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strftime
Format a local time/date according to locale settings
Description
string strftime
( string $format
[, int $timestamp = time()
] )
Not all conversion specifiers may be supported by your C library, in which
case they will not be supported by PHP's strftime.
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
Jan 1, 1970 - 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
» MSDN.
Parameters
-
format
-
The following characters are recognized in the
format parameter string
format |
Description |
Example returned values |
| Day |
--- |
--- |
| %a |
An abbreviated textual representation of the day |
Sun through Sat |
| %A |
A full textual representation of the day |
Sunday through Saturday |
| %d |
Two-digit day of the month (with leading zeros) |
01 to 31 |
| %e |
Day of the month, with a space preceding single digits. Not
implemented as described on Windows. See below for more information.
|
1 to 31 |
| %j |
Day of the year, 3 digits with leading zeros |
001 to 366 |
| %u |
ISO-8601 numeric representation of the day of the week |
1 (for Monday) through 7 (for Sunday) |
| %w |
Numeric representation of the day of the week |
0 (for Sunday) through 6 (for Saturday) |
| Week |
--- |
--- |
| %U |
Week number of the given year, starting with the first
Sunday as the first week |
13 (for the 13th full week of the year) |
| %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 |
01 through 53 (where 53
accounts for an overlapping week) |
| %W |
A numeric representation of the week of the year, starting
with the first Monday as the first week |
46 (for the 46th week of the year beginning
with a Monday) |
| Month |
--- |
--- |
| %b |
Abbreviated month name, based on the locale |
Jan through Dec |
| %B |
Full month name, based on the locale |
January through December |
| %h |
Abbreviated month name, based on the locale (an alias of %b) |
Jan through Dec |
| %m |
Two digit representation of the month |
01 (for January) through 12 (for December) |
| Year |
--- |
--- |
| %C |
Two digit representation of the century (year divided by 100, truncated to an integer) |
19 for the 20th Century |
| %g |
Two digit representation of the year going by ISO-8601:1988 standards (see %V) |
Example: 09 for the week of January 6, 2009 |
| %G |
The full four-digit version of %g |
Example: 2008 for the week of January 3, 2009 |
| %y |
Two digit representation of the year |
Example: 09 for 2009, 79 for 1979 |
| %Y |
Four digit representation for the year |
Example: 2038 |
| Time |
--- |
--- |
| %H |
Two digit representation of the hour in 24-hour format |
00 through 23 |
| %k |
Hour in 24-hour format, with a space preceding single digits |
0 through 23 |
| %I |
Two digit representation of the hour in 12-hour format |
01 through 12 |
| %l (lower-case 'L') |
Hour in 12-hour format, with a space preceding single digits |
1 through 12 |
| %M |
Two digit representation of the minute |
00 through 59 |
| %p |
UPPER-CASE 'AM' or 'PM' based on the given time |
Example: AM for 00:31, PM for 22:23 |
| %P |
lower-case 'am' or 'pm' based on the given time |
Example: am for 00:31, pm for 22:23 |
| %r |
Same as "%I:%M:%S %p" |
Example: 09:34:17 PM for 21:34:17 |
| %R |
Same as "%H:%M" |
Example: 00:35 for 12:35 AM, 16:44 for 4:44 PM |
| %S |
Two digit representation of the second |
00 through 59 |
| %T |
Same as "%H:%M:%S" |
Example: 21:34:17 for 09:34:17 PM |
| %X |
Preferred time representation based on locale, without the date |
Example: 03:59:16 or 15:59:16 |
| %z |
The time zone offset. Not implemented as described on
Windows. See below for more information. |
Example: -0500 for US Eastern Time |
| %Z |
The time zone abbreviation. Not implemented as described on
Windows. See below for more information. |
Example: EST for Eastern Time |
| Time and Date Stamps |
--- |
--- |
| %c |
Preferred date and time stamp based on locale |
Example: Tue Feb 5 00:45:10 2009 for
February 5, 2009 at 12:45:10 AM |
| %D |
Same as "%m/%d/%y" |
Example: 02/05/09 for February 5, 2009 |
| %F |
Same as "%Y-%m-%d" (commonly used in database datestamps) |
Example: 2009-02-05 for February 5, 2009 |
| %s |
Unix Epoch Time timestamp (same as the time
function) |
Example: 305815200 for September 10, 1979 08:40:00 AM |
| %x |
Preferred date representation based on locale, without the time |
Example: 02/05/09 for February 5, 2009 |
| Miscellaneous |
--- |
--- |
| %n |
A newline character ("\n") |
--- |
| %t |
A Tab character ("\t") |
--- |
| %% |
A literal percentage character ("%") |
--- |
Maximum length of this parameter is 1023 characters.
Warning
Contrary to ISO-9899:1999, Sun Solaris starts with Sunday as 1. As a
result, %u may not function as described in this
manual.
Warning
Windows only:
The %e modifier is not supported in the Windows
implementation of this function. To achieve this value, the
%#d modifier can be used instead. The example below
illustrates how to write a cross platform compatible function.
The %z and %Z modifiers both
return the time zone name instead of the offset or abbreviation.
Warning
Mac OS X only: The %P modifier
is not supported in the Mac OS X implementation of this function.
-
timestamp
-
The optional timestamp parameter is an
integer Unix timestamp that defaults to the current
local time if a timestamp is not given. In other
words, it defaults to the value of time.
Return Values
Returns a string formatted according format
using the given timestamp 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 setlocale.
Errors/Exceptions
Every call to a date/time function will generate a E_NOTICE
if the time zone is not valid, and/or a E_STRICT
or E_WARNING message
if using the system settings or the TZ environment
variable. See also date_default_timezone_set
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 E_WARNING messages and
return FALSE. On other operating systems you may not get any
E_WARNING messages and the output may contain the
conversion specifiers unconverted.
Examples
This example will work if you have the respective locales installed
in your system.
Example #1 strftime locale examples
<?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");
?>
Example #2 ISO 8601:1988 week number example
<?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";
?>
Example #3 Cross platform compatible example using the %e modifier
<?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);
?>
Example #4 Display all known and unknown formats.
<?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";
}
?>
The above example will output
something similar to:
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'
Notes
Note:
%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.
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