Using Date and Time Functions in PHP_PHP Tutorial

(1)date
Usage:
date(format,[time]);
If there is no time parameter, the current time is used.
Format is a string, where The following characters have special meanings:
U is replaced by the number of seconds since a starting time (like January 1, 1970)
Y is replaced by the 4-digit year number.
y is replaced by 2-digit year number.
F is replaced with the full English name of the month.
M is replaced with the English abbreviation of the month.
m is replaced with the number of months.
z is replaced with since January 1 of the current year. The number of days.
d Replace with the number of days.
l Replace with the full English name of the day of the week.
D Replace with the English abbreviation of the day of the week.
w Replace with the day of the week (number).
H is replaced with hours (24-hour format).
h is replaced with hours (12-hour format).
i is replaced with minutes.
s is replaced with seconds.
A is replaced with " AM" or "PM".
a is replaced with "am" or "pm".
S is replaced with an ordinal suffix, such as: "st", "nd", "rd", "th".
The function returns the replaced format string.
(2)getdate(time)
Returns a hash table, each subscript is:
"seconds" -- the number of seconds
" minutes" -- fraction
"hours" -- number of hours
"mday" -- number of days
"mon" -- number of months
"year" -- number of years
"yday" -- The number of days since January 1st
"weekday" -- The day of the week, the full English name
"month" -- The month, the full English name
(3) gmdate
is similar to date, but First convert the time to Greenwich Mean Time.
(4)mktime
Usage:
mktime (hours, minutes, seconds, month, day, year);
Returns a time value, Can be used for other functions.
(5)time
Usage:
time();
Returns the number of seconds since midnight on January 1, 1970.
(6)microtime
Usage:
microtime();
Returns a string, divided into two parts with spaces, the latter part is equivalent to the return value of time()
, and the former part is the number of microseconds.
(7) checkdate
Usage:
checkdate(month, day, year);
Returns logical true or logical false.
If:
[1] The year is between 1900 and 32767 (including 1900 and 32767);
[2] The month is between 1 and 12;
[3] The day is within the allowed number of days in the month (leap years are taken into account);
returns logical true.
( 8)set_time_limit
Usage:
set_time_limit (number of seconds);
stipulates that the program must run and end within the specified number of seconds from the time this sentence is run.
If the timeout expires, the program will exit with an error.

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