string
date ( string format [, int
timestamp])
Returns a string formatted according to the given format
string using the given integer
timestamp or the current local time if no timestamp
is given. In otherwords,
timestamp is optional and defaults to the value of
time().
注: The valid range of a timestamp is typically
from Fri, 13 Dec 1901 20:45:54 GMT to Tue, 19 Jan 2038
03:14:07 GMT. (These are the dates that correspond to the
minimum and maximum values for a 32-bit signed integer).
On windows this range is limited from 01-01-1970 to
19-01-2038.
To generate a timestamp from a string representation
of the date, you may be able to use
strtotime(). Additionally, some databases have
functions to convert their date formats into timestamps
(such as MySQL's UNIX_TIMESTAMP function).
表格 1. The following characters are recognized in the
format parameter
string
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Day of the month, 2
digits with leading zeros |
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A textual
representation of a week, three letters |
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A full textual
representation of a month, such as January or
March |
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I (capital i) |
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1 if Daylight Savings Time,
0 otherwise. |
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l (lowercase 'L') |
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Whether it's a leap
year |
1 if it is a leap year,
0 otherwise. |
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Numeric
representation of a month, with leading zeros |
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A short textual
representation of a month, three letters |
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Numeric
representation of a month, without leading zeros |
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Difference to
Greenwich time (GMT) in hours |
Example: +0200 |
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Example: Thu, 21 Dec 2000 16:01:07 +0200 |
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Seconds, with
leading zeros |
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English ordinal
suffix for the day of the month, 2 characters |
st, nd, rd or
th. Works well with
j |
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Examples: EST, MDT
... |
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Seconds since the
Unix Epoch (January 1 1970 00:00:00 GMT) |
See also
time() |
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0 (for Sunday) through
6 (for Saturday) |
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ISO-8601 week number
of year, weeks starting on Monday (added in PHP
4.1.0) |
Example: 42 (the 42nd week in the year) |
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A full numeric
representation of a year, 4 digits |
Examples: 1999 or
2003 |
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Examples: 99 or 03 |
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Timezone offset in
seconds. The offset for timezones west of UTC is
always negative, and for those east of UTC is always
positive. |
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Unrecognized characters in the format string will be
printed as-is. The Z format will
always return 0 when using
gmdate().
範例 1. date()
examples
?php
// Prints something like: Wednesday
echo date("l");
// Prints something like: Wednesday 15th of January 2003 05:51:38 AM
echo date ("l dS of F Y h:i:s A");
// Prints: July 1, 2000 is on a Saturday
echo "July 1, 2000 is on a " . date ("l", mktime(0,0,0,7,1,2000));
?
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You can prevent a recognized character in the format
string from being expanded by escaping it with a preceding
backslash. If the character with a backslash is already a
special sequence, you may need to also escape the
backslash.
範例 2. Escaping characters in date()
?php
// prints something like: Wednesday the 15th
echo date("l \\t\h\e jS");
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It is possible to use date() and
mktime() together to find dates in the future or the
past.
範例 3. date() and
mktime() example
?php
$tomorrow = mktime (0,0,0,date("m") ,date("d")+1,date("Y"));
$lastmonth = mktime (0,0,0,date("m")-1,date("d"), date("Y"));
$nextyear = mktime (0,0,0,date("m"), date("d"), date("Y")+1);
?
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注: This can be more reliable than simply adding
or subtracting the number of seconds in a day or month to
a timestamp because of daylight savings time.
Some examples of date()
formatting. Note that you should escape any other characters,
as any which currently have a special meaning will produce
undesirable results, and other characters may be assigned
meaning in future PHP versions. When escaping, be sure to use
single quotes to prevent characters like \n from becoming
newlines.
範例 4. date()
Formatting
?php
// Assuming today is: March 10th, 2001, 5:16:18 pm
$today = date("F j, Y, g:i a"); // March 10, 2001, 5:16 pm
$today = date("m.d.y"); // 03.10.01
$today = date("j, n, Y"); // 10, 3, 2001
$today = date("Ymd"); // 20010310
$today = date('h-i-s, j-m-y, it is w Day z '); // 05-16-17, 10-03-01, 1631 1618 6 Fripm01
$today = date('\i\t \i\s \t\h\e jS \d\a\y.'); // It is the 10th day.
$today = date("D M j G:i:s T Y"); // Sat Mar 10 15:16:08 MST 2001
$today = date('H:m:s \m \i\s\ \m\o\n\t\h'); // 17:03:17 m is month
$today = date("H:i:s"); // 17:16:17
?
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To format dates in other languages, you should use the
setlocale() and strftime() functions.
See also getlastmod(), gmdate(),
mktime(), strftime() and time().