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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>GTimeZone: GLib Reference Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="GLib Reference Manual"> <link rel="up" href="glib-utilities.html" title="GLib Utilities"> <link rel="prev" href="glib-Date-and-Time-Functions.html" title="Date and Time Functions"> <link rel="next" href="glib-GDateTime.html" title="GDateTime"> <meta name="generator" content="GTK-Doc V1.32 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> <td width="100%" align="left" class="shortcuts"> <a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> <a href="#glib-GTimeZone.description" class="shortcut">Description</a></span> </td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="glib-utilities.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="glib-Date-and-Time-Functions.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="glib-GDateTime.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="refentry"> <a name="glib-GTimeZone"></a><div class="titlepage"></div> <div class="refnamediv"><table width="100%"><tr> <td valign="top"> <h2><span class="refentrytitle"><a name="glib-GTimeZone.top_of_page"></a>GTimeZone</span></h2> <p>GTimeZone — a structure representing a time zone</p> </td> <td class="gallery_image" valign="top" align="right"></td> </tr></table></div> <div class="refsect1"> <a name="glib-GTimeZone.functions"></a><h2>Functions</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="functions_proto_type"> <col class="functions_proto_name"> </colgroup> <tbody> <tr> <td class="function_type"> <span class="returnvalue">void</span> </td> <td class="function_name"> <a class="link" href="glib-GTimeZone.html#g-time-zone-unref" title="g_time_zone_unref ()">g_time_zone_unref</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="returnvalue">GTimeZone</span></a> * </td> <td class="function_name"> <a class="link" href="glib-GTimeZone.html#g-time-zone-ref" title="g_time_zone_ref ()">g_time_zone_ref</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="returnvalue">GTimeZone</span></a> * </td> <td class="function_name"> <a class="link" href="glib-GTimeZone.html#g-time-zone-new" title="g_time_zone_new ()">g_time_zone_new</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="returnvalue">GTimeZone</span></a> * </td> <td class="function_name"> <a class="link" href="glib-GTimeZone.html#g-time-zone-new-local" title="g_time_zone_new_local ()">g_time_zone_new_local</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="returnvalue">GTimeZone</span></a> * </td> <td class="function_name"> <a class="link" href="glib-GTimeZone.html#g-time-zone-new-utc" title="g_time_zone_new_utc ()">g_time_zone_new_utc</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="returnvalue">GTimeZone</span></a> * </td> <td class="function_name"> <a class="link" href="glib-GTimeZone.html#g-time-zone-new-offset" title="g_time_zone_new_offset ()">g_time_zone_new_offset</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gint" title="gint"><span class="returnvalue">gint</span></a> </td> <td class="function_name"> <a class="link" href="glib-GTimeZone.html#g-time-zone-find-interval" title="g_time_zone_find_interval ()">g_time_zone_find_interval</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gint" title="gint"><span class="returnvalue">gint</span></a> </td> <td class="function_name"> <a class="link" href="glib-GTimeZone.html#g-time-zone-adjust-time" title="g_time_zone_adjust_time ()">g_time_zone_adjust_time</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type">const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * </td> <td class="function_name"> <a class="link" href="glib-GTimeZone.html#g-time-zone-get-identifier" title="g_time_zone_get_identifier ()">g_time_zone_get_identifier</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type">const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * </td> <td class="function_name"> <a class="link" href="glib-GTimeZone.html#g-time-zone-get-abbreviation" title="g_time_zone_get_abbreviation ()">g_time_zone_get_abbreviation</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gint32" title="gint32"><span class="returnvalue">gint32</span></a> </td> <td class="function_name"> <a class="link" href="glib-GTimeZone.html#g-time-zone-get-offset" title="g_time_zone_get_offset ()">g_time_zone_get_offset</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> </td> <td class="function_name"> <a class="link" href="glib-GTimeZone.html#g-time-zone-is-dst" title="g_time_zone_is_dst ()">g_time_zone_is_dst</a> <span class="c_punctuation">()</span> </td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="glib-GTimeZone.other"></a><h2>Types and Values</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="other_proto_type"> <col class="other_proto_name"> </colgroup> <tbody> <tr> <td class="datatype_keyword"> </td> <td class="function_name"><a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone">GTimeZone</a></td> </tr> <tr> <td class="datatype_keyword">enum</td> <td class="function_name"><a class="link" href="glib-GTimeZone.html#GTimeType" title="enum GTimeType">GTimeType</a></td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="glib-GTimeZone.includes"></a><h2>Includes</h2> <pre class="synopsis">#include <glib.h> #include <glib/gprintf.h> </pre> </div> <div class="refsect1"> <a name="glib-GTimeZone.description"></a><h2>Description</h2> <p><a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a> is a structure that represents a time zone, at no particular point in time. It is refcounted and immutable.</p> <p>Each time zone has an identifier (for example, ‘Europe/London’) which is platform dependent. See <a class="link" href="glib-GTimeZone.html#g-time-zone-new" title="g_time_zone_new ()"><code class="function">g_time_zone_new()</code></a> for information on the identifier formats. The identifier of a time zone can be retrieved using <a class="link" href="glib-GTimeZone.html#g-time-zone-get-identifier" title="g_time_zone_get_identifier ()"><code class="function">g_time_zone_get_identifier()</code></a>.</p> <p>A time zone contains a number of intervals. Each interval has an abbreviation to describe it (for example, ‘PDT’), an offet to UTC and a flag indicating if the daylight savings time is in effect during that interval. A time zone always has at least one interval — interval 0. Note that interval abbreviations are not the same as time zone identifiers (apart from ‘UTC’), and cannot be passed to <a class="link" href="glib-GTimeZone.html#g-time-zone-new" title="g_time_zone_new ()"><code class="function">g_time_zone_new()</code></a>.</p> <p>Every UTC time is contained within exactly one interval, but a given local time may be contained within zero, one or two intervals (due to incontinuities associated with daylight savings time).</p> <p>An interval may refer to a specific period of time (eg: the duration of daylight savings time during 2010) or it may refer to many periods of time that share the same properties (eg: all periods of daylight savings time). It is also possible (usually for political reasons) that some properties (like the abbreviation) change between intervals without other properties changing.</p> <p><a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a> is available since GLib 2.26.</p> </div> <div class="refsect1"> <a name="glib-GTimeZone.functions_details"></a><h2>Functions</h2> <div class="refsect2"> <a name="g-time-zone-unref"></a><h3>g_time_zone_unref ()</h3> <pre class="programlisting"><span class="returnvalue">void</span> g_time_zone_unref (<em class="parameter"><code><a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a> *tz</code></em>);</pre> <p>Decreases the reference count on <em class="parameter"><code>tz</code></em> .</p> <div class="refsect3"> <a name="g-time-zone-unref.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>tz</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p> </div> <hr> <div class="refsect2"> <a name="g-time-zone-ref"></a><h3>g_time_zone_ref ()</h3> <pre class="programlisting"><a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="returnvalue">GTimeZone</span></a> * g_time_zone_ref (<em class="parameter"><code><a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a> *tz</code></em>);</pre> <p>Increases the reference count on <em class="parameter"><code>tz</code></em> .</p> <div class="refsect3"> <a name="g-time-zone-ref.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>tz</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-time-zone-ref.returns"></a><h4>Returns</h4> <p> a new reference to <em class="parameter"><code>tz</code></em> .</p> </div> <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p> </div> <hr> <div class="refsect2"> <a name="g-time-zone-new"></a><h3>g_time_zone_new ()</h3> <pre class="programlisting"><a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="returnvalue">GTimeZone</span></a> * g_time_zone_new (<em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *identifier</code></em>);</pre> <p>Creates a <a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a> corresponding to <em class="parameter"><code>identifier</code></em> .</p> <p><em class="parameter"><code>identifier</code></em> can either be an RFC3339/ISO 8601 time offset or something that would pass as a valid value for the <code class="literal">TZ</code> environment variable (including <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>).</p> <p>In Windows, <em class="parameter"><code>identifier</code></em> can also be the unlocalized name of a time zone for standard time, for example "Pacific Standard Time".</p> <p>Valid RFC3339 time offsets are <code class="literal">"Z"</code> (for UTC) or <code class="literal">"±hh:mm"</code>. ISO 8601 additionally specifies <code class="literal">"±hhmm"</code> and <code class="literal">"±hh"</code>. Offsets are time values to be added to Coordinated Universal Time (UTC) to get the local time.</p> <p>In UNIX, the <code class="literal">TZ</code> environment variable typically corresponds to the name of a file in the zoneinfo database, an absolute path to a file somewhere else, or a string in "std offset [dst [offset],start[/time],end[/time]]" (POSIX) format. There are no spaces in the specification. The name of standard and daylight savings time zone must be three or more alphabetic characters. Offsets are time values to be added to local time to get Coordinated Universal Time (UTC) and should be <code class="literal">"[±]hh[[:]mm[:ss]]"</code>. Dates are either <code class="literal">"Jn"</code> (Julian day with n between 1 and 365, leap years not counted), <code class="literal">"n"</code> (zero-based Julian day with n between 0 and 365) or <code class="literal">"Mm.w.d"</code> (day d (0 <= d <= 6) of week w (1 <= w <= 5) of month m (1 <= m <= 12), day 0 is a Sunday). Times are in local wall clock time, the default is 02:00:00.</p> <p>In Windows, the "tzn[+|–]hh[:mm[:ss]][dzn]" format is used, but also accepts POSIX format. The Windows format uses US rules for all time zones; daylight savings time is 60 minutes behind the standard time with date and time of change taken from Pacific Standard Time. Offsets are time values to be added to the local time to get Coordinated Universal Time (UTC).</p> <p>g_time_zone_new_local() calls this function with the value of the <code class="literal">TZ</code> environment variable. This function itself is independent of the value of <code class="literal">TZ</code>, but if <em class="parameter"><code>identifier</code></em> is <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> then <code class="literal">/etc/localtime</code> will be consulted to discover the correct time zone on UNIX and the registry will be consulted or <code class="function">GetTimeZoneInformation()</code> will be used to get the local time zone on Windows.</p> <p>If intervals are not available, only time zone rules from <code class="literal">TZ</code> environment variable or other means, then they will be computed from year 1900 to 2037. If the maximum year for the rules is available and it is greater than 2037, then it will followed instead.</p> <p>See <a class="ulink" href="http://tools.ietf.org/html/rfc3339#section-5.6" target="_top">RFC3339 §5.6</a> for a precise definition of valid RFC3339 time offsets (the <code class="literal">time-offset</code> expansion) and ISO 8601 for the full list of valid time offsets. See <a class="ulink" href="http://www.gnu.org/s/libc/manual/html_node/TZ-Variable.html" target="_top">The GNU C Library manual</a> for an explanation of the possible values of the <code class="literal">TZ</code> environment variable. See <a class="ulink" href="http://msdn.microsoft.com/en-us/library/ms912391%28v=winembedded.11%29.aspx" target="_top">Microsoft Time Zone Index Values</a> for the list of time zones on Windows.</p> <p>You should release the return value by calling <a class="link" href="glib-GTimeZone.html#g-time-zone-unref" title="g_time_zone_unref ()"><code class="function">g_time_zone_unref()</code></a> when you are done with it.</p> <div class="refsect3"> <a name="g-time-zone-new.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>identifier</p></td> <td class="parameter_description"><p>a timezone identifier. </p></td> <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-time-zone-new.returns"></a><h4>Returns</h4> <p> the requested timezone</p> </div> <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p> </div> <hr> <div class="refsect2"> <a name="g-time-zone-new-local"></a><h3>g_time_zone_new_local ()</h3> <pre class="programlisting"><a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="returnvalue">GTimeZone</span></a> * g_time_zone_new_local (<em class="parameter"><code><span class="type">void</span></code></em>);</pre> <p>Creates a <a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a> corresponding to local time. The local time zone may change between invocations to this function; for example, if the system administrator changes it.</p> <p>This is equivalent to calling <a class="link" href="glib-GTimeZone.html#g-time-zone-new" title="g_time_zone_new ()"><code class="function">g_time_zone_new()</code></a> with the value of the <code class="literal">TZ</code> environment variable (including the possibility of <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>).</p> <p>You should release the return value by calling <a class="link" href="glib-GTimeZone.html#g-time-zone-unref" title="g_time_zone_unref ()"><code class="function">g_time_zone_unref()</code></a> when you are done with it.</p> <div class="refsect3"> <a name="g-time-zone-new-local.returns"></a><h4>Returns</h4> <p> the local timezone</p> </div> <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p> </div> <hr> <div class="refsect2"> <a name="g-time-zone-new-utc"></a><h3>g_time_zone_new_utc ()</h3> <pre class="programlisting"><a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="returnvalue">GTimeZone</span></a> * g_time_zone_new_utc (<em class="parameter"><code><span class="type">void</span></code></em>);</pre> <p>Creates a <a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a> corresponding to UTC.</p> <p>This is equivalent to calling <a class="link" href="glib-GTimeZone.html#g-time-zone-new" title="g_time_zone_new ()"><code class="function">g_time_zone_new()</code></a> with a value like "Z", "UTC", "+00", etc.</p> <p>You should release the return value by calling <a class="link" href="glib-GTimeZone.html#g-time-zone-unref" title="g_time_zone_unref ()"><code class="function">g_time_zone_unref()</code></a> when you are done with it.</p> <div class="refsect3"> <a name="g-time-zone-new-utc.returns"></a><h4>Returns</h4> <p> the universal timezone</p> </div> <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p> </div> <hr> <div class="refsect2"> <a name="g-time-zone-new-offset"></a><h3>g_time_zone_new_offset ()</h3> <pre class="programlisting"><a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="returnvalue">GTimeZone</span></a> * g_time_zone_new_offset (<em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint32" title="gint32"><span class="type">gint32</span></a> seconds</code></em>);</pre> <p>Creates a <a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a> corresponding to the given constant offset from UTC, in seconds.</p> <p>This is equivalent to calling <a class="link" href="glib-GTimeZone.html#g-time-zone-new" title="g_time_zone_new ()"><code class="function">g_time_zone_new()</code></a> with a string in the form <code class="literal">[+|-]hh[:mm[:ss]]</code>.</p> <div class="refsect3"> <a name="g-time-zone-new-offset.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>seconds</p></td> <td class="parameter_description"><p>offset to UTC, in seconds</p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-time-zone-new-offset.returns"></a><h4>Returns</h4> <p>a timezone at the given offset from UTC. </p> <p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p> </div> <p class="since">Since: <a class="link" href="api-index-2-58.html#api-index-2.58">2.58</a></p> </div> <hr> <div class="refsect2"> <a name="g-time-zone-find-interval"></a><h3>g_time_zone_find_interval ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint"><span class="returnvalue">gint</span></a> g_time_zone_find_interval (<em class="parameter"><code><a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a> *tz</code></em>, <em class="parameter"><code><a class="link" href="glib-GTimeZone.html#GTimeType" title="enum GTimeType"><span class="type">GTimeType</span></a> type</code></em>, <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint64" title="gint64"><span class="type">gint64</span></a> time_</code></em>);</pre> <p>Finds an interval within <em class="parameter"><code>tz</code></em> that corresponds to the given <em class="parameter"><code>time_</code></em> . The meaning of <em class="parameter"><code>time_</code></em> depends on <em class="parameter"><code>type</code></em> .</p> <p>If <em class="parameter"><code>type</code></em> is <a class="link" href="glib-GTimeZone.html#G-TIME-TYPE-UNIVERSAL:CAPS"><code class="literal">G_TIME_TYPE_UNIVERSAL</code></a> then this function will always succeed (since universal time is monotonic and continuous).</p> <p>Otherwise <em class="parameter"><code>time_</code></em> is treated as local time. The distinction between <a class="link" href="glib-GTimeZone.html#G-TIME-TYPE-STANDARD:CAPS"><code class="literal">G_TIME_TYPE_STANDARD</code></a> and <a class="link" href="glib-GTimeZone.html#G-TIME-TYPE-DAYLIGHT:CAPS"><code class="literal">G_TIME_TYPE_DAYLIGHT</code></a> is ignored except in the case that the given <em class="parameter"><code>time_</code></em> is ambiguous. In Toronto, for example, 01:30 on November 7th 2010 occurred twice (once inside of daylight savings time and the next, an hour later, outside of daylight savings time). In this case, the different value of <em class="parameter"><code>type</code></em> would result in a different interval being returned.</p> <p>It is still possible for this function to fail. In Toronto, for example, 02:00 on March 14th 2010 does not exist (due to the leap forward to begin daylight savings time). -1 is returned in that case.</p> <div class="refsect3"> <a name="g-time-zone-find-interval.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>tz</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a></p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>the <a class="link" href="glib-GTimeZone.html#GTimeType" title="enum GTimeType"><span class="type">GTimeType</span></a> of <em class="parameter"><code>time_</code></em> </p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>time_</p></td> <td class="parameter_description"><p>a number of seconds since January 1, 1970</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="g-time-zone-find-interval.returns"></a><h4>Returns</h4> <p> the interval containing <em class="parameter"><code>time_</code></em> , or -1 in case of failure</p> </div> <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p> </div> <hr> <div class="refsect2"> <a name="g-time-zone-adjust-time"></a><h3>g_time_zone_adjust_time ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint" title="gint"><span class="returnvalue">gint</span></a> g_time_zone_adjust_time (<em class="parameter"><code><a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a> *tz</code></em>, <em class="parameter"><code><a class="link" href="glib-GTimeZone.html#GTimeType" title="enum GTimeType"><span class="type">GTimeType</span></a> type</code></em>, <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint64" title="gint64"><span class="type">gint64</span></a> *time_</code></em>);</pre> <p>Finds an interval within <em class="parameter"><code>tz</code></em> that corresponds to the given <em class="parameter"><code>time_</code></em> , possibly adjusting <em class="parameter"><code>time_</code></em> if required to fit into an interval. The meaning of <em class="parameter"><code>time_</code></em> depends on <em class="parameter"><code>type</code></em> .</p> <p>This function is similar to <a class="link" href="glib-GTimeZone.html#g-time-zone-find-interval" title="g_time_zone_find_interval ()"><code class="function">g_time_zone_find_interval()</code></a>, with the difference that it always succeeds (by making the adjustments described below).</p> <p>In any of the cases where <a class="link" href="glib-GTimeZone.html#g-time-zone-find-interval" title="g_time_zone_find_interval ()"><code class="function">g_time_zone_find_interval()</code></a> succeeds then this function returns the same value, without modifying <em class="parameter"><code>time_</code></em> .</p> <p>This function may, however, modify <em class="parameter"><code>time_</code></em> in order to deal with non-existent times. If the non-existent local <em class="parameter"><code>time_</code></em> of 02:30 were requested on March 14th 2010 in Toronto then this function would adjust <em class="parameter"><code>time_</code></em> to be 03:00 and return the interval containing the adjusted time.</p> <div class="refsect3"> <a name="g-time-zone-adjust-time.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>tz</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a></p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>type</p></td> <td class="parameter_description"><p>the <a class="link" href="glib-GTimeZone.html#GTimeType" title="enum GTimeType"><span class="type">GTimeType</span></a> of <em class="parameter"><code>time_</code></em> </p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>time_</p></td> <td class="parameter_description"><p>a pointer to a number of seconds since January 1, 1970</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="g-time-zone-adjust-time.returns"></a><h4>Returns</h4> <p> the interval containing <em class="parameter"><code>time_</code></em> , never -1</p> </div> <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p> </div> <hr> <div class="refsect2"> <a name="g-time-zone-get-identifier"></a><h3>g_time_zone_get_identifier ()</h3> <pre class="programlisting">const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * g_time_zone_get_identifier (<em class="parameter"><code><a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a> *tz</code></em>);</pre> <p>Get the identifier of this <a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a>, as passed to <a class="link" href="glib-GTimeZone.html#g-time-zone-new" title="g_time_zone_new ()"><code class="function">g_time_zone_new()</code></a>. If the identifier passed at construction time was not recognised, <code class="literal">UTC</code> will be returned. If it was <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>, the identifier of the local timezone at construction time will be returned.</p> <p>The identifier will be returned in the same format as provided at construction time: if provided as a time offset, that will be returned by this function.</p> <div class="refsect3"> <a name="g-time-zone-get-identifier.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>tz</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="g-time-zone-get-identifier.returns"></a><h4>Returns</h4> <p> identifier for this timezone</p> </div> <p class="since">Since: <a class="link" href="api-index-2-58.html#api-index-2.58">2.58</a></p> </div> <hr> <div class="refsect2"> <a name="g-time-zone-get-abbreviation"></a><h3>g_time_zone_get_abbreviation ()</h3> <pre class="programlisting">const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * g_time_zone_get_abbreviation (<em class="parameter"><code><a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a> *tz</code></em>, <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint"><span class="type">gint</span></a> interval</code></em>);</pre> <p>Determines the time zone abbreviation to be used during a particular <em class="parameter"><code>interval</code></em> of time in the time zone <em class="parameter"><code>tz</code></em> .</p> <p>For example, in Toronto this is currently "EST" during the winter months and "EDT" during the summer months when daylight savings time is in effect.</p> <div class="refsect3"> <a name="g-time-zone-get-abbreviation.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>tz</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a></p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>interval</p></td> <td class="parameter_description"><p>an interval within the timezone</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="g-time-zone-get-abbreviation.returns"></a><h4>Returns</h4> <p> the time zone abbreviation, which belongs to <em class="parameter"><code>tz</code></em> </p> </div> <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p> </div> <hr> <div class="refsect2"> <a name="g-time-zone-get-offset"></a><h3>g_time_zone_get_offset ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gint32" title="gint32"><span class="returnvalue">gint32</span></a> g_time_zone_get_offset (<em class="parameter"><code><a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a> *tz</code></em>, <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint"><span class="type">gint</span></a> interval</code></em>);</pre> <p>Determines the offset to UTC in effect during a particular <em class="parameter"><code>interval</code></em> of time in the time zone <em class="parameter"><code>tz</code></em> .</p> <p>The offset is the number of seconds that you add to UTC time to arrive at local time for <em class="parameter"><code>tz</code></em> (ie: negative numbers for time zones west of GMT, positive numbers for east).</p> <div class="refsect3"> <a name="g-time-zone-get-offset.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>tz</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a></p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>interval</p></td> <td class="parameter_description"><p>an interval within the timezone</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="g-time-zone-get-offset.returns"></a><h4>Returns</h4> <p> the number of seconds that should be added to UTC to get the local time in <em class="parameter"><code>tz</code></em> </p> </div> <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p> </div> <hr> <div class="refsect2"> <a name="g-time-zone-is-dst"></a><h3>g_time_zone_is_dst ()</h3> <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean" title="gboolean"><span class="returnvalue">gboolean</span></a> g_time_zone_is_dst (<em class="parameter"><code><a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a> *tz</code></em>, <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gint" title="gint"><span class="type">gint</span></a> interval</code></em>);</pre> <p>Determines if daylight savings time is in effect during a particular <em class="parameter"><code>interval</code></em> of time in the time zone <em class="parameter"><code>tz</code></em> .</p> <div class="refsect3"> <a name="g-time-zone-is-dst.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>tz</p></td> <td class="parameter_description"><p>a <a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a></p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>interval</p></td> <td class="parameter_description"><p>an interval within the timezone</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="g-time-zone-is-dst.returns"></a><h4>Returns</h4> <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if daylight savings time is in effect</p> </div> <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p> </div> </div> <div class="refsect1"> <a name="glib-GTimeZone.other_details"></a><h2>Types and Values</h2> <div class="refsect2"> <a name="GTimeZone"></a><h3>GTimeZone</h3> <pre class="programlisting">typedef struct _GTimeZone GTimeZone;</pre> <p><a class="link" href="glib-GTimeZone.html#GTimeZone" title="GTimeZone"><span class="type">GTimeZone</span></a> is an opaque structure whose members cannot be accessed directly.</p> <p class="since">Since: <a class="link" href="api-index-2-26.html#api-index-2.26">2.26</a></p> </div> <hr> <div class="refsect2"> <a name="GTimeType"></a><h3>enum GTimeType</h3> <p>Disambiguates a given time in two ways.</p> <p>First, specifies if the given time is in universal or local time.</p> <p>Second, if the time is in local time, specifies if it is local standard time or local daylight time. This is important for the case where the same local time occurs twice (during daylight savings time transitions, for example).</p> <div class="refsect3"> <a name="GTimeType.members"></a><h4>Members</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="300px" class="enum_members_name"> <col class="enum_members_description"> <col width="200px" class="enum_members_annotations"> </colgroup> <tbody> <tr> <td class="enum_member_name"><p><a name="G-TIME-TYPE-STANDARD:CAPS"></a>G_TIME_TYPE_STANDARD</p></td> <td class="enum_member_description"> <p>the time is in local standard time</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="G-TIME-TYPE-DAYLIGHT:CAPS"></a>G_TIME_TYPE_DAYLIGHT</p></td> <td class="enum_member_description"> <p>the time is in local daylight time</p> </td> <td class="enum_member_annotations"> </td> </tr> <tr> <td class="enum_member_name"><p><a name="G-TIME-TYPE-UNIVERSAL:CAPS"></a>G_TIME_TYPE_UNIVERSAL</p></td> <td class="enum_member_description"> <p>the time is in UTC</p> </td> <td class="enum_member_annotations"> </td> </tr> </tbody> </table></div> </div> </div> </div> <div class="refsect1"> <a name="glib-GTimeZone.see-also"></a><h2>See Also</h2> <p><a class="link" href="glib-GDateTime.html#GDateTime" title="GDateTime"><span class="type">GDateTime</span></a></p> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>