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HomeBackend DevelopmentPHP TutorialPHP函数之日期时间函数date()使用详解_PHP

日期时间函数是PHP 的核心组成部分。无需安装即可使用这些函数。下面来详细说说date函数的具体用法:

PHP Date() 函数
PHP Date() 函数可把时间戳格式化为可读性更好的日期和时间。

语法
date(format,timestamp)

format 必需。规定时间戳的格式。
timestamp 可选。规定时间戳。默认是当前的日期和时间。


PHP的日期时间函数date()

复制代码 代码如下:
$t=time();
echo date("Y-m-d H:i:s",$t);
 

第一个参数的格式分别表示:
a - "am" 或是 "pm"
A - "AM" 或是 "PM"
d - 几日,二位数字,若不足二位则前面补零; 如: "01" 至 "31"
D - 星期几,三个英文字母; 如: "Fri"
F - 月份,英文全名; 如: "January"
h - 12 小时制的小时; 如: "01" 至 "12"
H - 24 小时制的小时; 如: "00" 至 "23"
g - 12 小时制的小时,不足二位不补零; 如: "1" 至 12"
G - 24 小时制的小时,不足二位不补零; 如: "0" 至 "23"
i - 分钟; 如: "00" 至 "59"
j - 几日,二位数字,若不足二位不补零; 如: "1" 至 "31"
l - 星期几,英文全名; 如: "Friday"
m - 月份,二位数字,若不足二位则在前面补零; 如: "01" 至 "12"
n - 月份,二位数字,若不足二位则不补零; 如: "1" 至 "12"
M - 月份,三个英文字母; 如: "Jan"
s - 秒; 如: "00" 至 "59"
S - 字尾加英文序数,二个英文字母; 如: "th","nd"
t - 指定月份的天数; 如: "28" 至 "31"
U - 总秒数
w - 数字型的星期几,如: "0" (星期日) 至 "6" (星期六)
Y - 年,四位数字; 如: "1999"
y - 年,二位数字; 如: "99"
z - 一年中的第几天; 如: "0" 至 "365"
其它不在上列的字符则直接列出该字符

1,年-月-日

复制代码 代码如下:
echo date('Y-m-j');
2007-02-6

echo date('y-n-j');
07-2-6


大写Y表示年四位数字,而小写y表示年的两位数字;
小写m表示月份的数字(带前导),而小写n则表示不带前导的月份数字。

复制代码 代码如下:
echo date('Y-M-j');
2007-Feb-6

echo date('Y-m-d');
2007-02-06

大写M表示月份的3个缩写字符,而小写m则表示月份的数字(带前导0);
没有大写的J,只有小写j表示月份的日期,无前导o;若需要月份带前导则使用小写d。

复制代码 代码如下:
echo date('Y-M-j');
2007-Feb-6

echo date('Y-F-jS');
2007-February-6th


大写M表示月份的3个缩写字符,而大写F表示月份的英文全写。(没有小写f)
大写S表示日期的后缀,比如“st”、“nd”、“rd”和“th”,具体看日期数字为何。

小结:
表示年可以用大写的Y和小写y;
表示月可以用大写F、大写M、小写m和小写n(分别表示字符和数字的两种方式);
表示日可以用小写d和小写j,大写S表示日期的后缀。

 
2,时:分:秒

默认情况下,PHP解释显示的时间为“格林威治标准时间”,与我们本地的时间相差8个小时。

复制代码 代码如下:
echo date('g:i:s a');
5:56:57 am

echo date('h:i:s A');
05:56:57 AM

小写g表示12小时制,无前导0,而小写h则表示有前导0的12小时制。
当使用12小时制时需要表明上下午,小写a表示小写的“am”和“pm”,大写A表示大写的“AM”和“PM”。

复制代码 代码如下:
echo date('G:i:s');
14:02:26

大写G表示24小时制的小时数,但是不带前导的;使用大写的H表示带前导的24小时制小时数

小结:
字母g表示小时不带前导,字母h表示小时带前导;
小写g、h表示12小时制,大写G、H表示24小时制。

3,闰年、星期、天

复制代码 代码如下:
echo date('L');
今年是否闰年:0

echo date('l');
今天是:Tuesday

echo date('D');
今天是:Tue

大写L表示判断今年是否闰年,布尔值,为真返回1,否则为0;
小写l表示当天是星期几的英文全写(Tuesday);
而使用大写D表示星期几的3个字符缩写(Tue)。

复制代码 代码如下:
echo date('w');

今天星期:2

复制代码 代码如下:
echo date('W');

本周是全年中的第 06 周

小写w表示星期几,数字形式表示
大写W表示一年中的星期数

复制代码 代码如下:
echo date('t');

本月是 28 天

复制代码 代码如下:
echo date('z');

今天是今年的第 36 天

小写t表示当前月份又多少天
小写z表示今天是本年中第几天

4,其他

复制代码 代码如下:
echo date('T');
UTC

大写T表示服务器的时间区域设置

复制代码 代码如下:
echo date('I');
0

大写I表示判断当前是否为夏令时,为真返回1,否则为0

复制代码 代码如下:
echo date('U');
1170769424

大写U表示从1970年1月1日到现在的总秒数,就是Unix时间纪元的UNIX时间戳。

复制代码 代码如下:
echo date('c');
2007-02-06T14:24:43+00:00

小写c表示ISO8601日期,日期格式为YYYY-MM-DD,用字母T来间隔日期和时间,时间格式为HH:MM:SS,时区使用格林威治标准时间(GMT)的偏差来表示。

复制代码 代码如下:
echo date('r');
Tue, 06 Feb 2007 14:25:52 +0000

小写r表示RFC822日期。

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