Detailed explanation of parameters of date function in php

time() gets a number in PHP. This number indicates how many seconds have passed since 1970-01-01. It’s very strange.
But This is convenient for calculation.

To find the time of the previous day is time()-60*60*24;
To find the time of the previous year is time()*60*60*24* 365

So how to change this number into date format, you have to use the datefunction

 $t=time(); 
 echo date("Y-m-d H:i:s",$t);

The first one The format of the parameters respectively indicates:
a - "am" or "pm"
A - "AM" or "PM"
d - Day, two digits, if there are less than two digits, the first Fill in zeros; 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 - Hours in 12-hour format; such as: "01" to "12"
H - Hours in 24-hour format; such as: "00" to "23"
g - Hours in 12-hour format, less than two digits Do not add zeros; such as: "1" to 12"
G - Hours in the 24-hour system, do not add zeros if there are less than two digits; such as: "0" to "23"
i - Minutes; such as: "00 " to "59"
j - Day, two digits, if there are less than two digits, do not add zero; such as: "1" to "31"
l - Day of the week, full English name; such as: "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, no zeros will be added ; Such as: "1" to "12"
M - month, three English letters; such as: "Jan"
s - seconds; such as: "00" to "59"
S - suffix Add an English ordinal number, 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 - 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 - The day of the year; such as: "0" to "365"
Other characters not listed above will be listed directly

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