Time and date in PHP

A, date () function

string Date (string $format [, int $timestamp])
Function: Formats the timestamp as an easy-to-read time and date.

Parameters	Description
Format	Necessary. Specifies the format of the timestamp.
Timestamp	Optional. Time stamp is specified. The default is the current time and date.

1. Date of acquisition (1), year

format Formats	Description	Example
L	Whether it is a leap year	If the leap year is 1, otherwise 0
O	ISO-8601 format year number. This is the same value as Y, except if the day of the Week (W) of the ISO belongs to the previous year or the next year. (PHP 5.1.0 new addition)	examples:1999 or 2003
Y	4-digit year in full representation	Example: 1999 or 2003
Y	Year 2-digit representation	Example: 99 or 03

(2), month

format Formats	Description	Example
F	month, full text format, such as January or March	January to December
M	A number represents the month, with a leading zero	01 to 12
M	Three letter abbreviation for month	Jan to Dec
N	The number represents the month, without leading zeros	1 to 12
T	The number of days that a given month should be	28 to 31

(3), Japan

format Formats	Description	Example
D	The day ordinal of a month with a leading zero 2-digit number	01 to 31
D	Day of the week, text representation, 3 letters	Mon to Sun
J	The day ordinal of the month without leading zeros	1 to 31
L (Lowercase letter of "L")	Day of the week, full text format	Sunday to Saturday
N	ISO-8601 format number represents the day of the week (PHP 5.1.0 new Plus)	1 (for Monday) to 7 (= Sunday)
S	English suffix, 2 characters, after the number of days per month	st,nd,rd or th. Can be used with J.
W	Day of the week, numbers indicate	0 (for Sunday) to 6 (= Saturday)
Z	The day ordinal of the year	0 to 365

(4), week

format Formats	Description	Example
W	Week of the ISO-8601 format year, starting from Monday (PHP 4.1.0 New)	Example: 42 (42nd Week of the year)

2. Acquisition time (1), Time td> hours, 12-hour format, no leading 0

format format	description	example
a< /td>	lowercase morning and afternoon values	am or PM
A	uppercase morning and afternoon values	am or PM
B	Swatch Internet standards	000 to 999
g	1 to
G	hours, 24-hour format, no preamble 0	0 to 23
h	hours, 12-hour format, with leading 0	01 to +
h	Small 24-hour format with leading 0	00 to all
i	number of minutes with leading zeros	00 to 59>
S	number of seconds, with leading 0	00 to 59>
u	ms (PHP 5.2). 2 new Plus). It is important to note that the date () function always returns 000000 because it accepts only the integer parameter, and Datetime::format () supports milliseconds.	Example: 654321

(2), Time zone

format Formats	Description	Example
E	Time zone ID (PHP 5.1.0 new addition)	Example: Utc,gmt,atlantic/azores
I	Whether it is daylight saving time	If daylight saving time is 1, otherwise 0
O	Hours of difference from GMT	Example: +0200
P	Difference from GMT (GMT), between hours and minutes colon separated (PHP 5.1.3 New)	Example: +02:00
T	The time zone in which this machine resides	For example: EST,MDT ("translator note" in the full text format under Windows, such as "Eastern Standard Time", the Chinese version will show "China normal times").
Z	The number of seconds of the slack offset. The time zone offset in the west of UTC is always negative, and the time zone offset to the east of UTC is always positive.	43200 to 43200

Second, mktime () function

mktime (hour,minute,second,month,day,year)
Function: Returns the UNIX timestamp according to the given parameters.
The timestamp is a long integer containing the number of seconds from the Unix era (January 1 1970 00:00:00 GMT) to a given time.

Three, strtotime () function

int Strtotime (string $time [, int $now = time ()])
function: Resolves a datetime description of any English text to a Unix timestamp
Time: DateTime string. The correct format is described in the date and time format.
Now: the timestamp used to calculate the return value.

Note: Modify the time zone to get local time

1. Modify the date.timezone field in the php.ini file
   Remove the preceding semicolon, add the PRC (Beijing time), and restart the Appache
2. Initialize time in code date_default_timezone_set (XXX)
3. In addition: About XXX, the values available in mainland China are: asia/chongqing, Asia/shanghai, Asia/urumqi (Chongqing, Shanghai, Urumqi, respectively)
   Taiwan available: Asia/macao, Asia/hong_kong, Asia/taipei (Macao, Hong Kong, Taipei, respectively). and Singapore: Asia/singapore.
   Other available values are: Etc/gmt-8, Singapore, Hongkong, PRC

Iv. a simple calendar that I did after I finished this study:

<html><head><!--<meta http-equiv= "Refresh" content= "3" >--></head><body><table cellpadding="Ten"><tr><TD>Sun</td><TD>Mon</td><TD>Tue</td><TD>Wed</td><TD>Thu</td><TD>Fri</td><TD>Sat</td></tr><?php#显示一张日历$SATNUM=0;$MONTH=date ("M");Echo "<tr>"; for($i=0;$i<date ("W", Strtotime ("2015/$MONTH/01"));$i++){Echo "<td></td>";} for($j=0,$i=date ("W", Strtotime ("2015/$MONTH/01"));$i<=6;$i++,$j++){$tmp= on+$j;$GLOBALS[' Satnum ']=$tmp;Echo "<td> $tmp </td>";}Echo "</tr>"; for($j=0;$j<4;$j++){Echo "<tr>"; for($i=0;$i<7;$i++){$tmp=++$GLOBALS[' Satnum '];if($tmp==date ("D"))Echo "<td bgcolor=blue> $tmp </td>";ElseIf(! ($tmp>date ("T")))Echo "<td> $tmp </td>"; }Echo "</tr>";}?><?php #确定星期几$week="";Switch(Date ("W")){ Case 0:$week="Sunday"; Break; Case 1:$week="Monday"; Break; Case 2:$week="Tuesday"; Break; Case 3:$week="Wednesday"; Break; Case 4:$week="Thursday"; Break; Case 5:$week="Friday"; Break; Case 6:$week="Saturday"; Break;}#动态显示当前时间Echo "The time is now:". Date ("Y year M D Day $week H I min s second");Echo "<br/>";?></body></html>

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Time and date in PHP