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<title>The DateTime class</title>
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<h1 class="title">The DateTime class</h1>
<div class="partintro"><p class="verinfo">(PHP 5 >= 5.2.0, PHP 7)</p>
<div class="section" id="datetime.intro">
<h2 class="title">Introduction</h2>
<p class="para">
Representation of date and time.
</p>
</div>
<div class="section" id="datetime.synopsis">
<h2 class="title">Class synopsis</h2>
<div class="classsynopsis">
<div class="ooclass"></div>
<div class="classsynopsisinfo">
<span class="ooclass">
<strong class="classname">DateTime</strong>
</span>
<span class="oointerface">implements
<span class="interfacename"><a href="class.datetimeinterface.html" class="interfacename">DateTimeInterface</a></span>
</span>
{</div>
<div class="classsynopsisinfo classsynopsisinfo_comment">/* Inherited constants */</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">string</span>
<var class="fieldsynopsis_varname"><a href="class.datetimeinterface.html#datetime.constants.atom"><var class="varname">DateTimeInterface::ATOM</var></a></var>
<span class="initializer"> = "Y-m-d\TH:i:sP"</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">string</span>
<var class="fieldsynopsis_varname"><a href="class.datetimeinterface.html#datetime.constants.cookie"><var class="varname">DateTimeInterface::COOKIE</var></a></var>
<span class="initializer"> = "l, d-M-Y H:i:s T"</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">string</span>
<var class="fieldsynopsis_varname"><a href="class.datetimeinterface.html#datetime.constants.iso8601"><var class="varname">DateTimeInterface::ISO8601</var></a></var>
<span class="initializer"> = "Y-m-d\TH:i:sO"</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">string</span>
<var class="fieldsynopsis_varname"><a href="class.datetimeinterface.html#datetime.constants.rfc822"><var class="varname">DateTimeInterface::RFC822</var></a></var>
<span class="initializer"> = "D, d M y H:i:s O"</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">string</span>
<var class="fieldsynopsis_varname"><a href="class.datetimeinterface.html#datetime.constants.rfc850"><var class="varname">DateTimeInterface::RFC850</var></a></var>
<span class="initializer"> = "l, d-M-y H:i:s T"</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">string</span>
<var class="fieldsynopsis_varname"><a href="class.datetimeinterface.html#datetime.constants.rfc1036"><var class="varname">DateTimeInterface::RFC1036</var></a></var>
<span class="initializer"> = "D, d M y H:i:s O"</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">string</span>
<var class="fieldsynopsis_varname"><a href="class.datetimeinterface.html#datetime.constants.rfc1123"><var class="varname">DateTimeInterface::RFC1123</var></a></var>
<span class="initializer"> = "D, d M Y H:i:s O"</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">string</span>
<var class="fieldsynopsis_varname"><a href="class.datetimeinterface.html#datetime.constants.rfc2822"><var class="varname">DateTimeInterface::RFC2822</var></a></var>
<span class="initializer"> = "D, d M Y H:i:s O"</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">string</span>
<var class="fieldsynopsis_varname"><a href="class.datetimeinterface.html#datetime.constants.rfc3339"><var class="varname">DateTimeInterface::RFC3339</var></a></var>
<span class="initializer"> = "Y-m-d\TH:i:sP"</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">string</span>
<var class="fieldsynopsis_varname"><a href="class.datetimeinterface.html#datetime.constants.rfc3339_extended"><var class="varname">DateTimeInterface::RFC3339_EXTENDED</var></a></var>
<span class="initializer"> = "Y-m-d\TH:i:s.vP"</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">string</span>
<var class="fieldsynopsis_varname"><a href="class.datetimeinterface.html#datetime.constants.rss"><var class="varname">DateTimeInterface::RSS</var></a></var>
<span class="initializer"> = "D, d M Y H:i:s O"</span>
;</div>
<div class="fieldsynopsis">
<span class="modifier">const</span>
<span class="type">string</span>
<var class="fieldsynopsis_varname"><a href="class.datetimeinterface.html#datetime.constants.w3c"><var class="varname">DateTimeInterface::W3C</var></a></var>
<span class="initializer"> = "Y-m-d\TH:i:sP"</span>
;</div>
<div class="classsynopsisinfo classsynopsisinfo_comment">/* Methods */</div>
<div class="constructorsynopsis dc-description">
<span class="modifier">public</span> <span class="methodname"><a href="datetime.construct.html" class="methodname">__construct</a></span>
([ <span class="methodparam"><span class="type">string</span> <code class="parameter">$time</code><span class="initializer"> = "now"</span></span>
[, <span class="methodparam"><span class="type"><a href="class.datetimezone.html" class="type DateTimeZone">DateTimeZone</a></span> <code class="parameter">$timezone</code><span class="initializer"> = <strong><code>NULL</code></strong></span></span>
]] )</div>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="type">DateTime</span> <span class="methodname"><a href="datetime.add.html" class="methodname">add</a></span>
( <span class="methodparam"><span class="type"><a href="class.dateinterval.html" class="type DateInterval">DateInterval</a></span> <code class="parameter">$interval</code></span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="modifier">static</span> <span class="type">DateTime</span> <span class="methodname"><a href="datetime.createfromformat.html" class="methodname">createFromFormat</a></span>
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$format</code></span>
, <span class="methodparam"><span class="type">string</span> <code class="parameter">$time</code></span>
[, <span class="methodparam"><span class="type"><a href="class.datetimezone.html" class="type DateTimeZone">DateTimeZone</a></span> <code class="parameter">$timezone</code></span>
] )</div>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="modifier">static</span> <span class="type">array</span> <span class="methodname"><a href="datetime.getlasterrors.html" class="methodname">getLastErrors</a></span>
( <span class="methodparam">void</span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="type">DateTime</span> <span class="methodname"><a href="datetime.modify.html" class="methodname">modify</a></span>
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$modify</code></span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="modifier">static</span> <span class="type">DateTime</span> <span class="methodname"><a href="datetime.set-state.html" class="methodname">__set_state</a></span>
( <span class="methodparam"><span class="type">array</span> <code class="parameter">$array</code></span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="type">DateTime</span> <span class="methodname"><a href="datetime.setdate.html" class="methodname">setDate</a></span>
( <span class="methodparam"><span class="type">int</span> <code class="parameter">$year</code></span>
, <span class="methodparam"><span class="type">int</span> <code class="parameter">$month</code></span>
, <span class="methodparam"><span class="type">int</span> <code class="parameter">$day</code></span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="type">DateTime</span> <span class="methodname"><a href="datetime.setisodate.html" class="methodname">setISODate</a></span>
( <span class="methodparam"><span class="type">int</span> <code class="parameter">$year</code></span>
, <span class="methodparam"><span class="type">int</span> <code class="parameter">$week</code></span>
[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$day</code><span class="initializer"> = 1</span></span>
] )</div>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="type">DateTime</span> <span class="methodname"><a href="datetime.settime.html" class="methodname">setTime</a></span>
( <span class="methodparam"><span class="type">int</span> <code class="parameter">$hour</code></span>
, <span class="methodparam"><span class="type">int</span> <code class="parameter">$minute</code></span>
[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$second</code><span class="initializer"> = 0</span></span>
[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$microseconds</code><span class="initializer"> = 0</span></span>
]] )</div>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="type">DateTime</span> <span class="methodname"><a href="datetime.settimestamp.html" class="methodname">setTimestamp</a></span>
( <span class="methodparam"><span class="type">int</span> <code class="parameter">$unixtimestamp</code></span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="type">DateTime</span> <span class="methodname"><a href="datetime.settimezone.html" class="methodname">setTimezone</a></span>
( <span class="methodparam"><span class="type"><a href="class.datetimezone.html" class="type DateTimeZone">DateTimeZone</a></span> <code class="parameter">$timezone</code></span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="type">DateTime</span> <span class="methodname"><a href="datetime.sub.html" class="methodname">sub</a></span>
( <span class="methodparam"><span class="type"><a href="class.dateinterval.html" class="type DateInterval">DateInterval</a></span> <code class="parameter">$interval</code></span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="type">DateInterval</span> <span class="methodname"><a href="datetime.diff.html" class="methodname">diff</a></span>
( <span class="methodparam"><span class="type"><a href="class.datetimeinterface.html" class="type DateTimeInterface">DateTimeInterface</a></span> <code class="parameter">$datetime2</code></span>
[, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$absolute</code><span class="initializer"> = <strong><code>FALSE</code></strong></span></span>
] )</div>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="type">string</span> <span class="methodname"><a href="datetime.format.html" class="methodname">format</a></span>
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$format</code></span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="type">int</span> <span class="methodname"><a href="datetime.getoffset.html" class="methodname">getOffset</a></span>
( <span class="methodparam">void</span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="type">int</span> <span class="methodname"><a href="datetime.gettimestamp.html" class="methodname">getTimestamp</a></span>
( <span class="methodparam">void</span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="type">DateTimeZone</span> <span class="methodname"><a href="datetime.gettimezone.html" class="methodname">getTimezone</a></span>
( <span class="methodparam">void</span>
)</div>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="methodname"><a href="datetime.wakeup.html" class="methodname">__wakeup</a></span>
( <span class="methodparam">void</span>
)</div>
}</div>
</div>
<div class="section" id="datetime.changelog">
<h2 class="title">Changelog</h2>
<p class="para">
<table class="doctable informaltable">
<thead>
<tr>
<th>Version</th>
<th>Description</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td>7.2.0</td>
<td>
The class constants of <strong class="classname">DateTime</strong> are now defined
on <a href="class.datetimeinterface.html" class="classname">DateTimeInterface</a>.
</td>
</tr>
<tr>
<td>7.0.0</td>
<td>
Added constants: <a href="class.datetimeinterface.html#datetime.constants.rfc3339_extended" class="link">DATE_RFC3339_EXTENDED</a> and
<a href="class.datetimeinterface.html#datetime.constants.rfc3339_extended" class="link">DateTime::RFC3339_EXTENDED</a>.
</td>
</tr>
<tr>
<td>5.5.0</td>
<td>
The class now implements <a href="class.datetimeinterface.html" class="classname">DateTimeInterface</a>.
</td>
</tr>
<tr>
<td>5.4.24</td>
<td>
The COOKIE constant was changed to reflect RFC 1036 using a four digit
year rather than a two digit year (RFC 850) as prior versions.
</td>
</tr>
<tr>
<td>5.2.2</td>
<td>
DateTime object comparison with the
<a href="language.operators.comparison.html" class="link">comparison operators</a>
changed to work as expected. Previously, all DateTime objects were
considered equal (using <em>==</em>).
</td>
</tr>
</tbody>
</table>
</p>
</div>
</div>
<h2>Table of Contents</h2><ul class="chunklist chunklist_reference"><li><a href="datetime.add.html">DateTime::add</a> — Adds an amount of days, months, years, hours, minutes and seconds to a
DateTime object</li><li><a href="datetime.construct.html">DateTime::__construct</a> — Returns new DateTime object</li><li><a href="datetime.createfromformat.html">DateTime::createFromFormat</a> — Parses a time string according to a specified format</li><li><a href="datetime.getlasterrors.html">DateTime::getLastErrors</a> — Returns the warnings and errors</li><li><a href="datetime.modify.html">DateTime::modify</a> — Alters the timestamp</li><li><a href="datetime.set-state.html">DateTime::__set_state</a> — The __set_state handler</li><li><a href="datetime.setdate.html">DateTime::setDate</a> — Sets the date</li><li><a href="datetime.setisodate.html">DateTime::setISODate</a> — Sets the ISO date</li><li><a href="datetime.settime.html">DateTime::setTime</a> — Sets the time</li><li><a href="datetime.settimestamp.html">DateTime::setTimestamp</a> — Sets the date and time based on an Unix timestamp</li><li><a href="datetime.settimezone.html">DateTime::setTimezone</a> — Sets the time zone for the DateTime object</li><li><a href="datetime.sub.html">DateTime::sub</a> — Subtracts an amount of days, months, years, hours, minutes and seconds from
a DateTime object</li></ul>
</div>
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