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Index: src/__phutil_library_map__.php
===================================================================
--- src/__phutil_library_map__.php
+++ src/__phutil_library_map__.php
@@ -191,6 +191,8 @@
'PhutilLipsumContextFreeGrammar' => 'grammar/PhutilLipsumContextFreeGrammar.php',
'PhutilLock' => 'filesystem/PhutilLock.php',
'PhutilLockException' => 'filesystem/PhutilLockException.php',
+ 'PhutilLunarPhase' => 'utils/PhutilLunarPhase.php',
+ 'PhutilLunarPhaseTestCase' => 'utils/__tests__/PhutilLunarPhaseTestCase.php',
'PhutilMarkupEngine' => 'markup/PhutilMarkupEngine.php',
'PhutilMarkupTestCase' => 'markup/__tests__/PhutilMarkupTestCase.php',
'PhutilMetricsChannel' => 'channel/PhutilMetricsChannel.php',
@@ -548,6 +550,7 @@
'PhutilLexerSyntaxHighlighter' => 'PhutilSyntaxHighlighter',
'PhutilLipsumContextFreeGrammar' => 'PhutilContextFreeGrammar',
'PhutilLockException' => 'Exception',
+ 'PhutilLunarPhaseTestCase' => 'PhutilTestCase',
'PhutilMarkupTestCase' => 'PhutilTestCase',
'PhutilMetricsChannel' => 'PhutilChannelChannel',
'PhutilMissingSymbolException' => 'Exception',
Index: src/utils/PhutilLunarPhase.php
===================================================================
--- /dev/null
+++ src/utils/PhutilLunarPhase.php
@@ -0,0 +1,43 @@
+<?php
+
+/**
+ * Compute the phase of the terran moon for a given epoch.
+ *
+ * $moon = new PhutilLunarPhase(time());
+ * $moon->isFull();
+ */
+final class PhutilLunarPhase {
+
+ private $epoch;
+
+ public function __construct($epoch) {
+ $this->epoch = $epoch;
+ }
+
+ private function getPhase() {
+ // (Aug 11, 1999) A new moon.
+ $new_moon_epoch = 934354800;
+
+ // Number of seconds in the lunar phase.
+ $phase_length = 2551442.8768992;
+
+ return fmod($this->epoch - $new_moon_epoch, $phase_length) / 2551443;
+ }
+
+ public function isFull() {
+ return abs($this->getPhase() - 0.5) < 0.02;
+ }
+
+ public function isNew() {
+ return $this->getPhase() < 0.02 || $this->getPhase() > 0.98;
+ }
+
+ public function isWaxing() {
+ return $this->getPhase() < 0.5;
+ }
+
+ public function isWaning() {
+ return $this->getPhase() > 0.5;
+ }
+
+}
Index: src/utils/__tests__/PhutilLunarPhaseTestCase.php
===================================================================
--- /dev/null
+++ src/utils/__tests__/PhutilLunarPhaseTestCase.php
@@ -0,0 +1,59 @@
+<?php
+
+final class PhutilLunarPhaseTestCase extends PhutilTestCase {
+
+ public function testLunarPhases() {
+
+ // Aug 11, 1999
+ $moon = new PhutilLunarPhase(934354800);
+ $this->assertEqual(false, $moon->isFull());
+ $this->assertEqual(true, $moon->isNew());
+ $this->assertEqual(true, $moon->isWaxing());
+ $this->assertEqual(false, $moon->isWaning());
+
+ // May 22, 2005
+ $moon = new PhutilLunarPhase(1116745200);
+ $this->assertEqual(true, $moon->isFull());
+ $this->assertEqual(false, $moon->isNew());
+ $this->assertEqual(true, $moon->isWaxing());
+ $this->assertEqual(false, $moon->isWaning());
+
+ // May 23, 2005
+ $moon = new PhutilLunarPhase(1116831600);
+ $this->assertEqual(true, $moon->isFull());
+ $this->assertEqual(false, $moon->isNew());
+ $this->assertEqual(false, $moon->isWaxing());
+ $this->assertEqual(true, $moon->isWaning());
+
+ // May 30, 2005
+ $moon = new PhutilLunarPhase(1117436400);
+ $this->assertEqual(false, $moon->isFull());
+ $this->assertEqual(false, $moon->isNew());
+ $this->assertEqual(false, $moon->isWaxing());
+ $this->assertEqual(true, $moon->isWaning());
+
+ // June 05, 2005
+ $moon = new PhutilLunarPhase(1117954800);
+ $this->assertEqual(false, $moon->isFull());
+ $this->assertEqual(false, $moon->isNew());
+ $this->assertEqual(false, $moon->isWaxing());
+ $this->assertEqual(true, $moon->isWaning());
+
+ // June 06, 2005
+ $moon = new PhutilLunarPhase(1118041200);
+ $this->assertEqual(false, $moon->isFull());
+ $this->assertEqual(true, $moon->isNew());
+ $this->assertEqual(false, $moon->isWaxing());
+ $this->assertEqual(true, $moon->isWaning());
+
+ // Oct 4, 2013
+ $moon = new PhutilLunarPhase(1380897327);
+ $this->assertEqual(false, $moon->isFull());
+ $this->assertEqual(true, $moon->isNew());
+ $this->assertEqual(true, $moon->isWaxing());
+ $this->assertEqual(false, $moon->isWaning());
+
+ }
+
+
+}

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