a - "am" or "pm" A - "AM" or "PM" B - Swatch Internet time d - day of the month, 2 digits with leading zeros; i.e. "01" to "31" D - day of the week, textual, 3 letters; e.g. "Fri" F - month, textual, long; e.g. "January" g - hour, 12-hour format without leading zeros; i.e. "1" to "12" G - hour, 24-hour format without leading zeros; i.e. "0" to "23" h - hour, 12-hour format; i.e. "01" to "12" H - hour, 24-hour format; i.e. "00" to "23" i - minutes; i.e. "00" to "59" I (capital i) - "1" if Daylight Savings Time, "0" otherwise. j - day of the month without leading zeros; i.e. "1" to "31" l (lowercase 'L') - day of the week, textual, long; e.g. "Friday" L - boolean for whether it is a leap year; i.e. "0" or "1" m - month; i.e. "01" to "12" M - month, textual, 3 letters; e.g. "Jan" n - month without leading zeros; i.e. "1" to "12" O - Difference to Greenwich time in hours; e.g. "+0200" r - RFC 822 formatted date; e.g. "Thu, 21 Dec 2000 16:01:07 +0200" (added in PHP 4.0.4) s - seconds; i.e. "00" to "59" S - English ordinal suffix for the day of the month, 2 characters; i.e. "st", "nd", "rd" or "th" t - number of days in the given month; i.e. "28" to "31" T - Timezone setting of this machine; e.g. "EST" or "MDT" U - seconds since the Unix Epoch (January 1 1970 00:00:00 GMT) w - day of the week, numeric, i.e. "0" (Sunday) to "6" (Saturday) W - ISO-8601 week number of year, weeks starting on Monday (added in PHP 4.1.0) Y - year, 4 digits; e.g. "1999" y - year, 2 digits; e.g. "99" z - day of the year; i.e. "0" to "365" Z - timezone offset in seconds (i.e. "-43200" to "43200"). The offset for timezones west of UTC is always negative, and for those east of UTC is always positive.
A - "AM" or "PM"
B - Swatch Internet time
d - day of the month, 2 digits with leading zeros; i.e. "01" to "31"
D - day of the week, textual, 3 letters; e.g. "Fri"
F - month, textual, long; e.g. "January"
g - hour, 12-hour format without leading zeros; i.e. "1" to "12"
G - hour, 24-hour format without leading zeros; i.e. "0" to "23"
h - hour, 12-hour format; i.e. "01" to "12"
H - hour, 24-hour format; i.e. "00" to "23"
i - minutes; i.e. "00" to "59"
I (capital i) - "1" if Daylight Savings Time, "0" otherwise.
j - day of the month without leading zeros; i.e. "1" to "31"
l (lowercase 'L') - day of the week, textual, long; e.g. "Friday"
L - boolean for whether it is a leap year; i.e. "0" or "1"
m - month; i.e. "01" to "12"
M - month, textual, 3 letters; e.g. "Jan"
n - month without leading zeros; i.e. "1" to "12"
O - Difference to Greenwich time in hours; e.g. "+0200"
r - RFC 822 formatted date; e.g. "Thu, 21 Dec 2000 16:01:07 +0200" (added in PHP 4.0.4)
s - seconds; i.e. "00" to "59"
S - English ordinal suffix for the day of the month, 2 characters; i.e. "st", "nd", "rd" or "th"
t - number of days in the given month; i.e. "28" to "31"
T - Timezone setting of this machine; e.g. "EST" or "MDT"
U - seconds since the Unix Epoch (January 1 1970 00:00:00 GMT)
w - day of the week, numeric, i.e. "0" (Sunday) to "6" (Saturday)
W - ISO-8601 week number of year, weeks starting on Monday (added in PHP 4.1.0)
Y - year, 4 digits; e.g. "1999"
y - year, 2 digits; e.g. "99"
z - day of the year; i.e. "0" to "365"
Z - timezone offset in seconds (i.e. "-43200" to "43200"). The offset for timezones west of UTC is always negative, and for those east of UTC is always positive.
<!--
alert(formatdatetime(now(),0))
alert(formatdatetime(now(),1))
alert(formatdatetime(now(),2))
alert(formatdatetime(now(),3))
alert(formatdatetime(now(),4))
//-->
</SCRIPT>与当前系统日期格式设置有关