php date Detailed explanation of PHP date function parameters

time() in PHP gets a number, which represents the total number of seconds since 1970-01-01. It’s strange, right? But it’s easy to calculate.
To find out the time of the previous day, just use time()- 60*60*24;
To find out the time in the previous year is time()*60*60*24*365
So how to change this number into date format, you need to use the date function
$t= time();
echo date("Y-m-d H:i:s",$t);
The format of the first parameter represents:
a - "am" or "pm"
A - "AM" or "PM"
d - day, two digits, if there are less than two digits, add zeros in front; such as: "01" to "31"
D - day of the week, three English letters; such as: "Fri"
F - Month, full English name; such as: "January"
h - hour in 12-hour system; such as: "01" to "12"
H - hour in 24-hour system; such as: "00" to "23"
g - For hours in the 12-hour system, zeros are not added if there are less than two digits; such as: "1" to 12"
G - For hours in the 24-hour system, zeros are not added if there are less than two digits; such as: "0" to "23"
i - minutes ; For example: "00" to "59"
j - Day, two digits, if there are less than two digits, do not add zero; For example: "1" to "31"
l - Day of the week, full English name; For example: " Friday"
m - month, two digits, if there are less than two digits, add zeros in front; such as: "01" to "12"
n - month, two digits, if there are less than two digits, do not add zeros; such as: "1" to "12"
M - month, three English letters; such as: "Jan"
s - seconds; such as: "00" to "59"
S - add an English ordinal at the end of the word, two English letters; Such as: "th", "nd"
t - the number of days in the specified month; such as: "28" to "31"
U - the total number of seconds
w - the numeric day of the week, such as: "0" (Sunday) to "6" (Saturday)
Y - year, four digits; such as: "1999"
y - year, two digits; such as: "99"
z - day of the year; such as: "0" To "365"
Other characters not listed above will be listed directly.
The above introduces the detailed explanation of php date PHP date function parameters, including the content of php date. I hope it will be helpful to friends who are interested in PHP tutorials.