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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>NSDate class reference</title>
</head>
<body>
<font face="serif">
<a href="Base.html">Up</a>
<br />
<h1><a name="title$NSDate">NSDate class reference</a></h1>
<h3>Authors</h3>
<dl>
<dt>Jeremy Bettis (<a href="mailto:jeremy@hksys.com"><code>jeremy@hksys.com</code></a>)</dt>
<dd>
</dd>
<dt>Scott Christley (<a href="mailto:scottc@net-community.com"><code>scottc@net-community.com</code></a>)</dt>
<dd>
</dd>
<dt>Richard Frith-Macdonald (<a href="mailto:richard@brainstorm.co.uk"><code>richard@brainstorm.co.uk</code></a>)</dt>
<dd>
</dd>
</dl>
<p><b>Copyright:</b> (C)
1995, 1996, 1997, 1998 Free Software Foundation, Inc.
</p>
<div>
</div>
<h1><a name="001000000000">
Software documentation for the NSDate class
</a></h1>
<h2><a name="class$NSDate">NSDate</a> : <a rel="gsdoc" href="NSObject.html#class$NSObject">NSObject</a></h2>
<blockquote class="declared">
<dl>
<dt><b>Declared in:</b></dt>
<dd>Foundation/NSDate.h</dd>
</dl>
</blockquote>
<blockquote>
<dl>
<dt><b>Conforms to:</b></dt>
<dd><a rel="gsdoc" href="NSObject.html#protocol$(NSCoding)">NSCoding</a></dd>
<dd><a rel="gsdoc" href="NSObject.html#protocol$(NSCopying)">NSCopying</a></dd>
</dl>
</blockquote>
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
An <code>NSDate</code> object encapsulates a constant
date/time to a high resolution represented by the
<code>NSTimeInterval</code> typedef.
<code>NSDate</code> has methods relating to times and
time differences in the abstract, but not calendar dates
or time zones. These features are added in the
<a rel="gsdoc" href="NSCalendarDate.html#class$NSCalendarDate">NSCalendarDate</a>
subclass. The
<a rel="gsdoc" href="NSTimeZone.html#class$NSTimeZone">NSTimeZone</a>
class handles time zone information.
</div>
<b>Method summary</b>
<ul>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate+date">+date</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate+dateWithNaturalLanguageString$">+dateWithNaturalLanguageString:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate+dateWithNaturalLanguageString$locale$">+dateWithNaturalLanguageString:locale:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate+dateWithString$">+dateWithString:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate+dateWithTimeInterval$sinceDate$">+dateWithTimeInterval:sinceDate:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate+dateWithTimeIntervalSince1970$">+dateWithTimeIntervalSince1970:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate+dateWithTimeIntervalSinceNow$">+dateWithTimeIntervalSinceNow:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate+dateWithTimeIntervalSinceReferenceDate$">+dateWithTimeIntervalSinceReferenceDate:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate+distantFuture">+distantFuture</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate+distantPast">+distantPast</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate+timeIntervalSinceReferenceDate">+timeIntervalSinceReferenceDate</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate-addTimeInterval$">-addTimeInterval:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate-compare$">-compare:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate-dateByAddingTimeInterval$">-dateByAddingTimeInterval:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate-dateWithCalendarFormat$timeZone$">-dateWithCalendarFormat:timeZone:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate-description">-description</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate-descriptionWithCalendarFormat$timeZone$locale$">-descriptionWithCalendarFormat:timeZone:locale:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate-descriptionWithLocale$">-descriptionWithLocale:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate-earlierDate$">-earlierDate:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate-init">-init</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate-initWithString$">-initWithString:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate-initWithTimeInterval$sinceDate$">-initWithTimeInterval:sinceDate:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate-initWithTimeIntervalSince1970$">-initWithTimeIntervalSince1970:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate-initWithTimeIntervalSinceNow$">-initWithTimeIntervalSinceNow:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate-initWithTimeIntervalSinceReferenceDate$">-initWithTimeIntervalSinceReferenceDate:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate-isEqual$">-isEqual:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate-isEqualToDate$">-isEqualToDate:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate-laterDate$">-laterDate:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate-timeIntervalSince1970">-timeIntervalSince1970</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate-timeIntervalSinceDate$">-timeIntervalSinceDate:</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate-timeIntervalSinceNow">-timeIntervalSinceNow</a></li>
<li><a rel="gsdoc" href="NSDate.html#method$NSDate-timeIntervalSinceReferenceDate">-timeIntervalSinceReferenceDate</a></li>
</ul>
<hr width="50%" align="left" />
<div class="method">
<h3><a name="method$NSDate+date">date </a></h3>
+ (id) <b>date</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns an autoreleased instance with the current
date/time.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate+dateWithNaturalLanguageString$">dateWithNaturalLanguageString: </a></h3>
+ (id) <b>dateWithNaturalLanguageString:</b> (<a rel="gsdoc" href="NSString.html#class$NSString">NSString</a>*)string;<br />
<div class="availability">
<b>Availability:</b> MacOS-X 10.0.0</div>
<br />
<div class="desc">
Returns an autoreleased instance representing the
date and time given by <var>string</var>. The value of
<var>string</var> may be a 'natural' specification as
specified by the preferences in the user defaults
database, allowing phrases like 'last tuesday'
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate+dateWithNaturalLanguageString$locale$">dateWithNaturalLanguageString: locale: </a></h3>
+ (id) <b>dateWithNaturalLanguageString:</b> (<a rel="gsdoc" href="NSString.html#class$NSString">NSString</a>*)string<b> locale:</b> (<a rel="gsdoc" href="NSDictionary.html#class$NSDictionary">NSDictionary</a>*)locale;<br />
<div class="availability">
<b>Availability:</b> MacOS-X 10.0.0</div>
<br />
<div class="desc">
</p>
<p>
Returns an autoreleased instance representing the
date and time given by <var>string</var>. The value
of <var>string</var> may be a 'natural' specification
as specified by the preferences in the user defaults
database, allowing phrases like 'last tuesday'
</p>
<p>
The <var>locale</var> contains keys such as -
<dl>
<dt>NSDateTimeOrdering</dt>
<dd>
Controls the use of ambiguous numbers. This is
done as a sequence of the letters D(ay), M(onth),
Y(ear), and H(our). YMDH means that the first
number encountered is assumed to be a year, the
second a month, the third a day, and the last an
hour.
</dd>
<dt>NSEarlierTimeDesignations</dt>
<dd>
An array of strings for times in the past. <br />
Defaults are <em>ago</em>, <em>last</em>,
<em>past</em>, <em>prior</em>
</dd>
<dt>NSHourNameDesignations</dt>
<dd>
An array of arrays of strings identifying the time
of day. Each array has an hour as its first value,
and one or more words as subsequent values. <br />
Defaults are: (0, midnight), (10, morning),
(12, noon, lunch), (14, afternoon), (19, dinner).
</dd>
<dt>NSLaterTimeDesignations</dt>
<dd>
An array of strings for times in the future. <br />
Default is <em>next</em>
</dd>
<dt>NSNextDayDesignations</dt>
<dd>
The day after today. Default is <em>tomorrow.</em>
</dd>
<dt>NSNextNextDayDesignations</dt>
<dd>
The day after tomorrow. Default is
<em>nextday.</em>
</dd>
<dt>NSPriorDayDesignations</dt>
<dd>
The day before today. Default is
<em>yesterday.</em>
</dd>
<dt>NSThisDayDesignations</dt>
<dd>
Identifies the current day. Default is
<em>today.</em>
</dd>
<dt>NSYearMonthWeekDesignations</dt>
<dd>
An array giving the word for year, month, and week.
<br /> Defaults are <em>year</em>,
<em>month</em> and <em>week</em>.
</dd>
</dl>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate+dateWithString$">dateWithString: </a></h3>
+ (id) <b>dateWithString:</b> (<a rel="gsdoc" href="NSString.html#class$NSString">NSString</a>*)description;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns an autoreleased instance with the date and
time value given by the string using the ISO standard
format YYYY-MM-DD HH:MM:SS +/-HHHMM (all the fields
of which must be present).
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate+dateWithTimeInterval$sinceDate$">dateWithTimeInterval: sinceDate: </a></h3>
+ (id) <b>dateWithTimeInterval:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSTimeInterval">NSTimeInterval</a>)seconds<b> sinceDate:</b> (<a rel="gsdoc" href="#class$NSDate">NSDate</a>*)date;<br />
<div class="availability">
<b>Availability:</b> MacOS-X 10.6.0</div>
<br />
<div class="desc">
Returns an autoreleased NSDate instance whose value
is offset from that of the given <var>date</var> by the
specified interval in <var>seconds</var>.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate+dateWithTimeIntervalSince1970$">dateWithTimeIntervalSince1970: </a></h3>
+ (id) <b>dateWithTimeIntervalSince1970:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSTimeInterval">NSTimeInterval</a>)seconds;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns an autoreleased instance with the offset
from the unix system reference date of 1 January 1970,
GMT.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate+dateWithTimeIntervalSinceNow$">dateWithTimeIntervalSinceNow: </a></h3>
+ (id) <b>dateWithTimeIntervalSinceNow:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSTimeInterval">NSTimeInterval</a>)seconds;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns an autoreleased instance with the offset
from the current date/time given by <var>seconds</var>
(which may be fractional).
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate+dateWithTimeIntervalSinceReferenceDate$">dateWithTimeIntervalSinceReferenceDate: </a></h3>
+ (id) <b>dateWithTimeIntervalSinceReferenceDate:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSTimeInterval">NSTimeInterval</a>)seconds;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns an autoreleased instance with the offset
from the OpenStep reference date of 1 January 2001,
GMT.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate+distantFuture">distantFuture </a></h3>
+ (id) <b>distantFuture</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns an autoreleased instance with the date/time
set in the far future.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate+distantPast">distantPast </a></h3>
+ (id) <b>distantPast</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns an autoreleased instance with the date/time
set in the far past.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate+timeIntervalSinceReferenceDate">timeIntervalSinceReferenceDate </a></h3>
+ (<a rel="gsdoc" href="TypesAndConstants.html#type$NSTimeInterval">NSTimeInterval</a>) <b>timeIntervalSinceReferenceDate</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns the time interval between the reference
date and the current time. <br /> Returns the time
interval between the current date and the
reference date (1 January 2001, GMT).
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate-addTimeInterval$">addTimeInterval: </a></h3>
- (id) <b>addTimeInterval:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSTimeInterval">NSTimeInterval</a>)seconds;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns an autorelease date instance formed by
adding the specified time interval in
<var>seconds</var> to the receiver's time interval.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate-compare$">compare: </a></h3>
- (<a rel="gsdoc" href="TypesAndConstants.html#type$NSComparisonResult">NSComparisonResult</a>) <b>compare:</b> (<a rel="gsdoc" href="#class$NSDate">NSDate</a>*)otherDate;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns the time interval between the receivers
value and the OpenStep reference date of 1 Jan 2001
GMT.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate-dateByAddingTimeInterval$">dateByAddingTimeInterval: </a></h3>
- (id) <b>dateByAddingTimeInterval:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSTimeInterval">NSTimeInterval</a>)ti;<br />
<div class="availability">
<b>Availability:</b> MacOS-X 10.6.0</div>
<br />
<div class="desc">
Returns an autoreleased NSDate instance whose value
is offset from that of the receiver by the specified
interval.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate-dateWithCalendarFormat$timeZone$">dateWithCalendarFormat: timeZone: </a></h3>
- (<a rel="gsdoc" href="NSCalendarDate.html#class$NSCalendarDate">NSCalendarDate</a>*) <b>dateWithCalendarFormat:</b> (<a rel="gsdoc" href="NSString.html#class$NSString">NSString</a>*)formatString<b> timeZone:</b> (<a rel="gsdoc" href="NSTimeZone.html#class$NSTimeZone">NSTimeZone</a>*)timeZone;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns an autoreleased instance of the
<a rel="gsdoc" href="NSCalendarDate.html#class$NSCalendarDate">NSCalendarDate</a>
class whose date/time value is the same as that of
the receiver, and which uses the
<var>formatString</var> and <var>timeZone</var>
specified.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate-description">description </a></h3>
- (<a rel="gsdoc" href="NSString.html#class$NSString">NSString</a>*) <b>description</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns a string representation of the receiver
formatted according to the default format string,
time zone, and locale.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate-descriptionWithCalendarFormat$timeZone$locale$">descriptionWithCalendarFormat: timeZone: locale: </a></h3>
- (<a rel="gsdoc" href="NSString.html#class$NSString">NSString</a>*) <b>descriptionWithCalendarFormat:</b> (<a rel="gsdoc" href="NSString.html#class$NSString">NSString</a>*)format<b> timeZone:</b> (<a rel="gsdoc" href="NSTimeZone.html#class$NSTimeZone">NSTimeZone</a>*)aTimeZone<b> locale:</b> (<a rel="gsdoc" href="NSDictionary.html#class$NSDictionary">NSDictionary</a>*)l;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns a string representation of the receiver
formatted according to the specified
<var>format</var> string, time zone, and locale.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate-descriptionWithLocale$">descriptionWithLocale: </a></h3>
- (<a rel="gsdoc" href="NSString.html#class$NSString">NSString</a>*) <b>descriptionWithLocale:</b> (id)locale;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns a string representation of the receiver
formatted according to the default format string
and time zone, but using the given <var>locale</var>.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate-earlierDate$">earlierDate: </a></h3>
- (<a rel="gsdoc" href="#class$NSDate">NSDate</a>*) <b>earlierDate:</b> (<a rel="gsdoc" href="#class$NSDate">NSDate</a>*)otherDate;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns the earlier of the receiver and
<var>otherDate</var>. <br /> If the two represent
identical date/time values, returns the receiver.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate-init">init </a></h3>
- (id) <b>init</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns an instance initialised with the current
date/time.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate-initWithString$">initWithString: </a></h3>
- (id) <b>initWithString:</b> (<a rel="gsdoc" href="NSString.html#class$NSString">NSString</a>*)description;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns an instance with the date and time value
given by the string using the ISO standard format
YYYY-MM-DD HH:MM:SS +/-HHHMM (all the fields of
which must be present).
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate-initWithTimeInterval$sinceDate$">initWithTimeInterval: sinceDate: </a></h3>
- (id) <b>initWithTimeInterval:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSTimeInterval">NSTimeInterval</a>)secsToBeAdded<b> sinceDate:</b> (<a rel="gsdoc" href="#class$NSDate">NSDate</a>*)anotherDate;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns an instance with the given offset from
<var>anotherDate</var>.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate-initWithTimeIntervalSince1970$">initWithTimeIntervalSince1970: </a></h3>
- (id) <b>initWithTimeIntervalSince1970:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSTimeInterval">NSTimeInterval</a>)seconds;<br />
<div class="availability">
<b>Availability:</b> MacOS-X 10.0.0</div>
<br />
<div class="desc">
Returns an instance with the offset from the unix
system reference date of 1 January 1970, GMT.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate-initWithTimeIntervalSinceNow$">initWithTimeIntervalSinceNow: </a></h3>
- (id) <b>initWithTimeIntervalSinceNow:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSTimeInterval">NSTimeInterval</a>)secsToBeAdded;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns an instance with the offset from the
current date/time.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate-initWithTimeIntervalSinceReferenceDate$">initWithTimeIntervalSinceReferenceDate: </a></h3>
- (id) <b>initWithTimeIntervalSinceReferenceDate:</b> (<a rel="gsdoc" href="TypesAndConstants.html#type$NSTimeInterval">NSTimeInterval</a>)secs;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
This is a designated initialiser for the class.<br />
<div class="desc">
Returns an instance with the given offset from the
OpenStep reference date of 1 January 2001, GMT.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate-isEqual$">isEqual: </a></h3>
- (BOOL) <b>isEqual:</b> (id)other;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns <code>NO</code> if <var>other</var> is not
a date, otherwise returns the result of calling the
-isEqualtoDate:
method.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate-isEqualToDate$">isEqualToDate: </a></h3>
- (BOOL) <b>isEqualToDate:</b> (<a rel="gsdoc" href="#class$NSDate">NSDate</a>*)other;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns whether the receiver is exactly equal to
<var>other</var>, to the limit of the NSTimeInterval
precision. <br /> This is the behavior of the
current MacOS-X system, not that of the OpenStep
specification (which counted two dates within
a second of each <var>other</var> as being equal). <br />
The old behavior meant that two dates equal to a third
date were not necessarily equal to each
<var>other</var> (confusing), and meant that there
was no reasonable way to use a date as a dictionary key
or store dates in a set.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate-laterDate$">laterDate: </a></h3>
- (<a rel="gsdoc" href="#class$NSDate">NSDate</a>*) <b>laterDate:</b> (<a rel="gsdoc" href="#class$NSDate">NSDate</a>*)otherDate;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns the earlier of the receiver and
<var>otherDate</var>. <br /> If the two represent
identical date/time values, returns the receiver.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate-timeIntervalSince1970">timeIntervalSince1970 </a></h3>
- (<a rel="gsdoc" href="TypesAndConstants.html#type$NSTimeInterval">NSTimeInterval</a>) <b>timeIntervalSince1970</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns the time interval between the receivers
value and the unix system reference date of 1 January
1970, GMT.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate-timeIntervalSinceDate$">timeIntervalSinceDate: </a></h3>
- (<a rel="gsdoc" href="TypesAndConstants.html#type$NSTimeInterval">NSTimeInterval</a>) <b>timeIntervalSinceDate:</b> (<a rel="gsdoc" href="#class$NSDate">NSDate</a>*)otherDate;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns the time interval between the receivers
value and that of the <var>otherDate</var> argument.
If <var>otherDate</var> is earlier than the receiver,
the returned value will be positive, if it is later it
will be negative. <br /> For current (2011) OSX
compatibility, this method returns NaN if
<var>otherDate</var> is <code>nil</code>... do not
write code depending on that behavior.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate-timeIntervalSinceNow">timeIntervalSinceNow </a></h3>
- (<a rel="gsdoc" href="TypesAndConstants.html#type$NSTimeInterval">NSTimeInterval</a>) <b>timeIntervalSinceNow</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns the time interval between the receivers
value and the current date/time. If the receiver
represents a date/time in the past this will be
negative, if it is in the future the returned
value will be positive.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$NSDate-timeIntervalSinceReferenceDate">timeIntervalSinceReferenceDate </a></h3>
- (<a rel="gsdoc" href="TypesAndConstants.html#type$NSTimeInterval">NSTimeInterval</a>) <b>timeIntervalSinceReferenceDate</b>;<br />
<div class="availability">
<b>Availability:</b> OpenStep</div>
<br />
<div class="desc">
Returns the time interval between the receivers
value and the OpenStep reference date of 1 Jan 2001
GMT.
</div>
<hr width="25%" align="left" />
</div>
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