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<a name="zeitgeist-1.0-Timestamp-handling"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="zeitgeist-1.0-Timestamp-handling.top_of_page"></a>Timestamp handling</span></h2>
<p>Timestamp handling — Convenience functions for dealing with timestamps and dates</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="zeitgeist-1.0-Timestamp-handling.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">gint64</span>
</td>
<td class="function_name">
<a class="link" href="zeitgeist-1.0-Timestamp-handling.html#zeitgeist-timestamp-for-now" title="zeitgeist_timestamp_for_now ()">zeitgeist_timestamp_for_now</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gint64</span>
</td>
<td class="function_name">
<a class="link" href="zeitgeist-1.0-Timestamp-handling.html#zeitgeist-timestamp-from-date" title="zeitgeist_timestamp_from_date ()">zeitgeist_timestamp_from_date</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gint64</span>
</td>
<td class="function_name">
<a class="link" href="zeitgeist-1.0-Timestamp-handling.html#zeitgeist-timestamp-from-dmy" title="zeitgeist_timestamp_from_dmy ()">zeitgeist_timestamp_from_dmy</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gint64</span>
</td>
<td class="function_name">
<a class="link" href="zeitgeist-1.0-Timestamp-handling.html#zeitgeist-timestamp-from-iso8601" title="zeitgeist_timestamp_from_iso8601 ()">zeitgeist_timestamp_from_iso8601</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gint64</span>
</td>
<td class="function_name">
<a class="link" href="zeitgeist-1.0-Timestamp-handling.html#zeitgeist-timestamp-from-timeval" title="zeitgeist_timestamp_from_timeval ()">zeitgeist_timestamp_from_timeval</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gint64</span>
</td>
<td class="function_name">
<a class="link" href="zeitgeist-1.0-Timestamp-handling.html#zeitgeist-timestamp-next-midnight" title="zeitgeist_timestamp_next_midnight ()">zeitgeist_timestamp_next_midnight</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gint64</span>
</td>
<td class="function_name">
<a class="link" href="zeitgeist-1.0-Timestamp-handling.html#zeitgeist-timestamp-prev-midnight" title="zeitgeist_timestamp_prev_midnight ()">zeitgeist_timestamp_prev_midnight</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="zeitgeist-1.0-Timestamp-handling.html#zeitgeist-timestamp-to-date" title="zeitgeist_timestamp_to_date ()">zeitgeist_timestamp_to_date</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gchar</span> *
</td>
<td class="function_name">
<a class="link" href="zeitgeist-1.0-Timestamp-handling.html#zeitgeist-timestamp-to-iso8601" title="zeitgeist_timestamp_to_iso8601 ()">zeitgeist_timestamp_to_iso8601</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="zeitgeist-1.0-Timestamp-handling.html#zeitgeist-timestamp-to-timeval" title="zeitgeist_timestamp_to_timeval ()">zeitgeist_timestamp_to_timeval</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="zeitgeist-1.0-Timestamp-handling.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="zeitgeist-1.0-Timestamp-handling.html#ZEITGEIST-TIMESTAMP-SECOND:CAPS" title="ZEITGEIST_TIMESTAMP_SECOND">ZEITGEIST_TIMESTAMP_SECOND</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="zeitgeist-1.0-Timestamp-handling.html#ZEITGEIST-TIMESTAMP-MINUTE:CAPS" title="ZEITGEIST_TIMESTAMP_MINUTE">ZEITGEIST_TIMESTAMP_MINUTE</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="zeitgeist-1.0-Timestamp-handling.html#ZEITGEIST-TIMESTAMP-HOUR:CAPS" title="ZEITGEIST_TIMESTAMP_HOUR">ZEITGEIST_TIMESTAMP_HOUR</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="zeitgeist-1.0-Timestamp-handling.html#ZEITGEIST-TIMESTAMP-DAY:CAPS" title="ZEITGEIST_TIMESTAMP_DAY">ZEITGEIST_TIMESTAMP_DAY</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="zeitgeist-1.0-Timestamp-handling.html#ZEITGEIST-TIMESTAMP-WEEK:CAPS" title="ZEITGEIST_TIMESTAMP_WEEK">ZEITGEIST_TIMESTAMP_WEEK</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="zeitgeist-1.0-Timestamp-handling.html#ZEITGEIST-TIMESTAMP-YEAR:CAPS" title="ZEITGEIST_TIMESTAMP_YEAR">ZEITGEIST_TIMESTAMP_YEAR</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="zeitgeist-1.0-Timestamp-handling.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <zeitgeist.h>
</pre>
</div>
<div class="refsect1">
<a name="zeitgeist-1.0-Timestamp-handling.description"></a><h2>Description</h2>
<p>A suite of convenience functions for dealing with timestamps and dates.</p>
<p>Zeitgeist timestamps are represented as <span class="type">gint64</span>s with the number
of milliseconds since the Unix Epoch.</p>
</div>
<div class="refsect1">
<a name="zeitgeist-1.0-Timestamp-handling.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="zeitgeist-timestamp-for-now"></a><h3>zeitgeist_timestamp_for_now ()</h3>
<pre class="programlisting"><span class="returnvalue">gint64</span>
zeitgeist_timestamp_for_now (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Get the timestamp for the current system time</p>
<div class="refsect3">
<a name="id-1.3.3.7.2.5"></a><h4>Returns</h4>
<p> The timestamp for the current system time. Ie. the number of
milliseconds since the Unix Epoch</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="zeitgeist-timestamp-from-date"></a><h3>zeitgeist_timestamp_from_date ()</h3>
<pre class="programlisting"><span class="returnvalue">gint64</span>
zeitgeist_timestamp_from_date (<em class="parameter"><code><span class="type">GDate</span> *date</code></em>);</pre>
<p>Convert a <span class="type">GDate</span> to a Zeitgeist timestamp.</p>
<div class="refsect3">
<a name="id-1.3.3.7.3.5"></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>date</p></td>
<td class="parameter_description"><p>A <span class="type">GDate</span> to convert</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.7.3.6"></a><h4>Returns</h4>
<p> <em class="parameter"><code>date</code></em>
as a timestamp in milliseconds since the Epoch. The timestamp
is guaranteed to be rounded off to the midnight of the given date.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="zeitgeist-timestamp-from-dmy"></a><h3>zeitgeist_timestamp_from_dmy ()</h3>
<pre class="programlisting"><span class="returnvalue">gint64</span>
zeitgeist_timestamp_from_dmy (<em class="parameter"><code><span class="type">GDateDay</span> day</code></em>,
<em class="parameter"><code><span class="type">GDateMonth</span> month</code></em>,
<em class="parameter"><code><span class="type">GDateYear</span> year</code></em>);</pre>
<p>Convert a day, month, year tuple into a Zeitgeist timestamp</p>
<div class="refsect3">
<a name="id-1.3.3.7.4.5"></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>day</p></td>
<td class="parameter_description"><p>The day of the month represented as a <span class="type">GDateDay</span></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>month</p></td>
<td class="parameter_description"><p>The month of the year represented as a <span class="type">GDateMonth</span></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>year</p></td>
<td class="parameter_description"><p>The year represented as a <span class="type">GDateYear</span></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.7.4.6"></a><h4>Returns</h4>
<p> Input data as a timestamp in milliseconds since the Epoch or
-1 in case the provided data does not constitute a valid date.
If the date is valid the returned timestamp is guaranteed to be
rounded off to the midnight of the given date</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="zeitgeist-timestamp-from-iso8601"></a><h3>zeitgeist_timestamp_from_iso8601 ()</h3>
<pre class="programlisting"><span class="returnvalue">gint64</span>
zeitgeist_timestamp_from_iso8601 (<em class="parameter"><code>const <span class="type">gchar</span> *datetime</code></em>);</pre>
<p>Parse a timestamp from a ISO8601 encoded string.</p>
<div class="refsect3">
<a name="id-1.3.3.7.5.5"></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>datetime</p></td>
<td class="parameter_description"><p>A string containing an iso8601 conforming datetime specification</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.7.5.6"></a><h4>Returns</h4>
<p> The timestamp represented by <em class="parameter"><code>datetime</code></em>
, or -1 on failure to parse
<em class="parameter"><code>datetime</code></em>
</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="zeitgeist-timestamp-from-timeval"></a><h3>zeitgeist_timestamp_from_timeval ()</h3>
<pre class="programlisting"><span class="returnvalue">gint64</span>
zeitgeist_timestamp_from_timeval (<em class="parameter"><code><span class="type">GTimeVal</span> *tv</code></em>);</pre>
<div class="refsect3">
<a name="id-1.3.3.7.6.4"></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>tv</p></td>
<td class="parameter_description"><p>A <span class="type">GTimeVal</span> instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.7.6.5"></a><h4>Returns</h4>
<p> A <span class="type">gint64</span> with the total number of milliseconds since the Unix Epoch</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="zeitgeist-timestamp-next-midnight"></a><h3>zeitgeist_timestamp_next_midnight ()</h3>
<pre class="programlisting"><span class="returnvalue">gint64</span>
zeitgeist_timestamp_next_midnight (<em class="parameter"><code><span class="type">gint64</span> timestamp</code></em>);</pre>
<p>Calculate the timestamp for the next midnight after <em class="parameter"><code>timestamp</code></em>
</p>
<div class="refsect3">
<a name="id-1.3.3.7.7.5"></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>timestamp</p></td>
<td class="parameter_description"><p>The Zeitgeist timestamp to find the next midnight for</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.7.7.6"></a><h4>Returns</h4>
<p> Returns the timestamp for the first midnight after <em class="parameter"><code>timestamp</code></em>
.
If <em class="parameter"><code>timestamp</code></em>
is already midnight (down to the millisecond) this
method will return the value for the next midnight. In other words
you can call this method recursively in order to iterate, forwards
in time, over midnights.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="zeitgeist-timestamp-prev-midnight"></a><h3>zeitgeist_timestamp_prev_midnight ()</h3>
<pre class="programlisting"><span class="returnvalue">gint64</span>
zeitgeist_timestamp_prev_midnight (<em class="parameter"><code><span class="type">gint64</span> timestamp</code></em>);</pre>
<p>Calculate the timestamp for the midnight just before <em class="parameter"><code>timestamp</code></em>
</p>
<div class="refsect3">
<a name="id-1.3.3.7.8.5"></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>timestamp</p></td>
<td class="parameter_description"><p>The Zeitgeist timestamp to find the previous midnight for</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.7.8.6"></a><h4>Returns</h4>
<p> Returns the timestamp for the first midnight just before <em class="parameter"><code>timestamp</code></em>
.
If <em class="parameter"><code>timestamp</code></em>
is already midnight (down to the millisecond) this
method will return the value for the midnight before. In other words
you can call this method recursively in order to iterate, backwards
in time, over midnights.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="zeitgeist-timestamp-to-date"></a><h3>zeitgeist_timestamp_to_date ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
zeitgeist_timestamp_to_date (<em class="parameter"><code><span class="type">gint64</span> timestamp</code></em>,
<em class="parameter"><code><span class="type">GDate</span> *date</code></em>);</pre>
<p>Write a timestamp to a <span class="type">GDate</span> structure</p>
<div class="refsect3">
<a name="id-1.3.3.7.9.5"></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>timestamp</p></td>
<td class="parameter_description"><p>The Zeitgeist timestamp to convert to a <span class="type">GDate</span></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>date</p></td>
<td class="parameter_description"><p>The place to store the result in. Must be non-<code class="literal">NULL</code></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="zeitgeist-timestamp-to-iso8601"></a><h3>zeitgeist_timestamp_to_iso8601 ()</h3>
<pre class="programlisting"><span class="returnvalue">gchar</span> *
zeitgeist_timestamp_to_iso8601 (<em class="parameter"><code><span class="type">gint64</span> timestamp</code></em>);</pre>
<p>Convert a timestamp to a human readable ISO8601 format</p>
<div class="refsect3">
<a name="id-1.3.3.7.10.5"></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>timestamp</p></td>
<td class="parameter_description"><p>A Zeitgeist timestamp in ms since the Epoch</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.7.10.6"></a><h4>Returns</h4>
<p> A newly allocated string containing the ISO8601 format of
<em class="parameter"><code>timestamp</code></em>
. Free with <code class="function">g_free()</code>.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="zeitgeist-timestamp-to-timeval"></a><h3>zeitgeist_timestamp_to_timeval ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
zeitgeist_timestamp_to_timeval (<em class="parameter"><code><span class="type">gint64</span> timestamp</code></em>,
<em class="parameter"><code><span class="type">GTimeVal</span> *tv</code></em>);</pre>
<p>Write a Zeitgeist timestamp to a <span class="type">GTimeVal</span> instance. Note that Zeitgeist
uses only a millisecond resolution for where <span class="type">GTimeVal</span> uses a microsecond
resolution, meaning that the lower three digits of <em class="parameter"><code>tv.tv_usec</code></em>
will
be 0.</p>
<div class="refsect3">
<a name="id-1.3.3.7.11.5"></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>timestamp</p></td>
<td class="parameter_description"><p>A <span class="type">gint64</span> with a number of milliseconds since the Unix Epoch</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>tv</p></td>
<td class="parameter_description"><p>A <span class="type">GTimeVal</span> instance to store the result in</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="zeitgeist-1.0-Timestamp-handling.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="ZEITGEIST-TIMESTAMP-SECOND:CAPS"></a><h3>ZEITGEIST_TIMESTAMP_SECOND</h3>
<pre class="programlisting">#define ZEITGEIST_TIMESTAMP_SECOND G_GINT64_CONSTANT (1000)
</pre>
<p>A second represented as a Zeitgeist timestamp (ie. 1000ms)</p>
</div>
<hr>
<div class="refsect2">
<a name="ZEITGEIST-TIMESTAMP-MINUTE:CAPS"></a><h3>ZEITGEIST_TIMESTAMP_MINUTE</h3>
<pre class="programlisting">#define ZEITGEIST_TIMESTAMP_MINUTE G_GINT64_CONSTANT (60000)
</pre>
<p>A minute represented as a Zeitgeist timestamp (ie. 60000ms)</p>
</div>
<hr>
<div class="refsect2">
<a name="ZEITGEIST-TIMESTAMP-HOUR:CAPS"></a><h3>ZEITGEIST_TIMESTAMP_HOUR</h3>
<pre class="programlisting">#define ZEITGEIST_TIMESTAMP_HOUR G_GINT64_CONSTANT (3600000)
</pre>
<p>An hour represented as a Zeitgeist timestamp (ie. 3600000ms)</p>
</div>
<hr>
<div class="refsect2">
<a name="ZEITGEIST-TIMESTAMP-DAY:CAPS"></a><h3>ZEITGEIST_TIMESTAMP_DAY</h3>
<pre class="programlisting">#define ZEITGEIST_TIMESTAMP_DAY G_GINT64_CONSTANT (86400000)
</pre>
<p>A day represented as a Zeitgeist timestamp (ie. 86400000ms)</p>
</div>
<hr>
<div class="refsect2">
<a name="ZEITGEIST-TIMESTAMP-WEEK:CAPS"></a><h3>ZEITGEIST_TIMESTAMP_WEEK</h3>
<pre class="programlisting">#define ZEITGEIST_TIMESTAMP_WEEK G_GINT64_CONSTANT (604800000)
</pre>
<p>A week represented as a Zeitgeist timestamp (ie. 604800000ms)</p>
</div>
<hr>
<div class="refsect2">
<a name="ZEITGEIST-TIMESTAMP-YEAR:CAPS"></a><h3>ZEITGEIST_TIMESTAMP_YEAR</h3>
<pre class="programlisting">#define ZEITGEIST_TIMESTAMP_YEAR G_GINT64_CONSTANT (31556952000)
</pre>
<p>A year represented as a Zeitgeist timestamp (ie. 31556952000ms).
Be warned that a year is not 365 days, but in fact 365.2425 days to
account for leap years.</p>
</div>
</div>
</div>
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