PHP Time and date operation combat _php skills

Commonly used time functions:
1.time (); The total number of seconds from 1970/1/1 00:00:00 to today

<?echo time ();? >
2.mktime (); Set time

<?echo date ("U", Mktime (0,0,0,1,20,2011));/Output January 1, 1970 0:0 0 seconds to January 20, 2011 0:0 0 seconds Total seconds//mktime parameters: Mktime (time, minutes, seconds, months, days) , years);//often combined with date ("U", Mktime (time, minute, second, month, day, year));? >
3.date (); More information on getting time

<?echo date ("y-m-d h:i:s")//Output year-month-day: minutes: seconds;//Fill parameters Please refer to the table below; >

represents a String	Description	Example	Output
Years:
Y	Siyuanyan (4-bit)	<?=date ("Y")?>	2011
Y	Siyuanyan (2-bit)	<?=date ("Y")?>	11
Month:
M	month, less than two-digit supplement 0 (01~12)	<?=date ("M")?>	01
N	month, less than two digits not complement 0 (1~12)	<?=date ("n")?>	1
T	A total of several days this month (1~31)	<?=date ("T")?>	31
M	English month name (abbreviation)	<?=date ("M")?>	A few.
F	English month name (full name)	<?=date ("F")?>	January
Day:
D	Date, less than two-digit complement 0 (01~31)	<?=date ("D")?>	01
J	Date, less than two digits not complement 0 (01~31)	<?=date ("J")?>	1
Week:
W	The week of the numeral type, (with 0~6 represents one to day)	<?=date ("W")?>	0
D	Week name (abbreviation)	<?=date ("D")?>	Sun
L	Weekday name (full name)	<?=date ("L")?>	Sunday
When
H	24 o'clock hours, less than two-digit supplement 0 (00~23)	<?=date ("H")?>	07
G	24 o'clock hours, less than two-digit 0 (0~23)	<?=date ("G")?>	7
H	12 o'clock hours, less than two-digit supplement 0 (01~12)	<?=date ("H")?>	07
G	12 o'clock hours, less than two-digit 0 (1~12)	<?=date ("G")?>	7
Part
I	Minutes, less than two-digit complement 0 (00~59)	<?=date ("I")?>	40
Seconds:
S	seconds, less than two-digit complement 0 (00~59)	<?=date ("s")?>	45
S	seconds, less than two bits complement 0 (00~59) plus English order	<?=date ("S")?>	45th
Last afternoon:
A	Capital AM/PM	<?=date ("A")?>	Am
A	lowercase am/pm	<?=date ("a")?>	Am
Other:
U	1970/1/1 00:00:00 to the total number of seconds of the specified day	<?=date ("U")?>	1156780800
Z	The first day of the Year (0~365)	<?=date ("z")?>	255

* Red Bottom represents the commonly used parameters

Some common uses:
1. Get January 1, 1970 0 hours 0 minutes 0 seconds to today's total seconds:

Copy Code code as follows:

?
echo Date ("U", Mktime (0,0,0,date ("Y"), Date ("M"), Date ("D"));
?>

2. Get the total number of seconds from today to the previous 7 days:

Copy Code code as follows:

.
$setTime = Date ("U", Mktime (0,0,0,7,20,2011));
$time = Date ("U", Mktime (0,0,0,date ("M"), Date ("D"), Date ("Y"));
$start = $time -86400*7;
$over = $time +86400*7;
if ($start >= $time && $time <= $over)
{
echo Specifies the time in the 7 days before today ";
}
Else
{
echo "specifies that the time is over 7 days before today";
}
?>