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|
<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.strftime" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>strftime</refname>
<refpurpose>Format a local time/date according to locale settings</refpurpose>
</refnamediv>
<refsynopsisdiv>
&warn.deprecated.function-8-1-0.alternatives;
<simplelist role="alternatives">
<member><function>date</function></member>
<member><methodname>IntlDateFormatter::format</methodname></member>
</simplelist>
</refsynopsisdiv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<modifier role="attribute">#[\Deprecated]</modifier>
<type class="union"><type>string</type><type>false</type></type><methodname>strftime</methodname>
<methodparam><type>string</type><parameter>format</parameter></methodparam>
<methodparam choice="opt"><type class="union"><type>int</type><type>null</type></type><parameter>timestamp</parameter><initializer>&null;</initializer></methodparam>
</methodsynopsis>
<para>
Format the time and/or date according to locale settings. Month and weekday
names and other language-dependent strings respect the current locale set
with <function>setlocale</function>.
</para>
<warning>
<para>
Not all conversion specifiers may be supported by your C library, in which
case they will not be supported by PHP's <function>strftime</function>.
Additionally, not all platforms support negative timestamps, so your
date range may be limited to no earlier than the Unix epoch. This means that
%e, %T, %R and, %D (and possibly others) - as well as dates prior to
<literal>Jan 1, 1970</literal> - will not work on Windows, some Linux
distributions, and a few other operating systems. For Windows systems, a
complete overview of supported conversion specifiers can be found at
<link xlink:href="&url.strftime.win32;"><acronym>MSDN</acronym></link>.
Instead use the
<methodname>IntlDateFormatter::format</methodname> method.
</para>
</warning>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>format</parameter></term>
<listitem>
<para>
<table>
<title>The following characters are recognized in the
<parameter>format</parameter> parameter string</title>
<tgroup cols="3">
<thead>
<row>
<entry><parameter>format</parameter></entry>
<entry>Description</entry>
<entry>Example returned values</entry>
</row>
</thead>
<tbody>
<row>
<entry align="center"><emphasis>Day</emphasis></entry>
<entry>---</entry>
<entry>---</entry>
</row>
<row>
<entry><literal>%a</literal></entry>
<entry>An abbreviated textual representation of the day</entry>
<entry><literal>Sun</literal> through <literal>Sat</literal></entry>
</row>
<row>
<entry><literal>%A</literal></entry>
<entry>A full textual representation of the day</entry>
<entry><literal>Sunday</literal> through <literal>Saturday</literal></entry>
</row>
<row>
<entry><literal>%d</literal></entry>
<entry>Two-digit day of the month (with leading zeros)</entry>
<entry><literal>01</literal> to <literal>31</literal></entry>
</row>
<row>
<entry><literal>%e</literal></entry>
<entry>
Day of the month, with a space preceding single digits. Not
implemented as described on Windows. See below for more information.
</entry>
<entry><literal> 1</literal> to <literal>31</literal></entry>
</row>
<row>
<entry><literal>%j</literal></entry>
<entry>Day of the year, 3 digits with leading zeros</entry>
<entry><literal>001</literal> to <literal>366</literal></entry>
</row>
<row>
<entry><literal>%u</literal></entry>
<entry>ISO-8601 numeric representation of the day of the week</entry>
<entry><literal>1</literal> (for Monday) through <literal>7</literal> (for Sunday)</entry>
</row>
<row>
<entry><literal>%w</literal></entry>
<entry>Numeric representation of the day of the week</entry>
<entry><literal>0</literal> (for Sunday) through <literal>6</literal> (for Saturday)</entry>
</row>
<row>
<entry align="center"><emphasis>Week</emphasis></entry>
<entry>---</entry>
<entry>---</entry>
</row>
<row>
<entry><literal>%U</literal></entry>
<entry>Week number of the given year, starting with the first
Sunday as the first week</entry>
<entry><literal>13</literal> (for the 13th full week of the year)</entry>
</row>
<row>
<entry><literal>%V</literal></entry>
<entry>ISO-8601:1988 week number of the given year, starting with
the first week of the year with at least 4 weekdays, with Monday
being the start of the week</entry>
<entry><literal>01</literal> through <literal>53</literal> (where 53
accounts for an overlapping week)</entry>
</row>
<row>
<entry><literal>%W</literal></entry>
<entry>A numeric representation of the week of the year, starting
with the first Monday as the first week</entry>
<entry><literal>46</literal> (for the 46th week of the year beginning
with a Monday)</entry>
</row>
<row>
<entry align="center"><emphasis>Month</emphasis></entry>
<entry>---</entry>
<entry>---</entry>
</row>
<row>
<entry><literal>%b</literal></entry>
<entry>Abbreviated month name, based on the locale</entry>
<entry><literal>Jan</literal> through <literal>Dec</literal></entry>
</row>
<row>
<entry><literal>%B</literal></entry>
<entry>Full month name, based on the locale</entry>
<entry><literal>January</literal> through <literal>December</literal></entry>
</row>
<row>
<entry><literal>%h</literal></entry>
<entry>Abbreviated month name, based on the locale (an alias of %b)</entry>
<entry><literal>Jan</literal> through <literal>Dec</literal></entry>
</row>
<row>
<entry><literal>%m</literal></entry>
<entry>Two digit representation of the month</entry>
<entry><literal>01</literal> (for January) through <literal>12</literal> (for December)</entry>
</row>
<row>
<entry align="center"><emphasis>Year</emphasis></entry>
<entry>---</entry>
<entry>---</entry>
</row>
<row>
<entry><literal>%C</literal></entry>
<entry>Two digit representation of the century (year divided by 100, truncated to an integer)</entry>
<entry><literal>19</literal> for the 20th Century</entry>
</row>
<row>
<entry><literal>%g</literal></entry>
<entry>Two digit representation of the year going by ISO-8601:1988 standards (see %V)</entry>
<entry>Example: <literal>09</literal> for the week of January 6, 2009</entry>
</row>
<row>
<entry><literal>%G</literal></entry>
<entry>The full four-digit version of %g</entry>
<entry>Example: <literal>2008</literal> for the week of January 3, 2009</entry>
</row>
<row>
<entry><literal>%y</literal></entry>
<entry>Two digit representation of the year</entry>
<entry>Example: <literal>09</literal> for 2009, <literal>79</literal> for 1979</entry>
</row>
<row>
<entry><literal>%Y</literal></entry>
<entry>Four digit representation for the year</entry>
<entry>Example: <literal>2038</literal></entry>
</row>
<row>
<entry align="center"><emphasis>Time</emphasis></entry>
<entry>---</entry>
<entry>---</entry>
</row>
<row>
<entry><literal>%H</literal></entry>
<entry>Two digit representation of the hour in 24-hour format</entry>
<entry><literal>00</literal> through <literal>23</literal></entry>
</row>
<row>
<entry><literal>%k</literal></entry>
<entry>Hour in 24-hour format, with a space preceding single digits</entry>
<entry><literal> 0</literal> through <literal>23</literal></entry>
</row>
<row>
<entry><literal>%I</literal></entry>
<entry>Two digit representation of the hour in 12-hour format</entry>
<entry><literal>01</literal> through <literal>12</literal></entry>
</row>
<row>
<entry><literal>%l (lower-case 'L')</literal></entry>
<entry>Hour in 12-hour format, with a space preceding single digits</entry>
<entry><literal> 1</literal> through <literal>12</literal></entry>
</row>
<row>
<entry><literal>%M</literal></entry>
<entry>Two digit representation of the minute</entry>
<entry><literal>00</literal> through <literal>59</literal></entry>
</row>
<row>
<entry><literal>%p</literal></entry>
<entry>UPPER-CASE 'AM' or 'PM' based on the given time</entry>
<entry>Example: <literal>AM</literal> for 00:31,
<literal>PM</literal> for 22:23. The exact result depends on the
Operating System, and they can also return lower-case variants, or
variants with dots (such as <literal>a.m.</literal>).</entry>
</row>
<row>
<entry><literal>%P</literal></entry>
<entry>lower-case 'am' or 'pm' based on the given time</entry>
<entry>Example: <literal>am</literal> for 00:31,
<literal>pm</literal> for 22:23. Not supported by all Operating
Systems.</entry>
</row>
<row>
<entry><literal>%r</literal></entry>
<entry>Same as "%I:%M:%S %p"</entry>
<entry>Example: <literal>09:34:17 PM</literal> for 21:34:17</entry>
</row>
<row>
<entry><literal>%R</literal></entry>
<entry>Same as "%H:%M"</entry>
<entry>Example: <literal>00:35</literal> for 12:35 AM, <literal>16:44</literal> for 4:44 PM</entry>
</row>
<row>
<entry><literal>%S</literal></entry>
<entry>Two digit representation of the second</entry>
<entry><literal>00</literal> through <literal>59</literal></entry>
</row>
<row>
<entry><literal>%T</literal></entry>
<entry>Same as "%H:%M:%S"</entry>
<entry>Example: <literal>21:34:17</literal> for 09:34:17 PM</entry>
</row>
<row>
<entry><literal>%X</literal></entry>
<entry>Preferred time representation based on locale, without the date</entry>
<entry>Example: <literal>03:59:16</literal> or <literal>15:59:16</literal></entry>
</row>
<row>
<entry><literal>%z</literal></entry>
<entry>The time zone offset. Not implemented as described on
Windows. See below for more information.</entry>
<entry>Example: <literal>-0500</literal> for US Eastern Time</entry>
</row>
<row>
<entry><literal>%Z</literal></entry>
<entry>The time zone abbreviation. Not implemented as described on
Windows. See below for more information.</entry>
<entry>Example: <literal>EST</literal> for Eastern Time</entry>
</row>
<row>
<entry align="center"><emphasis>Time and Date Stamps</emphasis></entry>
<entry>---</entry>
<entry>---</entry>
</row>
<row>
<entry><literal>%c</literal></entry>
<entry>Preferred date and time stamp based on locale</entry>
<entry>Example: <literal>Tue Feb 5 00:45:10 2009</literal> for
February 5, 2009 at 12:45:10 AM</entry>
</row>
<row>
<entry><literal>%D</literal></entry>
<entry>Same as "%m/%d/%y"</entry>
<entry>Example: <literal>02/05/09</literal> for February 5, 2009</entry>
</row>
<row>
<entry><literal>%F</literal></entry>
<entry>Same as "%Y-%m-%d" (commonly used in database datestamps)</entry>
<entry>Example: <literal>2009-02-05</literal> for February 5, 2009</entry>
</row>
<row>
<entry><literal>%s</literal></entry>
<entry>Unix Epoch Time timestamp (same as the <function>time</function>
function)</entry>
<entry>Example: <literal>305815200</literal> for September 10, 1979 08:40:00 AM</entry>
</row>
<row>
<entry><literal>%x</literal></entry>
<entry>Preferred date representation based on locale, without the time</entry>
<entry>Example: <literal>02/05/09</literal> for February 5, 2009</entry>
</row>
<row>
<entry align="center"><emphasis>Miscellaneous</emphasis></entry>
<entry>---</entry>
<entry>---</entry>
</row>
<row>
<entry><literal>%n</literal></entry>
<entry>A newline character ("\n")</entry>
<entry>---</entry>
</row>
<row>
<entry><literal>%t</literal></entry>
<entry>A Tab character ("\t")</entry>
<entry>---</entry>
</row>
<row>
<entry><literal>%%</literal></entry>
<entry>A literal percentage character ("%")</entry>
<entry>---</entry>
</row>
</tbody>
</tgroup>
</table>
</para>
<warning>
<simpara>
Contrary to ISO-9899:1999, Sun Solaris starts with Sunday as 1. As a
result, <literal>%u</literal> may not function as described in this
manual.
</simpara>
</warning>
<warning>
<para>
<emphasis>Windows only:</emphasis>
</para>
<para>
The <literal>%e</literal> modifier is not supported in the Windows
implementation of this function. To achieve this value, the
<literal>%#d</literal> modifier can be used instead. The example below
illustrates how to write a cross platform compatible function.
</para>
<para>
The <literal>%z</literal> and <literal>%Z</literal> modifiers both
return the time zone name instead of the offset or abbreviation.
</para>
</warning>
<warning>
<simpara>
<emphasis>macOS and musl only:</emphasis> The <literal>%P</literal> modifier
is not supported in the macOS implementation of this function.
</simpara>
</warning>
</listitem>
</varlistentry>
&date.timestamp.description;
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns a string formatted according <parameter>format</parameter>
using the given <parameter>timestamp</parameter> or the current
local time if no timestamp is given. Month and weekday names and
other language-dependent strings respect the current locale set
with <function>setlocale</function>.
The function returns &false; if <parameter>format</parameter> is empty, contains unsupported
conversion specifiers, or if the length of the returned string would be greater than
<literal>4095</literal>.
</para>
</refsect1>
<refsect1 role="errors">
&reftitle.errors;
&date.timezone.errors.description;
<para>
As the output is dependent upon the underlying C library, some conversion
specifiers are not supported. On Windows, supplying unknown conversion
specifiers will result in 5 <constant>E_WARNING</constant> messages and
return &false;. On other operating systems you may not get any
<constant>E_WARNING</constant> messages and the output may contain the
conversion specifiers unconverted.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>8.0.0</entry>
<entry>
<parameter>timestamp</parameter> is nullable now.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
This example will work if you have the respective locales installed
in your system.
<example>
<title><function>strftime</function> locale examples</title>
<programlisting role="php">
<![CDATA[
<?php
setlocale(LC_TIME, "C");
echo strftime("%A");
setlocale(LC_TIME, "fi_FI");
echo strftime(" in Finnish is %A,");
setlocale(LC_TIME, "fr_FR");
echo strftime(" in French %A and");
setlocale(LC_TIME, "de_DE");
echo strftime(" in German %A.\n");
?>
]]>
</programlisting>
</example>
</para>
<para>
<example>
<title>ISO 8601:1988 week number example</title>
<programlisting role="php">
<![CDATA[
<?php
/* December 2002 / January 2003
ISOWk M Tu W Thu F Sa Su
----- ----------------------------
51 16 17 18 19 20 21 22
52 23 24 25 26 27 28 29
1 30 31 1 2 3 4 5
2 6 7 8 9 10 11 12
3 13 14 15 16 17 18 19 */
// Outputs: 12/28/2002 - %V,%G,%Y = 52,2002,2002
echo "12/28/2002 - %V,%G,%Y = " . strftime("%V,%G,%Y", strtotime("12/28/2002")) . "\n";
// Outputs: 12/30/2002 - %V,%G,%Y = 1,2003,2002
echo "12/30/2002 - %V,%G,%Y = " . strftime("%V,%G,%Y", strtotime("12/30/2002")) . "\n";
// Outputs: 1/3/2003 - %V,%G,%Y = 1,2003,2003
echo "1/3/2003 - %V,%G,%Y = " . strftime("%V,%G,%Y",strtotime("1/3/2003")) . "\n";
// Outputs: 1/10/2003 - %V,%G,%Y = 2,2003,2003
echo "1/10/2003 - %V,%G,%Y = " . strftime("%V,%G,%Y",strtotime("1/10/2003")) . "\n";
/* December 2004 / January 2005
ISOWk M Tu W Thu F Sa Su
----- ----------------------------
51 13 14 15 16 17 18 19
52 20 21 22 23 24 25 26
53 27 28 29 30 31 1 2
1 3 4 5 6 7 8 9
2 10 11 12 13 14 15 16 */
// Outputs: 12/23/2004 - %V,%G,%Y = 52,2004,2004
echo "12/23/2004 - %V,%G,%Y = " . strftime("%V,%G,%Y",strtotime("12/23/2004")) . "\n";
// Outputs: 12/31/2004 - %V,%G,%Y = 53,2004,2004
echo "12/31/2004 - %V,%G,%Y = " . strftime("%V,%G,%Y",strtotime("12/31/2004")) . "\n";
// Outputs: 1/2/2005 - %V,%G,%Y = 53,2004,2005
echo "1/2/2005 - %V,%G,%Y = " . strftime("%V,%G,%Y",strtotime("1/2/2005")) . "\n";
// Outputs: 1/3/2005 - %V,%G,%Y = 1,2005,2005
echo "1/3/2005 - %V,%G,%Y = " . strftime("%V,%G,%Y",strtotime("1/3/2005")) . "\n";
?>
]]>
</programlisting>
</example>
</para>
<para>
<example>
<title>Cross platform compatible example using the <literal>%e</literal> modifier</title>
<programlisting role="php">
<![CDATA[
<?php
// Jan 1: results in: '%e%1%' (%%, e, %%, %e, %%)
$format = '%%e%%%e%%';
// Check for Windows to find and replace the %e
// modifier correctly
if (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN') {
$format = preg_replace('#(?<!%)((?:%%)*)%e#', '\1%#d', $format);
}
echo strftime($format);
?>
]]>
</programlisting>
</example>
</para>
<para>
<example>
<title>Display all known and unknown formats</title>
<programlisting role="php">
<![CDATA[
<?php
// Describe the formats
$strftimeFormats = array(
'A' => 'A full textual representation of the day',
'B' => 'Full month name, based on the locale',
'C' => 'Two digit representation of the century (year divided by 100, truncated to an integer)',
'D' => 'Same as "%m/%d/%y"',
'E' => '',
'F' => 'Same as "%Y-%m-%d"',
'G' => 'The full four-digit version of %g',
'H' => 'Two digit representation of the hour in 24-hour format',
'I' => 'Two digit representation of the hour in 12-hour format',
'J' => '',
'K' => '',
'L' => '',
'M' => 'Two digit representation of the minute',
'N' => '',
'O' => '',
'P' => 'lower-case "am" or "pm" based on the given time',
'Q' => '',
'R' => 'Same as "%H:%M"',
'S' => 'Two digit representation of the second',
'T' => 'Same as "%H:%M:%S"',
'U' => 'Week number of the given year, starting with the first Sunday as the first week',
'V' => 'ISO-8601:1988 week number of the given year, starting with the first week of the year with at least 4 weekdays, with Monday being the start of the week',
'W' => 'A numeric representation of the week of the year, starting with the first Monday as the first week',
'X' => 'Preferred time representation based on locale, without the date',
'Y' => 'Four digit representation for the year',
'Z' => 'The time zone offset/abbreviation option NOT given by %z (depends on operating system)',
'a' => 'An abbreviated textual representation of the day',
'b' => 'Abbreviated month name, based on the locale',
'c' => 'Preferred date and time stamp based on local',
'd' => 'Two-digit day of the month (with leading zeros)',
'e' => 'Day of the month, with a space preceding single digits',
'f' => '',
'g' => 'Two digit representation of the year going by ISO-8601:1988 standards (see %V)',
'h' => 'Abbreviated month name, based on the locale (an alias of %b)',
'i' => '',
'j' => 'Day of the year, 3 digits with leading zeros',
'k' => 'Hour in 24-hour format, with a space preceding single digits',
'l' => 'Hour in 12-hour format, with a space preceding single digits',
'm' => 'Two digit representation of the month',
'n' => 'A newline character ("\n")',
'o' => '',
'p' => 'UPPER-CASE "AM" or "PM" based on the given time',
'q' => '',
'r' => 'Same as "%I:%M:%S %p"',
's' => 'Unix Epoch Time timestamp',
't' => 'A Tab character ("\t")',
'u' => 'ISO-8601 numeric representation of the day of the week',
'v' => '',
'w' => 'Numeric representation of the day of the week',
'x' => 'Preferred date representation based on locale, without the time',
'y' => 'Two digit representation of the year',
'z' => 'Either the time zone offset from UTC or the abbreviation (depends on operating system)',
'%' => 'A literal percentage character ("%")',
);
// Results
$strftimeValues = array();
// Evaluate the formats whilst suppressing any errors
foreach ($strftimeFormats as $format => $description) {
if (false !== ($value = @strftime("%{$format}"))) {
$strftimeValues[$format] = $value;
}
}
// Find the longest value
$maxValueLength = 2 + max(array_map('strlen', $strftimeValues));
// Report known formats
foreach ($strftimeValues as $format => $value) {
echo "Known format : '{$format}' = ", str_pad("'{$value}'", $maxValueLength), " ( {$strftimeFormats[$format]} )\n";
}
// Report unknown formats
foreach (array_diff_key($strftimeFormats, $strftimeValues) as $format => $description) {
echo "Unknown format : '{$format}' ", str_pad(' ', $maxValueLength), ($description ? " ( {$description} )" : ''), "\n";
}
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
<![CDATA[
Known format : 'A' = 'Friday' ( A full textual representation of the day )
Known format : 'B' = 'December' ( Full month name, based on the locale )
Known format : 'H' = '11' ( Two digit representation of the hour in 24-hour format )
Known format : 'I' = '11' ( Two digit representation of the hour in 12-hour format )
Known format : 'M' = '24' ( Two digit representation of the minute )
Known format : 'S' = '44' ( Two digit representation of the second )
Known format : 'U' = '48' ( Week number of the given year, starting with the first Sunday as the first week )
Known format : 'W' = '48' ( A numeric representation of the week of the year, starting with the first Monday as the first week )
Known format : 'X' = '11:24:44' ( Preferred time representation based on locale, without the date )
Known format : 'Y' = '2010' ( Four digit representation for the year )
Known format : 'Z' = 'GMT Standard Time' ( The time zone offset/abbreviation option NOT given by %z (depends on operating system) )
Known format : 'a' = 'Fri' ( An abbreviated textual representation of the day )
Known format : 'b' = 'Dec' ( Abbreviated month name, based on the locale )
Known format : 'c' = '12/03/10 11:24:44' ( Preferred date and time stamp based on local )
Known format : 'd' = '03' ( Two-digit day of the month (with leading zeros) )
Known format : 'j' = '337' ( Day of the year, 3 digits with leading zeros )
Known format : 'm' = '12' ( Two digit representation of the month )
Known format : 'p' = 'AM' ( UPPER-CASE "AM" or "PM" based on the given time )
Known format : 'w' = '5' ( Numeric representation of the day of the week )
Known format : 'x' = '12/03/10' ( Preferred date representation based on locale, without the time )
Known format : 'y' = '10' ( Two digit representation of the year )
Known format : 'z' = 'GMT Standard Time' ( Either the time zone offset from UTC or the abbreviation (depends on operating system) )
Known format : '%' = '%' ( A literal percentage character ("%") )
Unknown format : 'C' ( Two digit representation of the century (year divided by 100, truncated to an integer) )
Unknown format : 'D' ( Same as "%m/%d/%y" )
Unknown format : 'E'
Unknown format : 'F' ( Same as "%Y-%m-%d" )
Unknown format : 'G' ( The full four-digit version of %g )
Unknown format : 'J'
Unknown format : 'K'
Unknown format : 'L'
Unknown format : 'N'
Unknown format : 'O'
Unknown format : 'P' ( lower-case "am" or "pm" based on the given time )
Unknown format : 'Q'
Unknown format : 'R' ( Same as "%H:%M" )
Unknown format : 'T' ( Same as "%H:%M:%S" )
Unknown format : 'V' ( ISO-8601:1988 week number of the given year, starting with the first week of the year with at least 4 weekdays, with Monday being the start of the week )
Unknown format : 'e' ( Day of the month, with a space preceding single digits )
Unknown format : 'f'
Unknown format : 'g' ( Two digit representation of the year going by ISO-8601:1988 standards (see %V) )
Unknown format : 'h' ( Abbreviated month name, based on the locale (an alias of %b) )
Unknown format : 'i'
Unknown format : 'k' ( Hour in 24-hour format, with a space preceding single digits )
Unknown format : 'l' ( Hour in 12-hour format, with a space preceding single digits )
Unknown format : 'n' ( A newline character ("\n") )
Unknown format : 'o'
Unknown format : 'q'
Unknown format : 'r' ( Same as "%I:%M:%S %p" )
Unknown format : 's' ( Unix Epoch Time timestamp )
Unknown format : 't' ( A Tab character ("\t") )
Unknown format : 'u' ( ISO-8601 numeric representation of the day of the week )
Unknown format : 'v'
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<note>
<simpara>
%G and %V, which are based on ISO 8601:1988 week numbers can
give unexpected (albeit correct) results if the numbering system
is not thoroughly understood. See %V examples in this manual page.
</simpara>
</note>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><methodname>IntlDateFormatter::format</methodname></member>
<member><methodname>DateTimeInterface::format</methodname></member>
<member><link xlink:href="&url.strftime.format.designer;">Online strftime() format design tool</link></member>
<member><function>setlocale</function></member>
<member><function>mktime</function></member>
<member><function>strptime</function></member>
<member><function>gmstrftime</function></member>
<member><link xlink:href="&spec.strftime;">Open Group specification of <function>strftime</function></link></member>
</simplelist>
</para>
</refsect1>
</refentry>
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