%a - abbreviated weekday name according to the current locale
（根据当地格式输出“星期”缩写格式）
%A - full weekday name according to the current locale
（根据当地格式输出“星期”全称格式）
%b - abbreviated month name according to the current locale
（根据当地格式输出“月”缩写格式）
%B - full month name according to the current locale
（根据当地格式输出“月”全称格式）
%c - preferred date and time representation for the current locale
%C - century number (the year divided by 100 and truncated to an integer, range 00 to 99)
%d - day of the month as a decimal number (range 00 to 31)
%D - same as %m/%d/%y
%e - day of the month as a decimal number, a single digit is preceded by a
space (range 1 to 31)
%g - Week-based year within century [00,99]
%G - Week-based year, including the century [0000,9999]
%h - same as %b
%H - hour as a decimal number using a 24-hour clock (range 00 to 23)
%I - hour as a decimal number using a 12-hour clock (range 01 to 12)
%j - day of the year as a decimal number (range 001 to 366)
%k - Hour (24-hour clock) single digits are preceded by a blank. (range 0 to 23)
%l - hour as a decimal number using a 12-hour clock, single digits preceeded by
a space (range 1 to 12)
%m - month as a decimal number (range 01 to 12)
%M - minute as a decimal number
%n - newline character
%p - either `am' or `pm' according to the given time value, or the corresponding strings for the current locale
%r - time in a.m. and p.m. notation
%R - time in 24 hour notation
%S - second as a decimal number
%t - tab character
%T - current time, equal to %H:%M:%S
%u - weekday as a decimal number [1,7], with 1 representing Monday
%U - week number of the current year as a decimal number, starting with the first Sunday as the first day of the first week
%V - The ISO 8601:1988 week number of the current year as a decimal number, range 01 to 53, where week 1
is the first week that has at least 4 days in the current year, and with Monday as the first day of the week.
%w - day of the week as a decimal, Sunday being 0
%W - week number of the current year as a decimal number, starting with the first Monday as the first day of the first week
%x - preferred date representation for the current locale without the time
%X - preferred time representation for the current locale without the date
%y - year as a decimal number without a century (range 00 to 99)
%Y - year as a decimal number including the century
%Z - time zone or name or abbreviation
%% - a literal `%' character
PROGRAMMERS NOTE: date_format is essentially a wrapper to PHP's strftime()
function. You may have more or less conversion specifiers available depending
on your system's strftime() function where PHP was compiled. Check your
system's manpage for a full list of valid specifiers.
程序员提示:date_format本质上是php的strftime()函数的一个包装。
当php被编译的时候你可以或多或少的依靠系统
的strftime()转换有效的区分符。
可以查看系统手册的有效区分符的全表.
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