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@ -5,233 +5,245 @@
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<partintro>
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<para>
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The calendar functions are only available if you have compiled the
|
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calendar extension in dl/calendar. Read dl/README for instructions on
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using it.
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calendar extension in dl/calendar. Read dl/README for instructions
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on using it.
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</para>
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||||
<para>
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||||
The calendar extension presents a series of functions to
|
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simplify converting between different calendar formats. The
|
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intermediary or standard it is based on is the Julian Day Count.
|
||||
The Julian Day Count is a count of days starting way earlier than
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any date most people would need to track (somewhere around
|
||||
4000bc). To convert between calendar systems, you must first
|
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convert to Julian Day Count, then to the calendar system of your
|
||||
choice. Julian Day Count is very different from the Julian
|
||||
Calendar! For more information on calendar systems visit <ulink url="http://genealogy.org/~scottlee/cal-overview.html">http://genealogy.org/~scottlee/cal-overview.html</ulink>.
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Excerpts from this page are included in these instructions, and
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are in quotes.</para>
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||||
The calendar extension presents a series of functions to simplify
|
||||
converting between different calendar formats. The intermediary
|
||||
or standard it is based on is the Julian Day Count. The Julian
|
||||
Day Count is a count of days starting way earlier than any date
|
||||
most people would need to track (somewhere around 4000bc). To
|
||||
convert between calendar systems, you must first convert to Julian
|
||||
Day Count, then to the calendar system of your choice. Julian Day
|
||||
Count is very different from the Julian Calendar! For more
|
||||
information on calendar systems visit <ulink
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url="&url.calendar;">&url.calendar;</ulink>. Excerpts from this
|
||||
page are included in these instructions, and are in quotes.
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||||
</para>
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||||
</partintro>
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||||
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<refentry id="function.jdtogregorian">
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||||
<refnamediv>
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<refname>JDToGregorian</refname>
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||||
<refpurpose>Converts Julian Day Count to Gregorian date</refpurpose>
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</refnamediv>
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||||
<refsect1>
|
||||
<title>Description</title>
|
||||
<funcsynopsis>
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||||
<funcdef>string <function>jdtogregorian</function></funcdef>
|
||||
<paramdef>int <parameter>julianday</parameter></paramdef>
|
||||
</funcsynopsis>
|
||||
<para>
|
||||
Converts Julian Day Count to a string containing the
|
||||
Gregorian date in the format of "month/day/year"</para>
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</refsect1>
|
||||
</refentry>
|
||||
<refentry id="function.jdtogregorian">
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||||
<refnamediv>
|
||||
<refname>JDToGregorian</refname>
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||||
<refpurpose>Converts Julian Day Count to Gregorian date</refpurpose>
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</refnamediv>
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
<funcsynopsis>
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||||
<funcdef>string <function>jdtogregorian</function></funcdef>
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||||
<paramdef>int <parameter>julianday</parameter></paramdef>
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||||
</funcsynopsis>
|
||||
<para>
|
||||
Converts Julian Day Count to a string containing the Gregorian
|
||||
date in the format of "month/day/year".
|
||||
</para>
|
||||
</refsect1>
|
||||
</refentry>
|
||||
|
||||
<refentry id="function.gregoriantojd">
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||||
<refnamediv>
|
||||
<refname>GregorianToJD</refname>
|
||||
<refpurpose>Converts a Gregorian date to Julian Day
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||||
Count</refpurpose>
|
||||
</refnamediv>
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
<funcsynopsis>
|
||||
<funcdef>int <function>gregoriantojd</function></funcdef>
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<paramdef>int <parameter>month</parameter></paramdef>
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<paramdef>int <parameter>day</parameter></paramdef>
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||||
<paramdef>int <parameter>year</parameter></paramdef>
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</funcsynopsis>
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<para>
|
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Valid Range for Gregorian Calendar 4714 B.C. to 9999 A.D.</para>
|
||||
<para>
|
||||
Although this software can handle dates all the way back to
|
||||
4714 B.C., such use may not be meaningful. The Gregorian
|
||||
calendar was not instituted until October 15, 1582 (or
|
||||
October 5, 1582 in the Julian calendar). Some countries did
|
||||
not accept it until much later. For example, Britain
|
||||
converted in 1752, The USSR in 1918 and Greece in 1923. Most
|
||||
European countries used the Julian calendar prior to the
|
||||
Gregorian.
|
||||
|
||||
<example>
|
||||
<title>Calendar functions</title>
|
||||
<programlisting role="php">
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<refentry id="function.gregoriantojd">
|
||||
<refnamediv>
|
||||
<refname>GregorianToJD</refname>
|
||||
<refpurpose>
|
||||
Converts a Gregorian date to Julian Day Count
|
||||
</refpurpose>
|
||||
</refnamediv>
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
<funcsynopsis>
|
||||
<funcdef>int <function>gregoriantojd</function></funcdef>
|
||||
<paramdef>int <parameter>month</parameter></paramdef>
|
||||
<paramdef>int <parameter>day</parameter></paramdef>
|
||||
<paramdef>int <parameter>year</parameter></paramdef>
|
||||
</funcsynopsis>
|
||||
<para>
|
||||
Valid Range for Gregorian Calendar 4714 B.C. to 9999 A.D.</para>
|
||||
<para>
|
||||
Although this software can handle dates all the way back to 4714
|
||||
B.C., such use may not be meaningful. The Gregorian calendar was
|
||||
not instituted until October 15, 1582 (or October 5, 1582 in the
|
||||
Julian calendar). Some countries did not accept it until much
|
||||
later. For example, Britain converted in 1752, The USSR in 1918
|
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and Greece in 1923. Most European countries used the Julian
|
||||
calendar prior to the Gregorian.
|
||||
<example>
|
||||
<title>Calendar functions</title>
|
||||
<programlisting role="php">
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<?php
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$jd = GregorianToJD(10,11,1970);
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echo("$jd\n");
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$gregorian = JDToGregorian($jd);
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echo("$gregorian\n");
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$jd = GregorianToJD (10,11,1970);
|
||||
echo "$jd\n";
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||||
$gregorian = JDToGregorian ($jd);
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echo "$gregorian\n";
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?>
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</programlisting>
|
||||
</example></para>
|
||||
|
||||
</refsect1>
|
||||
</refentry>
|
||||
</programlisting>
|
||||
</example>
|
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</para>
|
||||
</refsect1>
|
||||
</refentry>
|
||||
|
||||
<refentry id="function.jdtojulian">
|
||||
<refnamediv>
|
||||
<refname>JDToJulian</refname>
|
||||
<refpurpose>Converts a Julian Calendar date to Julian Day
|
||||
Count</refpurpose>
|
||||
</refnamediv>
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
<funcsynopsis>
|
||||
<funcdef>string <function>jdtojulian</function></funcdef>
|
||||
<paramdef>int <parameter>julianday</parameter></paramdef>
|
||||
</funcsynopsis>
|
||||
<para>
|
||||
Converts Julian Day Count to a string containing the Julian
|
||||
Calendar Date in the format of "month/day/year".</para>
|
||||
</refsect1>
|
||||
</refentry>
|
||||
<refentry id="function.jdtojulian">
|
||||
<refnamediv>
|
||||
<refname>JDToJulian</refname>
|
||||
<refpurpose>
|
||||
Converts a Julian Calendar date to Julian Day Count
|
||||
</refpurpose>
|
||||
</refnamediv>
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
<funcsynopsis>
|
||||
<funcdef>string <function>jdtojulian</function></funcdef>
|
||||
<paramdef>int <parameter>julianday</parameter></paramdef>
|
||||
</funcsynopsis>
|
||||
<para>
|
||||
Converts Julian Day Count to a string containing the Julian
|
||||
Calendar Date in the format of "month/day/year".
|
||||
</para>
|
||||
</refsect1>
|
||||
</refentry>
|
||||
|
||||
<refentry id="function.juliantojd">
|
||||
<refnamediv>
|
||||
<refname>JulianToJD</refname>
|
||||
<refpurpose>Converts a Julian Calendar date to Julian Day
|
||||
Count</refpurpose>
|
||||
</refnamediv>
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
<funcsynopsis>
|
||||
<funcdef>int <function>juliantojd</function></funcdef>
|
||||
<paramdef>int <parameter>month</parameter></paramdef>
|
||||
<paramdef>int <parameter>day</parameter></paramdef>
|
||||
<paramdef>int <parameter>year</parameter></paramdef>
|
||||
</funcsynopsis>
|
||||
<para>
|
||||
Valid Range for Julian Calendar 4713 B.C. to 9999 A.D.</para>
|
||||
<para>
|
||||
Although this software can handle dates all the way back to
|
||||
4713 B.C., such use may not be meaningful. The calendar was
|
||||
created in 46 B.C., but the details did not stabilize until
|
||||
at least 8 A.D., and perhaps as late at the 4th
|
||||
century. Also, the beginning of a year varied from one
|
||||
culture to another - not all accepted January as the first
|
||||
month.</para>
|
||||
</refsect1>
|
||||
</refentry>
|
||||
<refentry id="function.juliantojd">
|
||||
<refnamediv>
|
||||
<refname>JulianToJD</refname>
|
||||
<refpurpose>
|
||||
Converts a Julian Calendar date to Julian Day Count
|
||||
</refpurpose>
|
||||
</refnamediv>
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
<funcsynopsis>
|
||||
<funcdef>int <function>juliantojd</function></funcdef>
|
||||
<paramdef>int <parameter>month</parameter></paramdef>
|
||||
<paramdef>int <parameter>day</parameter></paramdef>
|
||||
<paramdef>int <parameter>year</parameter></paramdef>
|
||||
</funcsynopsis>
|
||||
<para>
|
||||
Valid Range for Julian Calendar 4713 B.C. to 9999 A.D.
|
||||
</para>
|
||||
<para>
|
||||
Although this software can handle dates all the way back to 4713
|
||||
B.C., such use may not be meaningful. The calendar was created in
|
||||
46 B.C., but the details did not stabilize until at least 8 A.D.,
|
||||
and perhaps as late at the 4th century. Also, the beginning of a
|
||||
year varied from one culture to another - not all accepted
|
||||
January as the first month.
|
||||
</para>
|
||||
</refsect1>
|
||||
</refentry>
|
||||
|
||||
<refentry id="function.jdtojewish">
|
||||
<refnamediv>
|
||||
<refname>JDToJewish</refname>
|
||||
<refpurpose>
|
||||
Converts a Julian Day Count to the Jewish Calendar
|
||||
</refpurpose>
|
||||
</refnamediv>
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
<funcsynopsis>
|
||||
<funcdef>string <function>jdtojewish</function></funcdef>
|
||||
<paramdef>int <parameter>julianday</parameter></paramdef>
|
||||
</funcsynopsis>
|
||||
<para>
|
||||
Converts a Julian Day Count the the Jewish Calendar.
|
||||
</para>
|
||||
</refsect1>
|
||||
</refentry>
|
||||
|
||||
<refentry id="function.jdtojewish">
|
||||
<refnamediv>
|
||||
<refname>JDToJewish</refname>
|
||||
<refpurpose>Converts a Julian Day Count to the Jewish
|
||||
Calendar</refpurpose>
|
||||
</refnamediv>
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
<funcsynopsis>
|
||||
<funcdef>string <function>jdtojewish</function></funcdef>
|
||||
<paramdef>int <parameter>julianday</parameter></paramdef>
|
||||
</funcsynopsis>
|
||||
<para>
|
||||
Converts a Julian Day Count the the Jewish Calendar.</para>
|
||||
</refsect1>
|
||||
</refentry>
|
||||
|
||||
<refentry id="function.jewishtojd">
|
||||
<refnamediv>
|
||||
<refname>JewishToJD</refname>
|
||||
<refpurpose>Converts a date in the Jewish Calendar to Julian
|
||||
Day Count</refpurpose>
|
||||
</refnamediv>
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
<funcsynopsis>
|
||||
<funcdef>int <function>jewishtojd</function></funcdef>
|
||||
<paramdef>int <parameter>month</parameter></paramdef>
|
||||
<paramdef>int <parameter>day</parameter></paramdef>
|
||||
<paramdef>int <parameter>year</parameter></paramdef>
|
||||
</funcsynopsis>
|
||||
<para>
|
||||
Valid Range Although this software can handle dates all the
|
||||
way back to the year 1 (3761 B.C.), such use may not be
|
||||
meaningful.</para>
|
||||
<para>
|
||||
The Jewish calendar has been in use for several thousand
|
||||
years, but in the early days there was no formula to
|
||||
determine the start of a month. A new month was started when
|
||||
the new moon was first observed.</para>
|
||||
</refsect1>
|
||||
</refentry>
|
||||
|
||||
<refentry id="function.jdtofrench">
|
||||
<refnamediv>
|
||||
<refname>JDToFrench</refname>
|
||||
<refpurpose>Converts a Julian Day Count to the French
|
||||
Republican Calendar</refpurpose>
|
||||
</refnamediv>
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
<funcsynopsis>
|
||||
<funcdef>string <function>jdtofrench</function></funcdef>
|
||||
<paramdef>int <parameter>month</parameter></paramdef>
|
||||
<paramdef>int <parameter>day</parameter></paramdef>
|
||||
<paramdef>int <parameter>year</parameter></paramdef>
|
||||
</funcsynopsis>
|
||||
<para>
|
||||
Converts a Julian Day Count to the French Republican
|
||||
Calendar.</para>
|
||||
</refsect1>
|
||||
</refentry>
|
||||
|
||||
<refentry id="function.frenchtojd">
|
||||
<refnamediv>
|
||||
<refname>FrenchToJD</refname>
|
||||
<refpurpose>Converts a date from the French Republican
|
||||
Calendar to a Julian Day Count</refpurpose>
|
||||
</refnamediv>
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
<funcsynopsis>
|
||||
<funcdef>int <function>frenchtojd</function></funcdef>
|
||||
<paramdef>int <parameter>month</parameter></paramdef>
|
||||
<paramdef>int <parameter>day</parameter></paramdef>
|
||||
<paramdef>int <parameter>year</parameter></paramdef>
|
||||
</funcsynopsis>
|
||||
<para>
|
||||
Converts a date from the French Republican Calendar to a
|
||||
Julian Day Count</para>
|
||||
<para>
|
||||
These routines only convert dates in years 1 through 14
|
||||
(Gregorian dates 22 September 1792 through 22 September
|
||||
1806). This more than covers the period when the calendar was
|
||||
in use.</para>
|
||||
</refsect1>
|
||||
</refentry>
|
||||
|
||||
<refentry id="function.jdmonthname">
|
||||
<refnamediv>
|
||||
<refname>JDMonthName</refname>
|
||||
<refpurpose>Returns a month name</refpurpose>
|
||||
</refnamediv>
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
<funcsynopsis>
|
||||
<funcdef>string <function>jdmonthname</function></funcdef>
|
||||
<paramdef>int <parameter>julianday</parameter></paramdef>
|
||||
<paramdef>int <parameter>mode</parameter></paramdef>
|
||||
</funcsynopsis>
|
||||
<para>
|
||||
Returns a string containing a month name.
|
||||
<parameter>mode</parameter> tells this function which
|
||||
calendar to convert the Julian Day Count to, and what type of
|
||||
month names are to be returned.
|
||||
<refentry id="function.jewishtojd">
|
||||
<refnamediv>
|
||||
<refname>JewishToJD</refname>
|
||||
<refpurpose>
|
||||
Converts a date in the Jewish Calendar to Julian Day Count
|
||||
</refpurpose>
|
||||
</refnamediv>
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
<funcsynopsis>
|
||||
<funcdef>int <function>jewishtojd</function></funcdef>
|
||||
<paramdef>int <parameter>month</parameter></paramdef>
|
||||
<paramdef>int <parameter>day</parameter></paramdef>
|
||||
<paramdef>int <parameter>year</parameter></paramdef>
|
||||
</funcsynopsis>
|
||||
<para>
|
||||
Valid Range Although this software can handle dates all the way
|
||||
back to the year 1 (3761 B.C.), such use may not be meaningful.
|
||||
</para>
|
||||
<para>
|
||||
The Jewish calendar has been in use for several thousand years,
|
||||
but in the early days there was no formula to determine the start
|
||||
of a month. A new month was started when the new moon was first
|
||||
observed.
|
||||
</para>
|
||||
</refsect1>
|
||||
</refentry>
|
||||
|
||||
<refentry id="function.jdtofrench">
|
||||
<refnamediv>
|
||||
<refname>JDToFrench</refname>
|
||||
<refpurpose>
|
||||
Converts a Julian Day Count to the French Republican Calendar
|
||||
</refpurpose>
|
||||
</refnamediv>
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
<funcsynopsis>
|
||||
<funcdef>string <function>jdtofrench</function></funcdef>
|
||||
<paramdef>int <parameter>month</parameter></paramdef>
|
||||
<paramdef>int <parameter>day</parameter></paramdef>
|
||||
<paramdef>int <parameter>year</parameter></paramdef>
|
||||
</funcsynopsis>
|
||||
<para>
|
||||
Converts a Julian Day Count to the French Republican Calendar.
|
||||
</para>
|
||||
</refsect1>
|
||||
</refentry>
|
||||
|
||||
<refentry id="function.frenchtojd">
|
||||
<refnamediv>
|
||||
<refname>FrenchToJD</refname>
|
||||
<refpurpose>
|
||||
Converts a date from the French Republican Calendar to a Julian
|
||||
Day Count
|
||||
</refpurpose>
|
||||
</refnamediv>
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
<funcsynopsis>
|
||||
<funcdef>int <function>frenchtojd</function></funcdef>
|
||||
<paramdef>int <parameter>month</parameter></paramdef>
|
||||
<paramdef>int <parameter>day</parameter></paramdef>
|
||||
<paramdef>int <parameter>year</parameter></paramdef>
|
||||
</funcsynopsis>
|
||||
<para>
|
||||
Converts a date from the French Republican Calendar to a Julian
|
||||
Day Count.
|
||||
</para>
|
||||
<para>
|
||||
These routines only convert dates in years 1 through 14
|
||||
(Gregorian dates 22 September 1792 through 22 September
|
||||
1806). This more than covers the period when the calendar was in
|
||||
use.
|
||||
</para>
|
||||
</refsect1>
|
||||
</refentry>
|
||||
|
||||
<refentry id="function.jdmonthname">
|
||||
<refnamediv>
|
||||
<refname>JDMonthName</refname>
|
||||
<refpurpose>Returns a month name</refpurpose>
|
||||
</refnamediv>
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
<funcsynopsis>
|
||||
<funcdef>string <function>jdmonthname</function></funcdef>
|
||||
<paramdef>int <parameter>julianday</parameter></paramdef>
|
||||
<paramdef>int <parameter>mode</parameter></paramdef>
|
||||
</funcsynopsis>
|
||||
<para>
|
||||
Returns a string containing a month name.
|
||||
<parameter>mode</parameter> tells this function which calendar to
|
||||
convert the Julian Day Count to, and what type of month names are
|
||||
to be returned.
|
||||
<table>
|
||||
<title>Calendar modes</title>
|
||||
<tgroup cols="2">
|
||||
|
@ -244,7 +256,7 @@ echo("$gregorian\n");
|
|||
<tbody>
|
||||
<row>
|
||||
<entry>0</entry>
|
||||
<entry>Gregorian - apreviated</entry>
|
||||
<entry>Gregorian - abbreviated</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>1</entry>
|
||||
|
@ -252,7 +264,7 @@ echo("$gregorian\n");
|
|||
</row>
|
||||
<row>
|
||||
<entry>2</entry>
|
||||
<entry>Julian - apreviated</entry>
|
||||
<entry>Julian - abbreviated</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>3</entry>
|
||||
|
@ -268,27 +280,26 @@ echo("$gregorian\n");
|
|||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</table></para>
|
||||
|
||||
</refsect1>
|
||||
</refentry>
|
||||
|
||||
<refentry id="function.jddayofweek">
|
||||
<refnamediv>
|
||||
<refname>JDDayOfWeek</refname>
|
||||
<refpurpose>Returns the day of the week</refpurpose>
|
||||
</refnamediv>
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
<funcsynopsis>
|
||||
<funcdef>mixed <function>jddayofweek</function></funcdef>
|
||||
<paramdef>int <parameter>julianday</parameter></paramdef>
|
||||
<paramdef>int <parameter>mode</parameter></paramdef>
|
||||
</funcsynopsis>
|
||||
<para>
|
||||
Returns the day of the week. Can return a string or an int
|
||||
depending on the mode.
|
||||
</table>
|
||||
</para>
|
||||
</refsect1>
|
||||
</refentry>
|
||||
|
||||
<refentry id="function.jddayofweek">
|
||||
<refnamediv>
|
||||
<refname>JDDayOfWeek</refname>
|
||||
<refpurpose>Returns the day of the week</refpurpose>
|
||||
</refnamediv>
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
<funcsynopsis>
|
||||
<funcdef>mixed <function>jddayofweek</function></funcdef>
|
||||
<paramdef>int <parameter>julianday</parameter></paramdef>
|
||||
<paramdef>int <parameter>mode</parameter></paramdef>
|
||||
</funcsynopsis>
|
||||
<para>
|
||||
Returns the day of the week. Can return a string or an int
|
||||
depending on the mode.
|
||||
<table>
|
||||
<title>Calendar week modes</title>
|
||||
<tgroup cols="2">
|
||||
|
@ -300,28 +311,38 @@ echo("$gregorian\n");
|
|||
</thead>
|
||||
<tbody>
|
||||
<row>
|
||||
<entry>0</entry> <entry>returns the day number as an int
|
||||
(0=sunday, 1=monday, etc)</entry>
|
||||
<entry>0</entry>
|
||||
<entry>
|
||||
Returns the day number as an int (0=sunday, 1=monday, etc)
|
||||
</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>1</entry> <entry>returns string containing the day of
|
||||
week (english-gregorian)</entry>
|
||||
<entry>1</entry>
|
||||
<entry>
|
||||
Returns string containing the day of week
|
||||
(english-gregorian)
|
||||
</entry>
|
||||
</row>
|
||||
<row>
|
||||
<entry>2</entry> <entry>returns a string containing the
|
||||
abreviated day of week (english-gregorian)</entry>
|
||||
<entry>2</entry>
|
||||
<entry>
|
||||
Returns a string containing the abbreviated day of week
|
||||
(english-gregorian)
|
||||
</entry>
|
||||
</row>
|
||||
</tbody>
|
||||
</tgroup>
|
||||
</table></para>
|
||||
|
||||
</refsect1>
|
||||
</refentry>
|
||||
</table>
|
||||
</para>
|
||||
</refsect1>
|
||||
</refentry>
|
||||
|
||||
<refentry id="function.easter-date">
|
||||
<refnamediv>
|
||||
<refname>easter_date</refname>
|
||||
<refpurpose>get UNIX timestamp for midnight on Easter of a given year</refpurpose>
|
||||
<refpurpose>
|
||||
Get UNIX timestamp for midnight on Easter of a given year
|
||||
</refpurpose>
|
||||
</refnamediv>
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
|
@ -330,9 +351,9 @@ echo("$gregorian\n");
|
|||
<paramdef>int <parameter>year</parameter></paramdef>
|
||||
</funcsynopsis>
|
||||
<para>
|
||||
Returns the UNIX timestamp corresponding to midnight on
|
||||
Easter of the given year. If no year is specified, the
|
||||
current year is assumed.
|
||||
Returns the UNIX timestamp corresponding to midnight on Easter of
|
||||
the given year. If no year is specified, the current year is
|
||||
assumed.
|
||||
</para>
|
||||
<para>
|
||||
<emphasis>Warning:</emphasis> This function will generate
|
||||
|
@ -340,27 +361,26 @@ echo("$gregorian\n");
|
|||
timestamps (i.e. before 1970 or after 2037).
|
||||
<example>
|
||||
<title><function>easter_date</function> example</title>
|
||||
<programlisting>
|
||||
echo date( "M-d-Y", easter_date(1999) ); /* "Apr-04-1999" */
|
||||
echo date( "M-d-Y", easter_date(2000) ); /* "Apr-23-2000" */
|
||||
echo date( "M-d-Y", easter_date(2001) ); /* "Apr-15-2001" */
|
||||
</programlisting>
|
||||
<programlisting role="php">
|
||||
echo date ("M-d-Y", easter_date(1999)); /* "Apr-04-1999" */
|
||||
echo date ("M-d-Y", easter_date(2000)); /* "Apr-23-2000" */
|
||||
echo date ("M-d-Y", easter_date(2001)); /* "Apr-15-2001" */
|
||||
</programlisting>
|
||||
</example>
|
||||
</para>
|
||||
<para>
|
||||
The date of Easter Day was defined by the Council of
|
||||
Nicaea in AD325 as the Sunday after the first full moon
|
||||
which falls on or after the Spring Equinox. The
|
||||
Equinox is assumed to always fall on 21st March, so the
|
||||
calculation reduces to determining the date of the full
|
||||
moon and the date of the following Sunday. The algorithm
|
||||
used here was introduced around the year 532 by Dionysius
|
||||
Exiguus. Under the Julian Calendar (for years before 1753)
|
||||
a simple 19-year cycle is used to track the phases of the Moon.
|
||||
Under the Gregorian Calendar (for years after 1753 - devised
|
||||
by Clavius and Lilius, and introduced by Pope Gregory XIII
|
||||
in October 1582, and into Britain and its then colonies in
|
||||
September 1752) two correction factors are added to make the
|
||||
The date of Easter Day was defined by the Council of Nicaea in
|
||||
AD325 as the Sunday after the first full moon which falls on or
|
||||
after the Spring Equinox. The Equinox is assumed to always fall
|
||||
on 21st March, so the calculation reduces to determining the date
|
||||
of the full moon and the date of the following Sunday. The
|
||||
algorithm used here was introduced around the year 532 by
|
||||
Dionysius Exiguus. Under the Julian Calendar (for years before
|
||||
1753) a simple 19-year cycle is used to track the phases of the
|
||||
Moon. Under the Gregorian Calendar (for years after 1753 -
|
||||
devised by Clavius and Lilius, and introduced by Pope Gregory
|
||||
XIII in October 1582, and into Britain and its then colonies in
|
||||
September 1752) two correction factors are added to make the
|
||||
cycle more accurate.
|
||||
</para>
|
||||
<para>
|
||||
|
@ -377,7 +397,10 @@ echo date( "M-d-Y", easter_date(2001) ); /* "Apr-15-2001" */
|
|||
<refentry id="function.easter-days">
|
||||
<refnamediv>
|
||||
<refname>easter_days</refname>
|
||||
<refpurpose>get number of days after March 21 on which Easter falls for a given year</refpurpose>
|
||||
<refpurpose>
|
||||
Get number of days after March 21 on which Easter falls for a
|
||||
given year
|
||||
</refpurpose>
|
||||
</refnamediv>
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
|
@ -387,35 +410,36 @@ echo date( "M-d-Y", easter_date(2001) ); /* "Apr-15-2001" */
|
|||
</funcsynopsis>
|
||||
<para>
|
||||
Returns the number of days after March 21 on which Easter falls
|
||||
for a given year. If no year is specified, the current year is assumed.
|
||||
for a given year. If no year is specified, the current year is
|
||||
assumed.
|
||||
</para>
|
||||
<para>
|
||||
This function can be used instead of <function>easter_date</function>
|
||||
to calculate Easter for years which fall outside the range of UNIX
|
||||
timestamps (i.e. before 1970 or after 2037).
|
||||
This function can be used instead of
|
||||
<function>easter_date</function> to calculate Easter for years
|
||||
which fall outside the range of UNIX timestamps (i.e. before 1970
|
||||
or after 2037).
|
||||
<example>
|
||||
<title><function>easter_date</function> example</title>
|
||||
<programlisting>
|
||||
echo easter_days(1999); /* 14, i.e. April 4 */
|
||||
echo easter_days(1492); /* 32, i.e. April 22 */
|
||||
echo easter_days(1913); /* 2, i.e. March 23 */
|
||||
</programlisting>
|
||||
<title><function>Easter_date</function> example</title>
|
||||
<programlisting role="php">
|
||||
echo easter_days (1999); /* 14, i.e. April 4 */
|
||||
echo easter_days (1492); /* 32, i.e. April 22 */
|
||||
echo easter_days (1913); /* 2, i.e. March 23 */
|
||||
</programlisting>
|
||||
</example>
|
||||
</para>
|
||||
<para>
|
||||
The date of Easter Day was defined by the Council of
|
||||
Nicaea in AD325 as the Sunday after the first full moon
|
||||
which falls on or after the Spring Equinox. The
|
||||
Equinox is assumed to always fall on 21st March, so the
|
||||
calculation reduces to determining the date of the full
|
||||
moon and the date of the following Sunday. The algorithm
|
||||
used here was introduced around the year 532 by Dionysius
|
||||
Exiguus. Under the Julian Calendar (for years before 1753)
|
||||
a simple 19-year cycle is used to track the phases of the Moon.
|
||||
Under the Gregorian Calendar (for years after 1753 - devised
|
||||
by Clavius and Lilius, and introduced by Pope Gregory XIII
|
||||
in October 1582, and into Britain and its then colonies in
|
||||
September 1752) two correction factors are added to make the
|
||||
The date of Easter Day was defined by the Council of Nicaea in
|
||||
AD325 as the Sunday after the first full moon which falls on or
|
||||
after the Spring Equinox. The Equinox is assumed to always fall
|
||||
on 21st March, so the calculation reduces to determining the date
|
||||
of the full moon and the date of the following Sunday. The
|
||||
algorithm used here was introduced around the year 532 by
|
||||
Dionysius Exiguus. Under the Julian Calendar (for years before
|
||||
1753) a simple 19-year cycle is used to track the phases of the
|
||||
Moon. Under the Gregorian Calendar (for years after 1753 -
|
||||
devised by Clavius and Lilius, and introduced by Pope Gregory
|
||||
XIII in October 1582, and into Britain and its then colonies in
|
||||
September 1752) two correction factors are added to make the
|
||||
cycle more accurate.
|
||||
</para>
|
||||
<para>
|
||||
|
@ -437,20 +461,23 @@ echo easter_days(1913); /* 2, i.e. March 23 */
|
|||
<title>Description</title>
|
||||
<funcsynopsis>
|
||||
<funcdef>int <function>unixtojd</function></funcdef>
|
||||
<paramdef>int <parameter><optional>timestamp</optional></parameter></paramdef>
|
||||
<paramdef>int
|
||||
<parameter><optional>timestamp</optional></parameter>
|
||||
</paramdef>
|
||||
</funcsynopsis>
|
||||
<para>
|
||||
Return the Julian Day for a UNIX <parameter>timestamp</parameter>
|
||||
(seconds since 1.1.1970), or for the current day if no
|
||||
Return the Julian Day for a UNIX <parameter>timestamp</parameter>
|
||||
(seconds since 1.1.1970), or for the current day if no
|
||||
<parameter>timestamp</parameter> is given.
|
||||
</para>
|
||||
<para>
|
||||
See also <function>jdtounix</function>.
|
||||
</para>
|
||||
<para>
|
||||
This function is only available in PHP versions
|
||||
after PHP4RC1.
|
||||
</para>
|
||||
<note>
|
||||
<para>
|
||||
This function is only available in PHP versions after PHP4RC1.
|
||||
</para>
|
||||
</note>
|
||||
</refsect1>
|
||||
</refentry>
|
||||
|
||||
|
@ -466,19 +493,20 @@ echo easter_days(1913); /* 2, i.e. March 23 */
|
|||
<paramdef>int <parameter>jday</parameter></paramdef>
|
||||
</funcsynopsis>
|
||||
<para>
|
||||
This function will return a UNIX timestamp corresponding
|
||||
to the Julian Day given in <parameter>jday</parameter>
|
||||
or false if <parameter>jday</parameter> is not inside
|
||||
the UNIX epoch (Gregorian years between 1970 and 2037 or
|
||||
2440588 <= <parameter>jday</parameter> <= 2465342 )
|
||||
This function will return a UNIX timestamp corresponding to the
|
||||
Julian Day given in <parameter>jday</parameter> or false if
|
||||
<parameter>jday</parameter> is not inside the UNIX epoch
|
||||
(Gregorian years between 1970 and 2037 or 2440588 <=
|
||||
<parameter>jday</parameter> <= 2465342 )
|
||||
</para>
|
||||
<para>
|
||||
See also <function>jdtounix</function>.
|
||||
</para>
|
||||
<para>
|
||||
This function is only available in PHP versions
|
||||
after PHP4RC1.
|
||||
</para>
|
||||
<note>
|
||||
<para>
|
||||
This function is only available in PHP versions after PHP4RC1.
|
||||
</para>
|
||||
</note>
|
||||
</refsect1>
|
||||
</refentry>
|
||||
|
||||
|
@ -494,7 +522,7 @@ sgml-always-quote-attributes:t
|
|||
sgml-indent-step:1
|
||||
sgml-indent-data:t
|
||||
sgml-parent-document:nil
|
||||
sgml-default-dtd-file:"../manual.ced"
|
||||
sgml-default-dtd-file:"../../manual.ced"
|
||||
sgml-exposed-tags:nil
|
||||
sgml-local-catalogs:nil
|
||||
sgml-local-ecat-files:nil
|
||||
|
|
Loading…
Reference in a new issue