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1 | <?php |
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2 | |||
3 | /** |
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4 | * SRFC_HistoricalDate.php |
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5 | * |
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6 | * This code is lifted from Terry Hurlbut's 'SMW_DV_HxDate.php' class; |
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7 | * that code was itself adapted from the Fourmilab Calendar Converter |
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8 | * Javascripts by John Walker, who wrote them in 1999 and released them |
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9 | * to the public domain. |
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10 | * |
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11 | * The internal value, unlike that of the standard SMW Date type, is a |
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12 | * 64-bit PHP float. The characteristic gives the days since |
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13 | * the epoch. |
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14 | * |
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15 | * Technically, the Julian calendar is valid only beginning January 1, 45 BC, |
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16 | * when Julius Caesar established it as per a formal Senatus consultum. But |
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17 | * currently this is the only calendar currently projectible to earlier times; |
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18 | * therefore Julian dates are valid for any year in the Julian Period. |
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19 | * |
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20 | * @author Terry A. Hurlbut |
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21 | * @author Yaron Koren |
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22 | */ |
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23 | class SRFCHistoricalDate { |
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24 | |||
25 | const GREGORIAN_EPOCH = 1721425.5; // equivalent to 1 AD |
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26 | |||
27 | protected $m_date; // the Julian day |
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28 | |||
29 | function create( $year, $month, $day ) { |
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0 ignored issues
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30 | if ( $year < 1582 || |
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31 | ( $year == 1582 && ( $month < 10 || ( $month == 10 && $day < 15 ) ) ) ) { |
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32 | $this->createFromJulian( $year, $month, $day ); |
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33 | } else { |
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34 | $this->createFromGregorian( $year, $month, $day ); |
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35 | } |
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36 | } |
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37 | |||
38 | static protected function leap_gregorian( $year ) { |
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39 | return ( ( $year % 4 ) == 0 ) && ( !( ( ( $year % 100 ) == 0 ) && ( ( $year % 400 ) != 0 ) ) ); |
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40 | } |
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41 | |||
42 | static protected function leap_julian( $year ) { |
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43 | return ( ( $year % 4 ) == ( ( $year > 0 ) ? 0 : 3 ) ); |
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44 | } |
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45 | |||
46 | static protected function leap_jul_greg( $year ) { |
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47 | return ( ( $year < 1582 ) ? SRFCHistoricalDate::leap_julian( $year ) : SRFCHistoricalDate::leap_gregorian( |
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48 | $year |
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49 | ) ); |
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50 | } |
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51 | |||
52 | protected function createFromGregorian( $year, $month, $day ) { |
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53 | $this->m_date = ( self::GREGORIAN_EPOCH - 1 ) + |
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54 | ( 365 * ( $year - 1 ) ) + |
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55 | floor( ( $year - 1 ) / 4 ) + |
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56 | ( -floor( ( $year - 1 ) / 100 ) ) + |
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57 | floor( ( $year - 1 ) / 400 ) + |
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58 | floor( |
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59 | ( ( ( 367 * $month ) - 362 ) / 12 ) + |
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60 | ( ( $month <= 2 ) ? 0 : |
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61 | ( SRFCHistoricalDate::leap_gregorian( $year ) ? -1 : -2 ) |
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62 | ) + $day |
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63 | ); |
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64 | } |
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65 | |||
66 | protected function createFromJulian( $year, $month, $day ) { |
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67 | |||
68 | /* Adjust negative common era years to the zero-based notation we use. */ |
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69 | if ( $year < 1 ) { |
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70 | $year++; |
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71 | } |
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72 | |||
73 | /* Algorithm as given in Meeus, Astronomical Algorithms, Chapter 7, page 61 */ |
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74 | if ( $month <= 2 ) { |
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75 | $year--; |
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76 | $month += 12; |
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77 | } |
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78 | |||
79 | $this->m_date = ( ( floor( ( 365.25 * ( $year + 4716 ) ) ) + |
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80 | floor( ( 30.6001 * ( $month + 1 ) ) ) + |
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81 | $day ) - 1524.5 ); |
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82 | } |
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83 | |||
84 | public function getDayOfWeek() { |
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85 | return ( floor( $this->m_date + 1.5 ) % 7 ); |
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86 | } |
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87 | |||
88 | static function daysInMonth( $year, $month ) { |
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89 | if ( $month == 4 || $month == 6 || $month == 9 || $month == 11 ) { |
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90 | return 30; |
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91 | } |
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92 | if ( $month == 2 ) { |
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93 | return ( SRFCHistoricalDate::leap_jul_greg( $year ) ) ? 29 : 28; |
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94 | } |
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95 | return 31; |
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96 | } |
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97 | |||
98 | } |
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99 |
Adding explicit visibility (
private
,protected
, orpublic
) is generally recommend to communicate to other developers how, and from where this method is intended to be used.