getSunLongitude(getNewMoonDay($k + $i, $timeZone), $timeZone);
 } while ($arc != $last && $i < 14);
 return $i - 1;
}

/* Comvert solar date dd/mm/yyyy to the corresponding lunar date */
function convertSolar2Lunar($dd, $mm, $yy, $timeZone) {
 $dayNumber = jdFromDate($dd, $mm, $yy);
 $k = INT(($dayNumber - 2415021.076998695) / 29.530588853);
 $monthStart = getNewMoonDay($k+1, $timeZone);
 if ($monthStart > $dayNumber) {
  $monthStart = getNewMoonDay($k, $timeZone);
 }
 $a11 = getLunarMonth11($yy, $timeZone);
 $b11 = $a11;
 if ($a11 >= $monthStart) {
  $lunarYear = $yy;
  $a11 = getLunarMonth11($yy-1, $timeZone);
 } else {
  $lunarYear = $yy+1;
  $b11 = getLunarMonth11($yy+1, $timeZone);
 }
 $lunarDay = $dayNumber - $monthStart + 1;
 $diff = INT(($monthStart - $a11)/29);
 $lunarLeap = 0;
 $lunarMonth = $diff + 11;
 if ($b11 - $a11 > 365) {
  $leapMonthDiff = getLeapMonthOffset($a11, $timeZone);
  if ($diff >= $leapMonthDiff) {
   $lunarMonth = $diff + 10;
   if ($diff == $leapMonthDiff) {
    $lunarLeap = 1;
   }
  }
 }
 if ($lunarMonth > 12) {
  $lunarMonth = $lunarMonth - 12;
 }
 if ($lunarMonth >= 11 && $diff < 4) {
  $lunarYear -= 1;
 }
 return array($lunarDay, $lunarMonth, $lunarYear, $lunarLeap);
}

/* Convert a lunar date to the corresponding solar date */
function convertLunar2Solar($lunarDay, $lunarMonth, $lunarYear, $lunarLeap, $timeZone) {
 if ($lunarMonth < 11) {
  $a11 = getLunarMonth11($lunarYear-1, $timeZone);
  $b11 = getLunarMonth11($lunarYear, $timeZone);
 } else {
  $a11 = getLunarMonth11($lunarYear, $timeZone);
  $b11 = getLunarMonth11($lunarYear+1, $timeZone);
 }
 $k = INT(0.5 + ($a11 - 2415021.076998695) / 29.530588853);
 $off = $lunarMonth - 11;
 if ($off < 0) {
  $off += 12;
 }
 if ($b11 - $a11 > 365) {
  $leapOff = getLeapMonthOffset($a11, $timeZone);
  $leapMonth = $leapOff - 2;
  if ($leapMonth < 0) {
   $leapMonth += 12;
  }
  if ($lunarLeap != 0 && $lunarMonth != $leapMonth) {
   return array(0, 0, 0);
  } else if ($lunarLeap != 0 || $off >= $leapOff) {
   $off += 1;
  }
 }
 $monthStart = getNewMoonDay($k + $off, $timeZone);
 return jdToDate($monthStart + $lunarDay - 1);
}
?>

<h3>&#272;&#7893;i ng&#224;y d&#432;&#417;ng ra ng&#224;y &#226;m</h3>

<?php
$date_array = getdate();
$dd = $_REQUEST['dd'];
$mm = $_REQUEST['mm'];
$yy = $_REQUEST['yy'];
if ($dd == 0) $dd = $date_array['mday'];
if ($mm == 0) $mm = $date_array['mon'];
if ($yy == 0) $yy = $date_array['year'];
$al = convertSolar2Lunar($dd, $mm, $yy, 7.0);

echo "<p><form action=\"\" method=\"POST\">\n";
echo "Ng&#224;y: <input name=\"dd\" size=2 value=\"$dd\">\n";
echo "Th&#225;ng: <input name=\"mm\" size=2 value=\"$mm\">\n";
echo "N&#259;m: <input name=\"yy\" size=4 value=\"$yy\">\n";
echo "<input type=\"submit\">\n";
echo "</form>\n";

echo "D&#432;&#417;ng l&#7883;ch: $dd/$mm/$yy => ";
$s = "&#194;m l&#7883;ch: $al[0]/$al[1]/$al[2]";
if ($al[3] == 1) $s = $s . " nhu&#7853;n";
echo "$s\n";
?>
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